Psilomelane (Black Hematite varietal)
Barium Manganese Oxide (Ba,H2O)2Mn5O10
mineral
Category
Mineral (Evaporite)
Browse mineral (evaporite) specimens identified by the Rock Identifier community.
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Garnet (specifically Almandine)
Almandine - Fe3Al2(SiO4)3
metamorphic
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Quartz Vein in Host Rock (often Granite or Schist)
Silicon Dioxide (SiO2) within host matrix
mineral with metamorphic or igneous host
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Tiffany Stone
Fluorite Opal (a complex mix of Fluorite, Opal, Calcite, Dolomite, Quartz, and Bertrandite)
mineral
Green Aventurine in Host Rock
Quartz (SiO2) with Fuchsite inclusions
mineral
Basalt with Granite Inclusions (Xenoliths)
Mafic igneous rock (Basalt) with Sialic minerals
igneous
Sandstone (Fluvial Pebble)
Arenite
sedimentary
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
sedimentary
Red Sandstone
Clastic Terrigenous Sedimentary Rock (composed mostly of SiO2 with Fe2O3)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Hematite
Iron (III) Oxide (Fe2O3)
mineral
Charoite
Charoite (K(Ca,Na)2Si4O10(OH,F)·nH2O)
metamorphic
Quartz Vein in Rhyolite
Silicon Dioxide (SiO2) in extrusive igneous rock
igneous
Amazonite
K(AlSi3O8) - Lead-bearing Microcline (Tectosilicate)
mineral
Prehnite
Prehnite Ca2Al2Si3O10(OH)2
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Hypersthene
Hypersthene ((Mg,Fe)SiO₃)
Mineral
Polished Black Obsidian
Volcanic Glass (70-75% SiO2)
igneous
Quartz / Quartzite
Silicon Dioxide (SiO2)
Mineral / Metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Aventurine (specifically a carved crescent moon)
Silicon Dioxide (SiO2) with inclusions
mineral
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (clastic sedimentary rock)
Rock
Fossilized Shark Tooth
Bioapatite (Calcium Hydroxyapatite) replacement
mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in Geode
mineral
Pegmatite (Granitic)
Granitic Pegmatite
igneous
Quartz (Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Citrine
Silicon Dioxide (SiO₂)
mineral
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Garnet (likely Almandine)
Almandine Garnet, Fe3Al2(SiO4)3
mineral
Quartz Geode
Crystalline Quartz (Silicon Dioxide, SiO2)
mineral
Mica (Lepidolite or Muscovite)
Phyllosilicate mineral (KAl2(AlSi3O10)(OH)2 for Muscovite)
mineral
Tumbled Stone Collection (featuring Tiger's Eye, Rose Quartz, and Moss Agate)
Mixed Silicates and Oxides (predominantly SiO2 group minerals)
mineral