Rough Corundum (Sapphire/Ruby mixture)
Corundum (Aluminum Oxide, Al2O3)
mineral
Category
Igneous, Sedimentary, And Metamorphic
Browse igneous, sedimentary, and metamorphic specimens identified by the Rock Identifier community.
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Potassium Feldspar
K-Feldspar (KAlSi3O8)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Plagioclase Feldspar
Plagioclase Feldspar Series (NaAlSi3O8 - CaAl2Si2O8)
Mineral
Feldspar (Orthoclase)
Potassium Feldspar (KAlSi3O8)
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Red Garnet (Almandine-Pyrope series)
Garnet Group, Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)
mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Strawberry Quartz (or Hematoid Quartz)
Silicon Dioxide (SiO2) with inclusions of Hematite or Goethite
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Mica (Muscovite)
Potassium aluminum silicate - KAl2(AlSi3O10)(OH)2
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(OH)2
mineral
Tumbled Agate
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Tumbled Agate
Silicon Dioxide (SiO2)
gemstone
Agate Bookend / Quartz Geode
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Agate
Silicon dioxide (Chalcedony), SiO2
gemstone
Schist (Greenschist / Mica Schist)
Metamorphic rock rich in platy minerals (e.g., Chlorite/Mica schist)
metamorphic
Greenstone
Greenschist facies metabasite
metamorphic
Greenschist / Serpentinite Cobble
Greenschist (composed primarily of chlorite, actinolite, and epidote)
metamorphic
Greenschist
Chlorite-actinolite schist
metamorphic
Greenstone / Greenschist
Chlorite schist / Epidiorite / Metabasalt
metamorphic
Nephrite Jade (Yellow Skin)
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Greenschist
Greenschist (Chlorite-actinolite schist)
metamorphic
Greenstone
Greenschist
metamorphic
Greenstone
Protolith: Basaltic rock
metamorphic
Greenschist
Greenschist (Chlorite Schist)
metamorphic
Soapstone
Steatite (composed primarily of Talc, Mg3Si4O10(OH)2)
metamorphic
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)
metamorphic
Greenstone / Metabasalt
Metamorphosed Mafic Rock (Greenschist facies)
metamorphic
Diorite Gneiss
Foliated Diorite Gneiss
metamorphic
Greenstone
Greenschist (commonly containing Chlorite, Actinolite, and Epidote)
metamorphic
Greenschist
Greenschist (Major minerals include Chlorite, Actinolite, and Epidote)
metamorphic
Greenstone
Greenschist (composed of chlorite, actinolite, and epidote)
metamorphic
Greenschist / Greenstone
Greenschist facies metabasite
metamorphic
Dragon Blood Jasper
Epidote-rich Quartzite (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Greenstone with Pyrite inclusions
Greenschist / Meta-volcanic rock with Iron Disulfide (FeS2)
metamorphic
Epidosite (Epidote-rich rock)
Epidotalite (primarily Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Iolite (Cordierite)
Magnesium Iron Aluminum Silicate (Mg,Fe)2Al4Si5O18
mineral
Red Garnet
Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)
mineral