Calcite
Calcium Carbonate (CaCO3)
mineral
Category
Mineral (Biogenic)
Browse mineral (biogenic) specimens identified by the Rock Identifier community.
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Quartz (Milky/Snow)
Silicon Dioxide (SiO2)
mineral
Pyrite in Matrix
Iron Disulfide (FeS2)
mineral
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Satin Spar Selenite
Gypsum (CaSO4·2H2O)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Pink Satin Spar (Satin Spar Selenite Dyed)
Gypsum (CaSO4·2H2O)
mineral
Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Sandstone (likely Quartzose Sandstone with mineral staining)
Arenite (composed mainly of SiO2)
sedimentary
Ferrochrome Slag
Anthropogenic slag (Fe-Cr alloy waste)
industrial byproduct
Specularite in Quartz
Specular Hematite (Fe2O3) in Quartz (SiO2)
mineral
Bloodstone (Heliotrope)
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Banded Agate (Lake Superior Agate style)
Silicon Dioxide (SiO2)
mineral
Rainbow Moonstone
White Labradorite (Plagioclase Feldspar), (Na,Ca)(Al,Si)4O8
gemstone
Amethyst Cluster
Silicon Dioxide (SiO2) with iron impurities
mineral
Rainbow Moonstone (White Labradorite)
White Labradorite (Feldspar variety, (Na,Ca)(Al,Si)4O8)
mineral
Amazonite
Microcline (KAlSi3O8) with lead impurities
mineral
Amethyst Geode
Amethyst (Silicon Dioxide, SiO2)
mineral
Aura Quartz / Rainbow Aura Quartz
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Copper-bearing Quartz (with Malachite and Iron Oxides)
Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)
Mineral Specimen
Chert (Jasper/Chalcedony mix)
Microcrystalline Quartz (SiO2)
sedimentary
Gold Ore (Auriferous Quartz with Chalcopyrite/Pyrite)
Au (Native Gold) in Quartz (SiO2) with FeS2 (Pyrite) or CuFeS2 (Chalcopyrite)
Mineral
Amethyst and Peridot
Amethyst (SiO2 with iron impurities) and Peridot ((Mg, Fe)2SiO4)
mineral
Jasper
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Silicified Riebeckite Asbestos (SiO2 with inclusions)
metamorphic
Chrysocolla
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Gold-bearing Quartz Ore
Auriferous Quartz (SiO2 with Au)
mineral
Hypersthene
Hypersthene ((Mg,Fe)SiO3)
mineral
Epidosite (Unakite-related)
Epidosite (composed primarily of Epidote and Quartz)
metamorphic
Green Quartz (Prasiolite/Adventurine)
Silicon Dioxide (SiO2) with inclusions
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Fire Opal
Hydrated Silica (SiO2·nH2O)
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Amazonite
Potassium Feldspar (KAlSi3O8)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Amethyst (Quartz)
Silicon Dioxide (SiO2)
mineral
Biotite on Matrix
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Limonite pseudomorph after Pyrite
Goethite/Limonite FeO(OH)·nH2O
mineral
Geode (Unopened)
SiO2 (Quartz-filled Sedimentary Nodule)
sedimentary
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Opal
Hydrated silica (SiO2 "NH2O)
mineraloid