Corsi Collection of Decorative Stones

Page 6 of 10, showing 501 - 600 of 1000 stones.
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OUMNH number Name and quarry location Geological description
OUMNH number Name and quarry location Geological description
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.
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.
873stone 873 Granito di Genova, from Genoa, Liguria, Italy Coarse-grained metagabbro, with serpentinised pyroxene crystals.
997stone 997 Granito di Firenze, from Florence, Tuscany, Italy Hornblende biotite granite, porphyritic, with large megacrysts of potassium feldspar.
859stone 859 Granito di Cumiana, from Cumiana, Turin, Piedmont, Italy Probably a mylonitised granite. The brown iron-staining is less evident on reverse of specimen.
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.
855stone 855 Granito di Corsica, from Corsica, France Gabbro-pyroxenite. Melanocratic. Very dark green pyroxene with minor brown amphibole and interstitial white feldspar.
872stone 872 Granito di Corsica, from Corsica, France Strongly foliated meta-gabbro, brown areas are filler/polishing compound.
885stone 885 Granito delle Alpi, from the Alps; or perhaps from Predazzo, Trentino or elsewhere in Trentino-Alto Adige, Italy Coarse-grained quartz diorite with pale green plagioclase. Brown is filler/polishing compound.
1000stone 1000 Granito delle Alpi, from the Alps; or perhaps from Elba, Livorno, Tuscany, Italy Breccia of calcite marble, limestone, serpentine, and metagabbro clasts, with a single large metagabbro clast forming the greater part of the specimen.
882stone 882 Granito delle Alpi, from the Alps; or perhaps granito bigio dell'Elba, from the island of Elba, Livorno, Tuscany, Italy Medium-grained grey granodiorite with coarser patches and detached plagioclase megacrysts. Perthitic structure of the megacrysts gives a pale blue-grey iridescence.
875stone 875 Granito delle Alpi, from the Alps; or perhaps breccia d'Armenia, from the historical region of Armenia Coarse hornblende quartz monzonite with pale green-stained (chloritic?) plagioclase and accessory apatite. Specimen shows faint foliation.
884stone 884 Granito delle Alpi, from the Alps or possibly Bombiana, Bologna, Emilia-Romagna, Italy Coarse foliated hornblende diorite with chloritic inclusions in the plagioclase.
849stone 849 Granito delle Alpi, from the Alps Folded gneiss with granitic veins.
850stone 850 Granito delle Alpi, from the Alps Quartz diorite. Coarse-grained, equigranular. Plagioclase, amphibole (altering to yellow micaceous mineral), minor quartz.
851stone 851 Granito delle Alpi, from the Alps Hornblende granodiorite. Grey, equigranular. Faint alignment of feldspars. Uralitic alteration of amphibole. Larger plagioclases zoned outwards to untwinned feldspar. Occasional sphene visible with lens.
860stone 860 Granito delle Alpi, from the Alps Coarse, cataclastic granite with recrystallised quartz and rare altered mica showing kink bands.
862stone 862 Granito delle Alpi, from the Alps Quartzite. Pale grey, equigranular. Minor feldspar interstitial haematitic staining.
867stone 867 Granito delle Alpi, from the Alps Foliated coarse meta-basite.
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.
871stone 871 Granito delle Alpi, from the Alps Diorite. Individual and clustered crystals of green pyroxene and scattered black hornblende crystals in a white predominantly plagioclase groundmass. Dark blebs are entirely pyroxene.
877stone 877 Granito delle Alpi, from the Alps Diorite. Grey, medium-grained with sparse white feldspar megacrysts up to 20mm in groundmass of white feldspar, partially altered dark green amphibole.
879stone 879 Granito delle Alpi, from the Alps Coarsely foliated diorite gneiss.
880stone 880 Granito delle Alpi, from the Alps Fine to medium-grained meta-diorite with megacrysts of plagioclase, some containing very small dark inclusions; with pervasive iron oxide staining.
883stone 883 Granito delle Alpi, from the Alps Coarse foliated granodiorite with prominent pink potash-feldspar; plagioclase is pale green.
888stone 888 Granito delle Alpi, from the Alps Medium-grained quartz diorite.
889stone 889 Granito delle Alpi, from the Alps Coarse pale grey granodiorite displaying faint foliation.
890stone 890 Granito delle Alpi, from the Alps Grey microgranodiorite with ferromagnesian-rich irregular patches. Veinlets and cavities are coloured by brown filler/polishing compound. Alignment of biotite crystals gives distinct foliation, evident on sides of specimen.
891stone 891 Granito delle Alpi, from the Alps Fine to medium-grained granite showing a streaky texture; with pink perthitic potash-feldspar and white plagioclase.
895stone 895 Granito delle Alpi, from the Alps Foliated metadiorite or metagabbro with a coarse, ferromagnesium-rich band traversed by shear lines rich in dark mafic minerals, containing megacrysts/augen of plagioclase.
896stone 896 Granito delle Alpi, from the Alps Metadiorite with distinct foliation. Brown areas are polishing compound/filler.
898stone 898 Granito delle Alpi, from the Alps Biotite monzonite. Coarse-grained mottle brown and white rock with mafics>felsics and minor quartz. Pale brown alteration of mica.
998stone 998 Granito delle Alpi, from the Alps Feldsparphyric diorite. Fractured and replaced zoned feldspar phenocrysts and rarer clusters of amphibole, are set in a granular groundmass of white feldspar, quartz and a ferromagnesian mineral. It has pervasive chloritic alteration and granular recrystallisation. Pale green veins cross the specimen
999stone 999 Granito delle Alpi, from the Alps Sepentinite. Very coarse-grained. Mottled dark and lighter green. Dark green, veined and cleaved altered pyroxene perhaps with original exsolution texture. Pale green (?) antigorite pseudomorphs retaining ghost fracture pattern of original olivine. One end of specimen shows clasis with constituent minerals forming granular aggregate. White cross-cutting veins contain carbonate and silicate.
821stone 821 Granito della Sedia di San Pietro, from Wadi Umm Wikala, near Wadi Semna, Eastern Desert. Egypt Gabbro or metagabbro (weakly metamorphosed) with some alteration of the green augite to brown?
822stone 822 Granito della Sedia di San Pietro, from Wadi Umm Wikala, near Wadi Semna, Eastern Desert. Egypt Gabbro or metagabbro (weakly metamorphosed) with some alteration of the green augite to brown?
813stone 813 Granito della Colonna, from Wadi Umm Shegilat, near Gebel Abu el-Hasan, Eastern Desert, Egypt Coarse pegmatitic diorite, with large black prismatic crystals of hornblende.
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.
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.
866stone 866 Granito dell'Elba, from the island of Elba, Livorno, Tuscany, Italy Hornblende granodiorite with occasional plagioclase-rich clusters.
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?).
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.
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.
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.
844stone 844 Granito bianco e nero, from Wadi Barud, near Mons Claudianus, Eastern Desert, Egypt Quartz diorite with megacrysts of hornblende, white plagioclase feldspar and minor quartz.
996stone 996 Granito antico, very possibly granito bianco e nero gabino, from Bir Umm Fawakhir, near Wadis Hammamt and el-Sid, Eastern Desert, Egypt Granodiorite.
986stone 986 Granito antico, possibly granito verde fiorito di bigio from Wadi Umm Balad, near Gebel Dokhan, Eastern Desert, Egypt Quartz diorite.
990stone 990 Granito antico, possibly granito verde fiorito di bigio from Wadi Umm Balad, near Gebel Dokhan, Eastern Desert, Egypt Quartz diorite.
842stone 842 Granito antico, locality unknown; possibly a variety of granito nero from between Aswan and Shellal District, Nile Valley, Egypt Biotite-bearing granodiorite with a band crossing the specimen of more granitic composition with pink potash feldspars.
820stone 820 Granito antico, locality unknown Banded biotite gneiss. Medium grey bands of recrystallised quartz, feldspar and dark mica and lighter coarser bands with same mineralogy.
824stone 824 Granito antico, locality unknown Medium-grained gabbro or metagabbro (lightly metamorphosed). Minor grains of pyrite.
827stone 827 Granito antico, locality unknown Fine-grained gabbro, rich in grains of pyrite the oxidation of which has caused some ferruginous staining.
843stone 843 Granito antico, locality unknown Biotite tonalite, rich in biotite. Equigranular, with glassy plagioclase and subordinate alkali feldspar. Dark mica emphasises faint gneissose texture.
987stone 987 Granito antico, locality unknown Granodiorite, pinkish potash feldspar.
988stone 988 Granito antico, locality unknown Coarse-grained hornblende biotite granite with large megacrysts of salmon pink potash feldspar.
991stone 991 Granito antico, locality unknown Biotite granite. Pink, medium-grained. Pink alkali feldspar, white plagioclase and glassy quartz. Faint foliation.
993stone 993 Granito antico, locality unknown Fine-grained hornblende biotite granodiorite; some mafic grains included within quartz.
994stone 994 Granito antico, locality unknown Fine-grained hornblende biotite rapakivi granite with large pink perthitic phenocrysts of potash feldspar rimmed with colourless plagioclase.
995stone 995 Granito antico, locality unknown Porphyrtic trachyte. Abundant feldspar phenocrysts up to 15mm showing complex twinning, concentric zoning of inclusions and a tendency to cluster. Sparse microphenocrysts of amphibole substantially altered to rusty brown mineral (also occurs in the white feldspars). Possible rare quartz phenocrysts. Groundmass of milky-white and pale grey feldspars showing tendency to fluidal structure round phenocrysts. Occasional angular (?cognate) xenoliths of fine-grained equigranular rock consisting of feldspar and altered amphibol;e.
823stone 823 Granito antico, granito della Colonna, from Wadi Umm Shegilat, near Gebel Abu el-Hasan, Eastern Desert, Egypt Coarse pegmatitic diorite, with large black prismatic crystals of hornblende.
841stone 841 Granite antico, locality unknown; or more probably granito di Corsica, from Corsica, France Coarse-grained granite-granodiorite with large pink perthitic megacrysts of potash feldspar. It contains scattered euhedral grains of titanite.
125stone 125 Grand antique, bianco e nero antico, from Lez valley, Aubert, near St Girons, Hautes-Pyrénées, France Breccia of almost black limestone clasts in a compact white granular calcite matrix.
128stone 128 Grand antique, bianco e nero antico, from Lez valley, Aubert, near St Girons, Hautes-Pyrénées, France Breccia of grey limestone clasts in a compact white granular calcite matrix.
418stone 418 Grand antique, bianco e nero antico, from Lez valley, Aubert, near St Girons, Hautes-Pyrénées, France Black limestone breccia with calcite-filled voids and fractures. Some beige coloured areas are fossiliferous clasts and margins to black clasts.
138stone 138 Giallo tigrato, from Monte Calvo, Rieti, Lazio, Italy Fine-grained calcite with spar-filled stylolites, fractures and cavities, and with extensive development of dendritic black iron/manganese oxides.
41stone 41 Giallo di Verona, Verona yellow, from Torbe, or more probably Torri del Benaco, Verona, Veneto, Italy Brecciated fossiliferous biomicrite limestone crowded with large and small bioclasts.
42stone 42 Giallo di Verona, Verona yellow, giallo reale, from Torri del Benaco, Verona, Veneto, Italy Burrowed/nodular bioclast-rich fine-grained limestone (micrite/microsparite) with extensive calcite-filled stylolites. Note that the darker stylolites are coloured by wax filler. It contains rare juvenile ammonoids.
35stone 35 Giallo di Siena, Siena yellow, from Siena, Italy; most probably from the quarries at Monte Arrenti near Sovicille. Very fine-grained calcite marble or heavily altered limestone tinted yellow by secondary iron minerals.
36stone 36 Giallo di Siena, Siena yellow, from Siena, Italy; most probably from the quarries at Monte Arrenti near Sovicille. Very fine-grained calcite marble or heavily altered limestone tinted yellow by secondary iron minerals.
39stone 39 Giallo di Saltrio, from Saltrio, Milan, Italy; but more likely to be from the Verona area, Veneto, Italy Micritic limestone
501stone 501 Giallo di Pigozzo, from Pigozzo, Val Squaranto; Verona, Veneto, Italy Burrowed fossiliferous micritic limestone with foraminifera and debris probably of bivalves.
520stone 520 Giallo di Mizzolle, from Mizolle, Val Pantena, Verona, Veneto, Italy Micritic limestone with abundant yellow rhombic microcrystals of calcite. It has spar-filled fractures and scattered dendritic manganese oxides.
22stone 22 Giallo antico, from Chemtou, Tunisia Breccia of clasts of fine-grained limestone, largely recrystallised, in a ferruginous sparry micritic matrix.
23stone 23 Giallo antico, from Chemtou, Tunisia Breccia of clasts of fine-grained limestone, extensively recrystallised through diagenesis, in a ferruginous micritic matrix.
24stone 24 Giallo antico, from Chemtou, Tunisia Fine-grained limestone, extensively recrystallised through diagenesis but showing relics of a peloidal structure. It has slender ferruginous veins and small black manganese oxide dendrites. The sides of the specimen show that it is brecciated and cemented by a white sparry calcite matrix.
25stone 25 Giallo antico, from Chemtou, Tunisia Fine-grained limestone, extensively recrystallised through diagenesis, with slender ferruginous veins. Note areas of coarser crystalline calcite, probably the relics of fossils.
26stone 26 Giallo antico, from Chemtou, Tunisia Fine-grained limestone, extensively recrystallised through diagenesis, with slender ferruginous veins. Note areas of coarser crystalline calcite, probably the relics of fossils.
27stone 27 Giallo antico, from Chemtou, Tunisia Fine-grained limestone, extensively recrystallised through diagenesis, with spar-filled cavities. Distinct shear-texture visible.
28stone 28 Giallo antico, from Chemtou, Tunisia Breccia of clasts of fine-grained limestone, extensively recrystallised through diagenesis, in a ferruginous micritic matrix. Note areas of coarser crystalline calcite (probably the relics of fossils), and stylolites.
29stone 29 Giallo antico, from Chemtou, Tunisia Fine-grained limestone, extensively recrystallised through diagenesis, with slender ferruginous veins. Note areas of coarser crystalline calcite, probably the relics of fossils. The colour has changed to pink as a result of heating.
30stone 30 Giallo antico, from Chemtou, Tunisia Breccia of clasts of fine-grained limestone, extensively recrystallised through diagenesis, in a ferruginous micritic matrix.
31stone 31 Giallo antico, from Chemtou, Tunisia Breccia of clasts of fine-grained limestone, extensively recrystallised through diagenesis, in a ferruginous micritic matrix.
32stone 32 Giallo antico, from Chemtou, Tunisia Breccia of clasts of fine-grained limestone, extensively recrystallised through diagenesis, in a ferruginous micritic matrix. Note areas of coarser crystalline calcite (probably the relics of fossils).
33stone 33 Giallo antico, from Chemtou, Tunisia Breccia of clasts of fine-grained limestone, extensively recrystallised through diagenesis, in a ferruginous micritic matrix. Note areas of coarser crystalline calcite (probably the relics of fossils), and minor dendrites of manganese oxides.
34stone 34 Giallo antico, from Chemtou, Tunisia Breccia of clasts of fine-grained limestone, extensively recrystallised through diagenesis, in a ferruginous micritic matrix. It has been cut to show where the matrix has turned grey as a result of exposure to anoxic reducing conditions. Other parts of this specimen are the normal colour of a giallo antico.
40stone 40 Giallo antico, from Chemtou, Tunisia Fine-grained limestone, weakly metamorphosed and sheared, with yellow ferruginous stylolites, and scattered euhedral microcrystals of dark orange-brown iron oxide (goethite pseudomorphs after pyrite?) concentrated particularly in the stylolites.
545stone 545 Gesso di Volterra, alabastro di Volterra, from Volterra, Pisa, Tuscany, Italy Fine-grained compact gypsum (alabaster).
547stone 547 Gesso di Matelica, alabastro di Matelica, from Matelica, Macerata, Marches, Italy Crystals of gypsum as dark 'spots', and small fragments of micritic limestone, in a matrix of fine-grained compact gypsum (alabaster).
549stone 549 Gesso di Matelica, alabastro di Matelica, from Matelica, Macerata, Marches, Italy Micritic limestone containing bands of gypsum crystals, as spots and patches in fine-grained compact gypsum (alabaster).
550stone 550 Gesso di Matelica, alabastro di Matelica, from Matelica, Macerata, Marches, Italy Micritic limestone containing bands of gypsum crystals, as spots and patches in fine-grained compact gypsum (alabaster).
546stone 546 Gesso di Iesi, alabastro di Iesi, from Iesi, Ancona, Marches, Italy Fine-grained compact gypsum (alabaster) - nodular mass, fibrous towards margins.
552stone 552 Gesso di Faenza, from Faenza, Ravenna, Emilia-Romagna, Italy Calcite-cemented breccia with small angular gypsum clasts, patches of micritic limestone and smaller dark grains.
544stone 544 Gesso di Castellina Marittima, alabastro di Castellina Marittima, alabastro di Volterra, from Castellina Marittima, Pisa, Tuscany, Italy Fine-grained compact gypsum (alabaster) with calcite-filled fractures.
989stone 989 Gabbro eufotide, from Wadi Maghrabiya, Eastern Desert, Egypt Weakly metamorphosed coarse-grained gabbro with a subtle schiller to the plagioclase feldspar.
540stone 540 Fluorite, Blue John, from Derbyshire, England Hydrothermal vein deposit of fluorite. The narrow purple-blue colour zone indicates it is the Blue John variety.
541stone 541 Fluorite, Blue John, from Castleton, Derbyshire, England Hydrothermal vein deposit of colour-zoned purple-blue/colourless fluorite, the variety known as Blue John. It has some yellow ferruginous staining.
Page 6 of 10, showing 501 - 600 of 1000 stones.
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