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
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).
807stone 807 'Porfido serpentino antico', locality unknown Grey porphyry, perhaps a porphyritic diorite or granodiorite with phenocrysts of white 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.
809stone 809 Porfido serpentino nero, from Wadi Umm Towat, near Gebel Dokhan, Eastern Desert, Egypt Trachyandesite porphyry with white phenocrysts of plagioclase feldspar.
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.
811stone 811 Porfido delle Alpi, from the Alps Porphyry with large phenocrysts of white plagioclase feldspar.
812stone 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.
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.
814stone 814 most probably granito nero, from between Aswan and Shellal District, Nile Valley, Egypt Biotite granodiorite; probably a variety of the Aswan granodiorite from the Precambrian basement rocks.
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.
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.
819stone 819 Granito violetto, marmor Troadense, from Çigri Dâg, Ezine, Canakkale, Marmara; Turkey Medium-grained quartz monzonite with large violet-grey megacrysts of potash feldspar in a groundmass of quartz, plagioclase, biotite and hornblende.
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.
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?
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.
824stone 824 Granito antico, locality unknown Medium-grained gabbro or metagabbro (lightly metamorphosed). Minor grains of pyrite.
825stone 825 Granito verde della Sedia di San Lorenzo, from Wadi Umm Wikala, near Wadi Semna, Eastern Desert. Egypt Fine to medium-grained gabbro or metagabbro (weakly metamorphosed) with some alteration of the green augite to brown?
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?).
827stone 827 Granito antico, locality unknown Fine-grained gabbro, rich in grains of pyrite the oxidation of which has caused some ferruginous staining.
828stone 828 Granito verde a erbetta, from Wadi Umm Wikala, near Wadi Semna, Eastern Desert. Egypt Fine to medium-grained metagabbro, with extensive alteration of augite to chlorite and some chloritisation around the edges of plagioclase feldspar crystals. Metallic pale yellow pyrite is present as scattered crystals.
829stone 829 possibly granito nero, from between Aswan and Shellal District, Nile Valley, Egypt Biotite granodiorite with some alteration to chlorite; possibly a variety of the Aswan granodiorite from the Precambrian basement rocks.
830stone 830 just possibly granito nero, from between Aswan and Shellal District, Nile Valley, Egypt Fine-grained hornblende biotite granodiorite; just possibly a variety of the Aswan granodiorite from the Precambrian basement rocks.
831stone 831 Granito rosso antico minuto, from between Aswan and Shellal District, Nile Valley, Egypt Fine-grained hornblende biotite muscovite granite.
832stone 832 Granito rosso antico minuto, from between Aswan and Shellal District, Nile Valley, Egypt Fine-grained hornblende biotite granite.
833stone 833 Granito rosso antico minuto, from between Aswan and Shellal District, Nile Valley, Egypt A fairly fine-grained hornblende biotite granite/granodiorite hybrid.
834stone 834 perhaps africano, from Locality unknown; if africano, then from Sigacik (ancient Teos), Izmir Province, Turkey A metamorphosed breccia of dark dolomitic? limestone containing bioclasts such as forams, echinoderm spines and perhaps crinoid ossicles. There are also scattered pyrite crystals and some reddish intraclasts. The matrix is coarsely crystalline pink calcite. There is some chlorite development around clasts. Note the iron-stained calcite-filled fracture.
835stone 835 Granito nero, from between Aswan and Shellal District, Nile Valley, Egypt Hornblende biotite granite/granodiorite hybrid with white feldspar megacrysts. It is crossed by a pink granite (predominantly potash feldspar) vein.
836stone 836 Granito nero, from between Aswan and Shellal District, Nile Valley, Egypt Biotite granodiorite with a few megacrysts of pink potash feldspar; a variety of the Aswan granodiorite from the Precambrian basement rocks.
837stone 837 Granito rosso antico, sienite, from between Aswan and Shellal District, Nile Valley, Egypt Coarse-grained biotite granite with large megacrysts of pink K-felspar.
838stone 838 probably granito Sardo, from Capo Testa, Olbia-Tempio, Sardinia, Italy; but possibly granito rosso antico, from between Aswan and Shellal District, Nile Valley, Egypt A medium-grained granite with pink potash feldspar, biotite and quartz.
839stone 839 Granito rosso antico, sienite, from between Aswan and Shellal District, Nile Valley, Egypt Coarse-grained biotite granite with megacrysts of salmon K-felspar.
840stone 840 Granito rosso antico, sienite, from between Aswan and Shellal District, Nile Valley, Egypt Coarse-grained biotite granite with megacrysts of salmon K-felspar.
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.
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.
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.
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.
845stone 845 Granito nero, from between Aswan and Shellal District, Nile Valley, Egypt Biotite-bearing granodiorite with a few aligned feldspar megacrysts.
846stone 846 Granito nero, from between Aswan and Shellal District, Nile Valley, Egypt Biotite-bearing granodiorite with a few small pink K-feldsar megacrysts, and a vein of potash feldspar across the corner of the sample.
847stone 847 Marmor Claudianum, granito del Foro, from Mons Claudianus, Eastern Desert, Egypt It is a weakly metamorphosed granodiorite showing some foliation, and composed mainly of plagioclase feldspar, hornblende, biotite, and lesser amounts of quartz, with traces of epidote.
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.
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.
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.
853stone 853 'Granito dell'Elba'; the island of Elba, Livorno, Tuscany, Italy, is not confirmed Dacite lava with phenocrysts of quartz, plagioclase feldspar and a pale green pyroxene.
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.
855stone 855 Granito di Corsica, from Corsica, France Gabbro-pyroxenite. Melanocratic. Very dark green pyroxene with minor brown amphibole and interstitial white feldspar.
856stone 856 Granito, probably granito di Corsica, from Corsica, France Coarse-grained granodiorite with megacrysts of pink potash-feldspar, rather smoky quartz, and accessory titanite.
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.
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.
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.
860stone 860 Granito delle Alpi, from the Alps Coarse, cataclastic granite with recrystallised quartz and rare altered mica showing kink bands.
861stone 861 Beola di Milano, from Milan, Lombardy, Italy Mica schist.
862stone 862 Granito delle Alpi, from the Alps Quartzite. Pale grey, equigranular. Minor feldspar interstitial haematitic staining.
863stone 863 'Granito di Perosa', from Perosa Argentina, Chisone valley, Turin, Piedmont, Italy Arkosic grit formed by weathering of quartz and feldspar-rich igneous or metamorphic rocks. Brownish red, well bedded; with scattered larger clasts of carbonate 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.
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.
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.
869stone 869 Corsican granite, granito di Corsica, from Corsica, France Monzonite. Anhedral pink potash feldspar, greenish altered plagioclase and interstitial green amphibole.
870stone 870 Sandstone, from the Alps A quartz sandstone with abundant mafic mineral grains, scattered large forams and other shell fragments, and some calcareous grains/cement.
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.
872stone 872 Granito di Corsica, from Corsica, France Strongly foliated meta-gabbro, brown areas are filler/polishing compound.
873stone 873 Granito di Genova, from Genoa, Liguria, Italy Coarse-grained metagabbro, with serpentinised pyroxene crystals.
874stone 874 Granito orbiculare di Corsica, from shore of River Taravo, near Olmeto, Corse-du-Sud, Corsica, France Orbicular diorite, the layers composed of plagioclase, hornblende, or a combination of these minerals.
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.
876stone 876 probably granito nero, from between Aswan and Shellal District, Nile Valley, Egypt Amphibole-rich granodiorite-tonalite with megacrysts of plagioclase, and accessory titanite. There is some alignment of megacrysts giving faint foliation.
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.
878stone 878 'Granito delle Alpi', from the Alps Sandstone with abundant green siliceous clasts and with a calcareous cement.
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.
881stone 881 Pietra di Malanaggio, from Malanaggio, Val Chisone, Piedmont, Italy Grey medium-grained foliated meta-granodiorite with aligned brownish altered amphibole.
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.
883stone 883 Granito delle Alpi, from the Alps Coarse foliated granodiorite with prominent pink potash-feldspar; plagioclase is pale green.
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.
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.
886stone 886 Pietra di Malanaggio, from Malanaggio, Val Chisone, Piedmont, Italy A foliated, recrystallised medium-grained meta-granodiorite.
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.
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.
892stone 892 Bianco Montorfano, from Montorfano, Novara, Piedmont, Italy Hornblende biotite granite.
893stone 893 Baveno granite, rosa Baveno, from Baveno, Novara, Piedmont, Italy Coarse hornblende granite with pale pink perthitic potash-feldspar.
894stone 894 Possibly granito di Corsica from Corsica, France, but more probably bianco Montorfano, from Montorfano, Novara, Piedmont, Italy Coarse hornblende biotite granite with accessory apatite and titanite.
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.
897stone 897 Corsican granite, granito di Corsica, from Corsica, France Granite gneiss with large porphyroblasts of potassium feldspar.
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.
899stone 899 'Granito di Napoli', locality unknown Pink granite gneiss, augen are recrystallised potash feldspar. The quartz is rather finely recrystallised.
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.
Page 9 of 10, showing 801 - 900 of 1000 stones.
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