642 |
Pietra del Vesuvio, from Mt. Vesuvius, Naples, Campania, Italy |
Ignimbrite. A devitrified welded rock containing megacrysts of simple and lamellar-twinned feldspars, smaller crystals of ferromagnesian minerals, and fine-grained rounded clasts. The compression of the shards is evident in the side of the specimen. |
643 |
Pietra del Vesuvio, from Mt. Vesuvius, Naples, Campania, Italy |
Ignimbrite. A devitrified welded rock containing megacrysts of simple and lamellar-twinned feldspars, smaller crystals of ferromagnesian minerals, and fine-grained rounded clasts. The compression of the shards is evident in the side of the specimen. |
644 |
Pietra del Vesuvio, from Mt. Vesuvius, Naples, Campania, Italy |
Olivine basalt/ankaramite. An altered porphyritic basic volcanic/dyke rock with phenocrysts of subhedral to euhedral pyroxene, olivine, and plagioclase. Calcite fills the amygdales. |
645 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
Altered pumice breccia. Poorly sorted, with clasts up to 50mm, having rounded, carbonate-infilled vesicles. |
646 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
Altered volcanic breccia with a central pale grey fine-grained zone. The large rounded clasts are ferromagnesian-rich volcanic rock, one having a higher feldspar content. The fine-grained zone has a medium-grained leucocratic carbonate-rich core. |
647 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
Marble breccia. A low-density breccia with angular clasts of meta-carbonate, and hematite-filled veins. Much of the brown is filler. |
648 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
Ignimbrite. A poorly sorted breccia with clasts of rusty-coloured medium grained crystalline rock, discrete crystals of altered feldspar, and ferromagnesian minerals, all in a very fine-grained hematite-bearing groundmass. There is a faint preferred orientation of the clasts. |
649 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
Trachyandesite/trachyte. A pale grey porphyritic vocanic or dyke rock with subhedral laths of feldspar showing some alignment, set in a groundmass of feldspar and minor ferromagnesian minerals. |
650 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
An altered crystal-rich ignimbrite. Amygdaloidal microporphyritic rock clasts with altered subhedral phenocrysts of a ferromagnesian mineral and feldspar, are set in very fine-grained dark matrix. Amygdales are rounded or irregular in shape, and many contain carbonate infills which have a banded agate-like appearance. The streaky appearance of paler patches suggests a flattened shard structure. |
651 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
An altered pumice flow breccia. Coarse breccia with clasts of red vesicular rock in pale carbonate matrix. The vesicles are carbonate-filled. |
652 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
An altered ignimbrite. A poorly sorted breccia with clasts of rusty-brown medium-grained crystalline rock, discrete crystals of altered feldspar, and ferromagnesian minerals, all in a very fine-grained hematite-bearing groundmass. A faint preferred orientation of the clasts is evident. |
653 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
An intermediate volcanic rock with abundant phenocrysts of feldspar and sparse pyroxene crystals set in very fine grained grey matrix. The feldspars are strongly aligned. They are probably plagioclase, and so the rock may be a porphyritic andesite. |
654 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
An altered pumiceous tuff. Brick-red, carbonate-bearing medium to fine-grained, well-sorted rock with a few larger subangular pumice clasts. No. 656 may be this rock in an unaltered state. |
655 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
Olivine basalt/trachybasalt. Dark grey porphyritic lava with phenocrysts of plagioclase, olivine and pyroxene (all variably altered) in a fine-grained equigranular matrix. Rounded vesicles have zoned infills of hematite and calcite. |
656 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
Tuff. Moderately sorted coarse-grained dark crystal-rich ash with rounded grains of plagioclase, pyroxene, olivine, and rarer grains of an opaque oxide mineral. It has an overall basaltic composition, and may be the unaltered equivalent of no. 654. |
657 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
Ignimbrite. A streaky-textured volcaniclastic rock containing carbonate minerals. It has crystals and crystal clusters of feldspar, pyroxene, opaque mineral, and possibly altered olivine. Half of the specimen has a faint shard structure and possibly some flattened pumice clasts. |
658 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
Basaltic crystal tuff. A dark grey compact well-sorted rock comprising principally plagioclase with minor subhedral crystals of dark green pyroxene and rare partially altered olivine. |
659 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
Volcanic breccia with sub-angular clasts of altered fine-grained basic rock and some of vesicular rock. Vesicles have carbonate infills, and some are surrounded by reaction rims which perhaps indicates magma mixing. The streaky texture suggests some plastic deformation. |
660 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
Tuff or basic lava. A dull red, equigranular rock composed principally of pale pink stained feldspar set in very fine dark matrix, with occasional pyroxenes up to 10mm.
It has amygdales containing zoned carbonate and red oxide.
|
661 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
A porphyritic trachyte, consisting of rounded or stubby white feldspars, glassy laths of plagioclase showing alignment, and subhedral elongate crystals of pyroxene. |
662 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
Mixed rock, possibly from a junction of intermediate and basic magmas. Patches of paler grey microporphyritic rock consisting of feldspars and sub-aligned euhedral pyroxene crystals. These have diffusion rims (containing carbonate) at contacts with the dark streaky-textured coarser rock, which contains larger crystals of feldspar and pyroxene. |
663 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
Tephrite. A porphyritic rock with euhedral white megacrysts of leucite and subhedral dark green megacrysts of alkali pyroxene, in a very fine-grained groundmass of feldspar and ?feldspathoid set in pale brown matrix. A few yellow ?olivines are visible. |
664 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
Altered (?phonolitic) tephrite. A porphyritic rock with prominent euhedral megacrysts of black pyroxene, and with an altered euhedral pale mineral forming less obvious phenocrysts. The groundmass is very fine-grained, fawn-coloured, and of indeterminate mineralogy. This sample has some similarities with no. 665 but is lighter in colour, possibly because of alteration. |
665 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
Altered (?phonolitic) tephrite. It is brecciated, but similar in mineralogy to no. 664. Prominent black pyroxenes occur within and separated from the clasts. These also contain a strongly altered felsic mineral. The matrix is white carbonate, but the lack of rounding of pyroxenes suggests that it has infiltrated the rock, and not entered as a result of fracturing and movement. |
666 |
Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy |
Altered (?phonolitic) tephrite. A porphyritic rock with carbonate-replaced feldspathoid crystals. Smaller subhedral crystals after pyroxene speckle the groundmass, which is rich in white carbonate and pink felsic material. |
881 |
Pietra di Malanaggio, from Malanaggio, Val Chisone, Piedmont, Italy |
Grey medium-grained foliated meta-granodiorite with aligned brownish altered amphibole. |
886 |
Pietra di Malanaggio, from Malanaggio, Val Chisone, Piedmont, Italy |
A foliated, recrystallised medium-grained meta-granodiorite. |
671 |
Pietra di paragone, Lydian stone, locality unknown |
Ignimbrite. This fine-grained rock with a streaky texture has occasional crystals of feldspar and a ferromagnesian mineral. It is densely welded. |
522 |
Pietra felce dell'Elba, pietra paesina, from the island of Elba, Livorno, Tuscany, |
Micritic limestone or calcareous marl showing minor fracture constrained iron-staining giving faint paesina effect. It has abundant areas of dendritic manganese oxides. |
508 |
Pietra paesina, from Civitavecchia, Rome, Lazio, Italy |
Micritic limestone or calcareous marl from the Cretaceous-Eocene Alberese Formation. Calcite-filled microfractures control iron-staining. Some dendritic manganese oxides emanate from the fractures. |
528 |
Pietra paesina, from Civitavecchia, Rome, Lazio, Italy |
Micritic limestone or calcareous marl from the Cretaceous-Eocene Alberese Formation. Calcite-filled microfractures control iron-staining, giving the 'paesina' effect. Minor dendritic manganese oxides emanate from the fractures. |
533 |
Pietra paesina, from Civitavecchia, Rome, Lazio, Italy |
Micritic limestone or calcareous marl from the Cretaceous-Eocene Alberese Formation. Liesegang rings of iron-staining colour the specimen. |
534 |
Pietra paesina, from Civitavecchia, Rome, Lazio, Italy |
Micritic limestone or calcareous marl from the Cretaceous-Eocene Alberese Formation. Brown ferruginous calcite or siderite-filled veins cut the specimen and there is some pink coloration constrained by calcite-filled microfractures giving a faint 'paesina' effect. |
958 |
Pietra paesina, from Civitavecchia, Rome, Lazio, Italy |
Heavily fractured micritic limestone with abundant tiny bioclasts, stylolites and orange and white sparry calcite-filled fractures. Ferruginous staining is constrained by sealed microfractures giving the 'paesina' effect. There are minor dendrites of manganese oxides. It is almost certainly from the Cretaceous to Eocene Alberese Formation. |
959 |
Pietra paesina, from Civitavecchia, Rome, Lazio, Italy |
Heavily fractured micritic limestone with sparry calcite-filled fractures and stylolites. Ferruginous staining is constrained by the fractures giving the 'paesina' effect. It is almost certainly from the Cretaceous to Eocene Alberese Formation. |
960 |
Pietra paesina, from Civitavecchia, Rome, Lazio, Italy |
Heavily fractured micritic limestone with sparry calcite-filled fractures. Ferruginous staining is constrained by the fractures and shows banded Liesegang rings, together giving the 'paesina' effect. It is almost certainly from the Cretaceous to Eocene Alberese Formation. |
510 |
Pietra paesina, from Florence, Tuscany, Italy; and most probably from the Valdarno |
Calcareous marl/marly limestone from the Upper Cretaceous Alberese Formation. Calcite-filled microfractures control extent of iron/manganese colouration. Note the prominent stylolites. |
507 |
Pietra paesina, from Florence, Tuscany, Italy; and most probably from Valdarno |
Micritic limestone or calcareous marl from the Cretaceous Alberese Formation, with red hematitic specks and stylolites. Calcite-filled microfractures control iron-staining. Some dendritic Mn oxides emanate from the fractures. |
519 |
Pietra paesina, from the province of Naples, Campania, Italy |
Micritic limestone or calcareous marl. Calcite-filled microfractures control iron-staining which together with Liesegang rings of colour, gives the 'paesina' effect. Some dendritic manganese oxides are evident. |
957 |
Pietra paesina, from Trent, Trentino-Alto Adige, Italy |
Heavily fractured micritic limestone with abundant tiny bioclasts. Ferruginous staining shows typical Liesegang rings, and is constrained by sealed microfractures giving the 'paesina' effect seen best on sides of sample. Dendritic manganese oxides emanate from fractures. It is almost certainly from the Cretaceous to Eocene Alberese Formation. |
956 |
Pietra paesina, from Tuscany, Italy |
Micritic limestone with scattered tiny bioclasts, coarser-grained intraclasts, and stylolites. It is heavily fractured, the microfracture-constrained iron-staining giving a 'paesina' effect. Abundant dentritic manganese oxides are concentrated in, or emanate from some intraclasts, stylolites and veins. It is almost certainly from the Cretaceous to Eocene Alberese Formation. |
523 |
Pietra paesina, from Valdarno, Florence, Tuscany, Italy |
Micritic limestone or calcareous marl from the Cretaceous Alberese Formation, showing minor fracture constrained iron-staining, and areas of dendritic manganese oxides. |
529 |
Pietra paesina, from Valdarno, Florence, Tuscany, Italy |
Micritic limestone or calcareous marl from the Cretaceous Alberese Formation. Calcite-filled microfractures control iron-staining. Some dendritic Mn oxides emanate from the fractures. |
530 |
Pietra paesina, from Valdarno, Florence, Tuscany, Italy |
Micritic limestone or calcareous marl from the Cretaceous Alberese Formation. Calcite-filled microfractures control iron-staining. Some dendritic Mn oxides emanate from the fractures. |
531 |
Pietra paesina, from Valdarno, Florence, Tuscany, Italy |
Micritic limestone or calcareous marl from the Cretaceous Alberese Formation. Calcite-filled microfractures control iron-staining. It is cut by a large calcite-filled vein. |
532 |
Pietra paesina, from Valdarno, Florence, Tuscany, Italy |
Micritic limestone or calcareous marl from the Cretaceous Alberese Formation. It is heavily iron-stained, the coloration constrained by abundant calcite-filled microfractures. Manganese oxide dendrite are also abundant. |
941 |
Pietra perlea di Trento, from Trent, Trentino-Alto Adige, Italy |
Massive coarsely crystalline calcite with iridescence off incipient cleavages. Reddish brown in places, ferruginous matter coating some incipient cleavage planes. |
257 |
Pietra Rosone di Trapani, from Trapani, Sicily, Italy |
Limestone. The matrix is fine-grained microspar crowded with bioclasts of benthic forams, molluscs, bryozoans, echinoderms, calcareous algae etc. It contains abundant silicate grains, as well as larger fossils and calcareous algae. |
553 |
Pietra rota degli Appennini, from the Apennines, Italy |
Quartzite with limonitic cement. |
458 |
Pomarolo di Serme, from Serme, Verona, Veneto, Italy |
Brecciated limestone with red, non-calcareous (perhaps lateritic) matrix. |
430 |
Pomorol di S.Giorgio, from San Giorgio, Verona, Veneto, Italy |
Brecciated, stylolitised, biomicrite limestone with scattered intraclasts. |
43 |
Pomorolo di Mizzolle, from Mizolle, Val Pantena, Verona, Veneto, Italy |
Brecciated fine-grained limestone crowded with rhombohedral microcrystals of calcite. It has prominent stylolites. Dark brown areas are wax filler. |
794 |
Porfido del'Elba, from the island of Elba, Livorno, Tuscany, Italy |
Porphyritic andesite or trachyandesite. Subhedral phenocrysts of plagioclase and pyroxene in fine-grained reddish-brown groundmass, possibly devitrified glass. Curved alignment of crystals indicates viscous flow. |
811 |
Porfido delle Alpi, from the Alps |
Porphyry with large phenocrysts of white plagioclase feldspar. |
983 |
Porfido delle Alpi, from the Alps |
Quartz porphyry. Pale reddish brown rock. Subhedral phenocrysts of glassy quartz up to 3mm and pale brown alkali feldspar set in very fine-grained pale brown groundmass with occasional ferromagnesian silicate mineral and black oxide. |
984 |
Porfido delle Alpi, from the Alps |
Quartz porphyry. Greyish brown colour. Prominent white subhedral feldspar phenocrysts, some showing compositional zoning with lamellar-twinned interiors and untwined rims. Rounded glassy quartz phenocrysts and prismatic dark brown ferromagnesian mineral, probably amphibole. All set in very fine-grained pale brown
groundmass. Similar in mineralogy to 0983, but with different proportions of feldspar and quartz phenocrysts.
|
812 |
Porfido delle Alpi, from the Alps; or perhaps from the island of Elba, Livorno, Tuscany, Italy |
A microgabbro with a gabbro pegmatite containing large phenocrysts of white plagioclase feldspar. Altered, the pyroxene crystals are probably 'uralitised' to amphibole. |
810 |
Porfido di Cecina, from Cecina, Livorno, Tuscany, Italy |
Porphyritic andesite. Subhedral phenocrysts up to 20mm of zoned plagioclase in dark grey groundmass of plagioclase, pyroxene and ?amphibole. Minor micaceous veining. |
791 |
Porfido di Corsica, from Corsica, France |
Altered amygdaloidal porphyritic olivine basalt. Pseudomorphed euhedral phenocrysts of olivine and subhedral pyroxene are set in a dark grey fine-grained groundmass of pyroxene, olivine and feldspar. Olivine pseudomorphs contain dark oxide and carbonate. Amygdales have infillings of carbonate and silicate minerals, and many have reaction zones against groundmass in which the latter is lighter-coloured and coarser-grained. |
152 |
Porfido di Sardegna, from Sardinia, Italy |
Calcite marble with scattered large crystals of calcite in a fine-grained groundmass coloured grey by minute grains of ?graphite. Any brown coloration is polishing compound filling cavities where the large grains have fallen out. |
985 |
Porfido di Siberia, from Siberia, Russia |
Plagiophyric micro-diorite. Laths of white plagioclase, frequently in clusters, and dark green subhedral amphibole set in fine-grained matrix of probably similar mineralogy. |
806 |
Porfido serpentino antico, porfido verde agatata, from Krokees (Levetsova), Laconia, Peloponnese, Greece |
Porphyritic andesite of Permian to Carboniferous age, weakly metamorphosed and coloured green by epidote and other iron silicates. The phenocrysts are plagioclase feldspar, and vesicles are filled with cryptocrystalline quartz (chalcedony). |
802 |
Porfido serpentino antico, porfido verde risato, from Krokees (Levetsova), Laconia, Peloponnese, Greece |
Porphyritic andesite of Permian to Carboniferous age, weakly metamorphosed and coloured green by epidote and other iron silicates. It has small phenocrysts of plagioclase feldspar. |
805 |
Porfido serpentino antico, porfido Vitelli, from Krokees (Levetsova), Laconia, Peloponnese, Greece |
Porphyritic andesite of Permian to Carboniferous age, weakly metamorphosed and coloured green by epidote and other iron silicates. The phenocrysts are plagioclase feldspar. |
797 |
Porfido serpentino antico, from Krokees (Levetsova), Laconia, Peloponnese, Greece |
Porphyritic andesite of Permian to Carboniferous age, weakly metamorphosed and coloured green by epidote and other iron silicates. The phenocrysts are plagioclase feldspar. |
798 |
Porfido serpentino antico, from Krokees (Levetsova), Laconia, Peloponnese, Greece |
Porphyritic andesite of Permian to Carboniferous age, weakly metamorphosed and coloured green by epidote and other iron silicates. The phenocrysts are plagioclase feldspar. |
799 |
Porfido serpentino antico, from Krokees (Levetsova), Laconia, Peloponnese, Greece |
Porphyritic andesite of Permian to Carboniferous age, weakly metamorphosed and coloured green by epidote and other iron silicates. The phenocrysts are plagioclase feldspar. |
800 |
Porfido serpentino antico, from Krokees (Levetsova), Laconia, Peloponnese, Greece |
Porphyritic andesite of Permian to Carboniferous age, weakly metamorphosed and coloured green by epidote and other iron silicates. The phenocrysts are plagioclase feldspar. |
801 |
Porfido serpentino antico, from Krokees (Levetsova), Laconia, Peloponnese, Greece |
Porphyritic andesite of Permian to Carboniferous age, weakly metamorphosed and coloured green by epidote and other iron silicates. The phenocrysts are plagioclase feldspar. |
803 |
Porfido serpentino antico, from Krokees (Levetsova), Laconia, Peloponnese, Greece |
Porphyritic andesite of Permian to Carboniferous age, weakly metamorphosed and coloured green by epidote and other iron silicates. The phenocrysts are plagioclase feldspar. |
804 |
Porfido serpentino antico, from Krokees (Levetsova), Laconia, Peloponnese, Greece |
Porphyritic andesite of Permian to Carboniferous age, weakly metamorphosed and coloured green by epidote and other iron silicates. The phenocrysts are plagioclase feldspar. |
967 |
Porfido serpentino antico, from Krokees (Levetsova), Laconia, Peloponnese, Greece |
Deformed porphyritic microdiorite (plagioclase-biotite?), feldspar replaced by aggregates of epidote. There is primary sub-parallel orientation of the porphyroblasts of replaced feldspars. |
809 |
Porfido serpentino nero, from Wadi Umm Towat, near Gebel Dokhan, Eastern Desert, Egypt |
Trachyandesite porphyry with white phenocrysts of plagioclase feldspar. |
790 |
Porfido Trentino, porfido Atesino, from Bolzano area, Trentino-Alto Adige, Italy |
Pophyritic rhyolite with phenocrysts of quartz, feldspar and biotite. |
63 |
Porporina di villa Adriana, locality unknown |
Hematite-rich banded limestone with some colourless sparry calcite-filled veins, and abundant cavities which are filled with wax on polished surfaces. Probably extensively recrystallised. |
77 |
Portasanta, from north west of Chora, Island of Chíos, North Aegean, Greece |
Large clasts of pale pink compact fine-grained limestone showing a reticulated network of stylolites. It is part of a breccia, and small areas of salmon-pink micritic matrix can be seen. |
78 |
Portasanta, from northwest of Chora, Island of Chíos, North Aegean, Greece |
Fine-grained compact limestone breccia. Heavily fractured, the later fractures are filled with white calcite. Some mollusc shell fragments are present. |
79 |
Portasanta, from northwest of Chora, Island of Chíos, North Aegean, Greece |
Fine-grained compact limestone, partially recrystallised. Abundant stylolites containing red iron oxides give a reticulated (net-like) appearance. |
80 |
Portasanta, from northwest of Chora, Island of Chíos, North Aegean, Greece |
Partially recrystallised fine-grained compact limestone. Red and yellow iron oxides are concentrated in abundant stylolites, giving a reticulated (net-like) appearance. |
81 |
Portasanta, from northwest of Chora, Island of Chíos, North Aegean, Greece |
Fine-grained compact limestone, partially recrystallised, with abundant stylolites. |
82 |
Portasanta, from northwest of Chora, Island of Chíos, North Aegean, Greece |
A breccia of pink micritic limestone clasts with intraclasts of a pink/grey breccia. A little dark red-brown hematitic matrix is visible in a few places. Abundant stylolites cross the stone and later fractures are filled with white calcite. White lines are scratches. |
84 |
Portasanta, from northwest of Chora, Island of Chíos, North Aegean, Greece |
Breccia of poorly-sorted fine-grained pink and cream-coloured limestone clasts in a dark red hematite-bearing micritic matrix. The limestone clasts have a few bioclasts and stylolites. Late stage white calcite-filled fractures cross the specimen. |
87 |
Portasanta, from northwest of Chora, Island of Chíos, North Aegean, Greece |
Limestone breccia. The clasts are pink micritic limestone with pink/grey intraclasts. The matrix is dark red-brown, hematitic. Abundant stylolites cross the stone and later fractures are filled with white calcite. |
88 |
Portasanta, from northwest of Chora, Island of Chíos, North Aegean, Greece |
White limestone with relics of bioclasts, spar filled veins and a few yellowish iron oxide-stained veins and stylolites. It is likely to be part of a large clast from a breccia. |
193 |
Portasanta, from northwest of Chora, Island of Chíos, North Aegean, Greece |
Fine-grained compact limestone breccia with stylolites and stylolitic clast boundaries. Some relic shell fragments are evident. Fractures are filled with white calcite. |
904 |
Portasanta, from northwest of Chora, Island of Chíos, North Aegean, Greece |
Fine-grained compact limestone, partially recrystallised, with red iron oxides concentrated in abundant stylolites giving a characteristic reticulated appearance often seen in this stone. |
905 |
Portasanta, from northwest of Chora, Island of Chíos, North Aegean, Greece |
Fine-grained compact limestone breccia of pink clasts. There are abundant stylolites, and later fractures are filled with white calcite. |
906 |
Portasanta, from northwest of Chora, Island of Chíos, North Aegean, Greece |
Partially recrystallised bioclastic limestone with crinoid and other debris, stylolites, and spar-filled fractures. |
908 |
Portasanta, from northwest of Chora, Island of Chíos, North Aegean, Greece |
Fine-grained recrystallised limestone with stylolites and spar-filled fractures. |
133 |
Portoro, from Portovenere, Liguria, Italy |
Black fine-grained weakly metamorphosed limestone with thin white calcite-filled veins, and with stylolites, sinuous wider veins and pods of calcite coloured yellow by included goethite. |
134 |
Portoro, from Portovenere, Liguria, Italy |
Breccia of black fine-grained weakly metamorphosed limestone with thin white calcite-filled veins, in a matrix of granular calcite coloured yellow by included goethite. Yellow stylolites are also prominent. |
135 |
Portoro, from Portovenere, Liguria, Italy |
Black fine-grained weakly metamorphosed limestone with thin white calcite-filled veins, and with stylolites, and a few sinuous wider veins of calcite coloured yellow by included goethite. |
681 |
Pudingo antico, locality unknown |
Poorly sorted synsedimentary breccia/conglomerate. Red clasts are chert, containing igneous grains. |
682 |
Pudingo antico, locality unknown |
Polymict conglomerate with clasts of quartz, chert, silicified limestone, and dolomitic limestone. The matrix is calcareous. |
698 |
Pudingo delle Alpi, from the Alps |
Well-sorted quartz conglomerate with subsidiary lithic clasts. |
699 |
Pudingo delle Alpi, from the Alps |
Lithic breccia-conglomerate with siliceous clasts. |
972 |
Pudingo delle Alpi, from the Alps |
Polymict conglomerate with sandstone matrix, clasts: limestone, marble? rock. Fragments possibly volcanic? Some chalcedony. Scattered bivalves and gastropods in the matrix - ?marine |
970 |
Pudingo di Sabina, from Sabina, Umbria, Italy |
Polymict conglomerate. Clasts predominantly limestone, but include some silicates including muscovite; a few clasts are pebbles of igneous/metamorphic rocks (granite/gneiss etc.). Matrix is calcarenite with some quartz, coated with yellowish goethite. |
971 |
Pudingo di Toscana, from Tuscany, Italy |
Polymict breccio-conglomerate, clasts are largely quartz or chert, and some have inclusions of pyrite. Matrix is calcarenite. |
707 |
Quartz chalcedony or more probably flint, locality unknown |
Quartz var. chalcedony, coloured by included iron silicates. |