Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Category
Mineral (Evaporite)
Browse mineral (evaporite) specimens identified by the Rock Identifier community.
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Sunstone
Oligoclase (Feldspar variety), (Na,Ca)(Si,Al)4O8
mineral
Chrysocolla in Quartz (Quantum Quattro variant)
Hydrated copper silicates (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) often mixed with SiO2
mineral
Auriferous Quartz with Pyrite
Gold-bearing Quartz (SiO2 + FeS2 + Au)
mineral
Botryoidal Agate / Chalcedony Geode
Silicon Dioxide (SiO2)
mineral
Quartz with Schist/Mica Inclusions
Crystalline Silicon Dioxide (SiO2) with Phyllosilicates
metamorphic
Paraiba Tourmaline
Elbaite Tourmaline (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4) - Copper-bearing
mineral
Amazonite
Amazonite (KAlSi3O8, a variety of Microcline)
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Amazonite (with smoky quartz/feldspar inclusions)
K(AlSi3O8), Microcline (Tectosilicate)
mineral
Blue Apatite
Fluorapatite / Ca5(PO4)3F
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium and/or Vanadium impurities
mineral
Gold Ore
Gold-bearing Quartz (Native Gold, Au)
mineral
Yellow Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Amazonite
Microcline (KAlSi3O8)
mineral
Amethyst
Crystalline Quartz (SiO2 with iron impurities)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Kunzite (Spodumene)
Spodumene (LiAlSi2O6)
mineral
Smoky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst (Rough Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Caribbean Calcite
Calcium Carbonate with Aragonite (CaCO3)
mineral
Charoite
Charoite (K(Ca,Na)2Si4O10(OH,F)·H2O)
metamorphic
Chrysocolla in Matrix
Chrysocolla (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Herkimer Diamond (Quartz Crystal)
Silicon Dioxide (SiO2)
mineral
Amethyst (as seen in jewelry)
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst Quartz
Amethyst (Silicon Dioxide, SiO2)
mineral
Amethyst (Polished Cabochon)
Silicon Dioxide (SiO2) with iron impurities
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Amazonite
K(AlSi3O8), Microcline
mineral
Amethyst (Pale/Light Variety)
Quartz (Silicon Dioxide) with Iron impurities - SiO2
mineral
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Barite
Barium Sulfate (BaSO4)
mineral
Amygdaloidal Basalt
Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)
igneous
Martian Meteorite (Black Beauty)
NWA 7034 (Northwest Africa 7034)
igneous
Basalt with Sulfide/Pyrite inclusion
Aphanitic Mafic Igneous Rock (likely Basalt) with Pyrite (FeS2)
igneous
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Fossilized Fish (Lepidotes)
Lepidotes sp. (Order: Lepisosteiformes)
sedimentary