Corsi Collection of Decorative Stones

Page 9 of 10, showing 801 - 900 of 1000 stones.
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OUMNH number Name and quarry location Geological description
OUMNH number Name and quarry location Geological description
968stone 968 almost certainly breccia del Taigeto, breccia verde di Sparta, from the area of Krokees (Levetsova), Laconia, Peloponnese, Greece Synsedimentary breccio-conglomerate with clasts of porphyritic andesite.
967stone 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.
797stone 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.
798stone 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.
799stone 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.
800stone 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.
801stone 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.
802stone 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.
803stone 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.
804stone 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.
805stone 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.
806stone 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).
810stone 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.
815stone 815 Granito bigio, granito bigio pediculare, from the area between Frejus and Dramont, Esterel Mountains, Var, France Porphyritic dacite, with phenocrysts of euhedral and larger white compositionally zoned plagioclase feldspars, and dark green to black hornblende.
826stone 826 Granito bigio, granito bigio pediculare, from the area between Frejus and Dramont, Esterel Mountains, Var, France Porphyritic dacite, with phenocrysts of elingate plagioclase crystals and green and black amphibole (augite and hornblende?).
817stone 817 Granito bigio, granito a morviglione, porfido bigio di Sibilio, from the area between Frejus and Dramont, Esterel Mountains, Var, France Porphyritic dacite, with large phenocrysts of white compositionally zoned plagioclase feldspars, and green-black zoned amphibole (altered hornblende), with a little biotite.
792stone 792 Granito bigio, granito a morviglione, from the area between Frejus and Dramont, Esterel Mountains, Var, France Porphyritic dacite, with phenocrysts of white compositionally zoned plagioclase feldspar and dark green to black hornblende.
793stone 793 Granito bigio, granito a morviglione, from the area between Frejus and Dramont, Esterel Mountains, Var, France Porphyritic dacite, with phenocrysts of white compositionally zoned plagioclase feldspar and dark green hornblende.
816stone 816 Granito bigio, granito a morviglione, from the area between Frejus and Dramont, Esterel Mountains, Var, France Porphyritic dacite, with phenocrysts of white-pink compositionally zoned plagioclase feldspars, black hornblende, and a few scattered quartz crystals.
887stone 887 Corsican granite, granito di Corsica, from Corsica, France Porphyritic microdiorite, probably plagioclase/biotite, over much of the specimen. Replacement of feldspar by aggregates of epidote is gradational in places, but sharp across a 1mm wide sheer zone or veinlet.
795stone 795 Swedish porphyry, from Älvdalen, Dalarna, Sweden Lamprophyre (minette group). Poikilocrysts of brown (?kaersutitic) amphibole up to 25mm enclosing subhedral crystals of pyroxene, feldspar and opaque mineral. Groundmass contains carbonate and possible feldspathoid.
785stone 785 Imperial porphyry, porfido bastardone, from Gebel Dokhan, Eastern Desert, Egypt Andesite-dacite porphyry; the 'bastardone' variety with white phenocrysts of plagioclase feldspar largely concentrated in scattered patches of brown groundmass. The purple colour of the greater part of this stone is due largely to trace piemontite, the manganese member of the epidote group, and indicates a degree of metamorphism.
796stone 796 most probably Lapis Iaracites, porfido verde Egiziano, from Gebel Dokhan, Eastern Desert, Egypt Andesite-dacite porphyry of white plagioclase phenocrysts in a grey-black groundmass. Very minor epidotisation of the plagioclase.
808stone 808 Imperial porphyry, porfido nero, from Gebel Dokhan, Eastern Desert, Egypt Andesite-dacite porphyry of white rectangular plagioclase phenocrysts in a dark grey groundmass.
788stone 788 Imperial porphyry, porfido nero, from Gebel Dokhan, Eastern Desert, Egypt Andesite-dacite porphyry of white plagioclase phenocrysts in a black groundmass.
787stone 787 Lapis ieracites, porfido verde egiziano, from Gebel Dokhan, Eastern Desert, Egypt Andesite-dacite porphyry of white plagioclase phenocrysts with epidotised rims in a greenish-black groundmass.
786stone 786 Imperial porphyry, porfido bigio, from Gebel Dokhan, Eastern Desert, Egypt Andesite-dacite porphyry; pink to white phenocrysts of plagioclase feldspar and black euhedral crystals of hornblende in a grey-brown groundmass.
783stone 783 Imperial porphyry, porfido rosso antico, from Gebel Dokhan, Eastern Desert, Egypt Andesite-dacite porphyry with pink phenocrysts of plagioclase feldspar. The purple colour is due largely to trace piemontite, the manganese member of the epidote group, and indicates a degree of metamorphism. It is from the Precambrian basement rocks.
784stone 784 Imperial porphyry, porfido rosso antico, from Gebel Dokhan, Eastern Desert, Egypt Andesite-dacite porphyry with patches of white phenocrysts of plagioclase feldspar. The purple colour is due largely to trace piemontite, the manganese member of the epidote group, indicating a degree of metamorphism. It is from the Precambrian basement rocks.
857stone 857 Granito di Corsica, from Corsica, France; or lapis sarcophagus, from Behram (the ancient Assos), Çanakkale Province, Turkey Probably a porphyritic andesite, with plagioclase feldspar and augite phenocrysts.
807stone 807 'Porfido serpentino antico', locality unknown Grey porphyry, perhaps a porphyritic diorite or granodiorite with phenocrysts of white plagioclase.
811stone 811 Porfido delle Alpi, from the Alps Porphyry with large phenocrysts of white plagioclase feldspar.
854stone 854 Granito dell'Elba, from the island of Elba, Livorno, Tuscany, Italy Megacrystic quartz porphyry. Megacrysts of white sub-euhedral feldspar with combined simple and lamellar twinning. Subhedral-rounded glassy quartz phenocrysts (and glomerocrysts) up to 10mm with pale lilac colour. Two feldspar groundmass, buff and white. Partially uralitised amphibole<5%. All set in pale greenish-grey fine-grained matrix.
789stone 789 probably porfido Trentino, from the Alps, and probably from the area of Bolzano, Trentino-Alto Adige, Italy Porphyritic rhyolite or dacite with phenocrysts of quartz, feldspar and biotite.
790stone 790 Porfido Trentino, porfido Atesino, from Bolzano area, Trentino-Alto Adige, Italy Pophyritic rhyolite with phenocrysts of quartz, feldspar and biotite.
809stone 809 Porfido serpentino nero, from Wadi Umm Towat, near Gebel Dokhan, Eastern Desert, Egypt Trachyandesite porphyry with white phenocrysts of plagioclase feldspar.
791stone 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.
985stone 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.
858stone 858 Corsican granite, granito di Corsica, from Corsica, France Pale grey quartz porphyry. White phenocrysts of feldspar with brownish alteration, glassy quartz and dark green uralitised amphibole in very fine-grained grey groundmass. Phenocrysts tend to form clusters.
794stone 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.
984stone 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.
983stone 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.
862stone 862 Granito delle Alpi, from the Alps Quartzite. Pale grey, equigranular. Minor feldspar interstitial haematitic staining.
671stone 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.
818stone 818 Granito bigio grafico, from Fontaine du Gènie, Tipaza, Algeria; or just possibly syenite della Balma, from Balma Biallese, Biella, Lombardy, Italy Medium to fine-grained syenite of predominantly plagioclase feldspar, beige-coloured potash feldspar, black hornblende, and biotite.
852stone 852 Granito bigio grafico, from Fontaine du Gènie, Tipaza, Algeria; or just possibly syenite della Balma, from Balma Biallese, Biella, Lombardy, Italy Medium to fine-grained syenite of predominantly plagioclase feldspar, beige-coloured potash feldspar, biotite, muscovite and black hornblende.
900stone 900 Granito di Napoli, from Naples, Campania, Italy Biotite tonalite. Coarse-grained, with a gneisssose structure developed at one end of specimen. Mica shows rusty-coloured alteration.
665stone 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.
666stone 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.
667stone 667 Lava di Borghetto, from Borghetto, Civita Castellana, Viterbo, Lazio, Italy Phonolite tephrite. A porphyritic rock with euhedral white megacrysts of leucite and scattered black pyroxene crystals in a fine-grained groundmass. The leucite megacrysts are cracked, sometimes concentrically zoned, and contain inclusions of pyroxene.
664stone 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.
663stone 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.
673stone 673 Basalte verde, locality unknown 'Greenstone' - a metabasalt or metabasaltic tuff flecked with iron-rich spots.
674stone 674 Basalte listata, possibly from Wadi Hammamat, Eastern Desert, Egypt Most probably a metagreywacke, a metamorphosed turbidite deposit with sand to silt sized particles.
676stone 676 Basalte antico, Bekhen-stone, from Wadi Hammamat, Eastern Desert, Egypt Most probably a metagreywacke, a metamorphosed turbidite deposit with sand to silt sized particles.
583stone 583 'Serpentina verde dell'Elba', from the island of Elba, Livorno, Tuscany, Italy Actinolite rock. Radiating crystals of actinolite; the surface is coated with brown filler.
588stone 588 Serpentina di Corsica, from Corsica, France Amphibolite; probably mostly actinolite - mainly granular but fibrous/prismatic in veins. Irregular patches and veinlets of opaque oxide (probably magnetite). Contains disseminated pale yellow carbonate flecks.
868stone 868 Granito delle Alpi, from the Alps Medium-grained meta-basite with plagioclase megacrysts. Irregular thin veins are coloured light brown by wax filler.
751stone 751 Diaspro delle Alpi, from the Alps (not confirmed) Deformed ferruginous chert, markedly dense hematite-rich rock. Fractures are filled with greenish quartz. It might be associated with an ophiolite deposit.
560stone 560 Lavagna antica, locality unknown Fine-grained siliceous rock with a few carbonate grains; The aggregates of orange-brown crystals are almost certainly relics of pyrite crystals; elsewhere, the pyrite is visible. Slate is not confirmed.
865stone 865 Granito dell'Elba, from the island of Elba, Livorno, Tuscany, Italy Biotite-rich migmatitic granitoid gneiss. Pink potash feldspar is concentrated in leucosomes, quartz and plagioclase in biotite-rich palaeosomes.
879stone 879 Granito delle Alpi, from the Alps Coarsely foliated diorite gneiss.
619stone 619 Serpentina di Corsica, from Corsica, France Strongly-foliated epidote-rich gneiss, probably derived from a basic igneous rock.
864stone 864 Corsican granite, granito di Corsica, from Corsica, France Rather fine-grained granitic gneiss with slightly discordant coarse-granitoid veins (perhaps migmatite leucosomes) . It is variably reddened and cut by late fractures near which feldspars have been altered to white spots. Veins near corner of specimen are leek green.
899stone 899 'Granito di Napoli', locality unknown Pink granite gneiss, augen are recrystallised potash feldspar. The quartz is rather finely recrystallised.
897stone 897 Corsican granite, granito di Corsica, from Corsica, France Granite gneiss with large porphyroblasts of potassium feldspar.
848stone 848 Granito Misio, from Kozak Mountains (the ancient Pergamon), Izmir,Turkey; or granito antico, from Gebel Dokhan (Mons Claudianus)-Wadi Umm Huyut area, Eastern Desert, Egypt. Tonalite gneiss with black hornblende. Distinct foliation evident on side of specimen.
677stone 677 Basalte di Venezia, from Venice, Veneto, Italy 'Greenstone' - a brecciated metabasaltic tuff with calcite veins. Some clasts show weak graded bedding.
607stone 607 'Serpentina delle Alpi', from the Alps, or more probably verde dell'Elba from the island of Elba, Livorno, Tuscany, Italy Ultrabasic rock composed of sprays up to a centimetre long of light green actinolite. These penetrate large dark sprays of amphibole, most probably hornblende.
610stone 610 'Serpentina dell'Elba', from the island of Elba, Livorno, Tuscany, Italy Actinolite rock, the actinolite in sprays up to a centimetre long. The large dark amphiboles (probably hornblende), also in radiating clusters, result from a later hydrothermal event.
595stone 595 Serpentina di Chiavari, from Chiavari, Genoa, Liguria, Italy Altered peridotite. The green is mainly fine actinolite; whitish areas are scattered with tiny opaque flakes perhaps of chromite. The dark coloured oxide, probably magnetite, has with brown and green-black reaction rims.
617stone 617 'Serpentina dell'Elba', from the island of Elba, Livorno, Tuscany, Italy Heavily alterered ?peridotite/pyroxenite; now composed mainly of actinolite.
612stone 612 Serpentina delle Alpi, from the Alps (not confirmed) Metagabbro?
614stone 614 Serpentina delle Alpi, from the Alps Metagabbro?
616stone 616 Serpentina delle Alpi, from the Alps Metagabbro.
672stone 672 Basalte scura, very possibly from Wadi Hammamat, Eastern Desert, Egypt Most probably a metagreywacke, a metamorphosed turbidite deposit with sand to silt sized particles.
601stone 601 'Serpentina dell'Elba', from the island of Elba, Livorno, Tuscany, Italy Metaperidotite, mainly actinolite, but with minor opaque oxide, cut by greyish veins.
597stone 597 Serpentina verde di Genova, from Genoa, Liguria, Italy Metaperidotite - probably serpentine and actinolite.
861stone 861 Beola di Milano, from Milan, Lombardy, Italy Mica schist.
489stone 489 Breccia degli Appennini, from the Apennines, Italy Deformed granitoid; porphyroblasts are quartz dominantly, perhaps originally vein quartz, now disrupted.
606stone 606 Serpentine, possibly Sterzinger Serpentin, from Vipiteno (Sterzing), Bolzano, Trentino-Alto Adige, Italy Strongly-foliated meta-ultrabasic rock, green domains appear to be finely-recrystallised tremolite/actinolite. Large pinkish-brown augen-shaped grains may be orthopyroxene, altered to varying degrees. Pyrite and chromite/magnetite are abundant.
421stone 421 Breccia della villa Adriana, breccia Quintilina, most probably from Levanto, Liguria, Italy Serpentinite breccia.
593stone 593 Marmo di Santa Cattarina dell'Elba, from the island of Elba, Livorno, Tuscany, Italy Serpentinite, finely brecciated and veined with calcite.
675stone 675 Basalte fiorita, locality unknown Serpentinised metabasalt with rounded aggregates of crystallites. Some small vesicles are filled with dark calcite.
708stone 708 Marmor aequipondus, perhaps from Liguria, Italy Serpentinised (or possibly fine amphibolitised) peridotite with coarse-grained green former pyroxenes, pale green former olivine domains, and opaque oxide.
571stone 571 Serpentina verde di Susa, from Val di Susa, Turin, Piedmont, Italy Serpentinite veined with fine-grained grey calcite.
573stone 573 Serpentina verde di Calabria, from Calabria, Italy Brecciated serpentinite.
584stone 584 Serpentina verde di Polcevera, from Polcevera, Genoa, Liguria, Italy Brecciated serpentinite.
585stone 585 Serpentina verde di Polcevera, from Polcevera, Genoa, Liguria, Italy Brecciated serpentinite.
586stone 586 Serpentina verde di Polcevera, from Polcevera, Genoa, Liguria, Italy Brecciated serpentinite.
587stone 587 Serpentina verde di Polcevera, from Polcevera, Genoa, Liguria, Italy Brecciated serpentinite.
608stone 608 Serpentina delle Alpi, from the Alps Silicified serpentinite breccia. Rounded clasts of granular silicified serpentine in massive quartz matrix, with streaks of cream quartz-dolomite.
598stone 598 Serpentina di Corsica, from Corsica, France Breccia of angular clasts of brown and pale green serpentinite in a paler coloured matrix with a reticulated system of very fine grey fibrous chrysotile veins throughout.
600stone 600 Serpentina delle Alpi, from the Alps (not confirmed) Serpentinite with calcite-filled veins and cavities.
609stone 609 Serpentina verde di Sardegna, from Sardinia, Italy Serpentinite with hints of coarse-grained peridotite microstructure evident in dark domains. Contains scattered crystals of pyrite and disseminated flecks of pale yellow carbonate mineral.
679stone 679 Breccia verde d'Egitto, Breccia universale, from Wadi Hammamat, Eastern Desert, Egypt Metaconglomerate of metamorphic and igneous clasts (banded tuff, serpentinite, etc) in a sheared chloritised or epidotised matrix. Note that granitic clasts commonly also occcur in this stone, see 969.
620stone 620 Serpentina di Genova, from Genoa, Liguria, Italy Silicified serpentinite. Rounded fragments of serpentinite with abundant euhedral to granular oxide inclusions in minor quartz matrix. The edges of the fragments have blue-green reaction rims.
613stone 613 Serpentina delle Alpi, perhaps serpentina di Valmalenco, from the Alps, and perhaps Valmalenco, Sondrio, Lombardy, Italy Serpentinite with rounded grains and granular aggregates of grey oxide mineral in dirty-yellow to blue-green serpentine. Two weak foliations evident.
572stone 572 Serpentina verde di Susa, from Val di Susa, Turin, Piedmont, Italy Heavily fractured serpentinite, cemented with grey calcite.
592stone 592 Serpentina di Corsica, from Corsica, France Serpentinised harzburgite with coarse relict texture making it easy to distinguish former olivine and orthopyroxene domains. Note the chrysotile veins.
Page 9 of 10, showing 801 - 900 of 1000 stones.
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