Mineral (Processed Alloy)

Browse mineral (processed alloy) specimens identified by the Rock Identifier community.

Jasper-Agate Breccia

Silicon Dioxide (SiO2) with iron oxide inclusions

sedimentary

Quartz Geode (with Calcite influence)

Silicon Dioxide (SiO2) with possible Calcium Carbonate (CaCO3)

mineral

Bauxite

AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)

sedimentary

Polished Quartz Sphere

Silicon Dioxide (SiO2)

mineral

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheets with Quartz)

metamorphic

Quartz Crystal Matrix

Silicon Dioxide (SiO2)

mineral

Shark Tooth Fossil

Selachii fossil

fossil

Fossil Shell (Bivalve)

Phylum Mollusca, Class Bivalvia

fossil

Fossil Seashell

Invertebrate fossil (Bivalvia)

fossil

Mystic Topaz (Treated Quartz or Topaz)

Silicate Mineral (SiO2 or Al2SiO4(F,OH)2) with Titanium coating

gemstone

Leopard Skin Jasper

Silicon Dioxide (SiO2) with iron and manganese inclusions

sedimentary

Ironstone Concretion (Desert Varnish / Hematite-Goethite Nodule)

Iron oxide / hydroxide deposit (predominantly Fe2O3 and FeO(OH))

sedimentary

Snakeskin Agate

Cryptocrystalline Quartz (SiO2)

sedimentary

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

metamorphic

Dalmatian Stone

Dalmatian Jasper (Aplitic Perthite)

igneous

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

sedimentary

Tiger's Eye

SiO2 (Quartz with inclusions of altered crocidolite)

metamorphic

Tiger's Eye

SiO2 (Silicon Dioxide with Iron Oxide inclusions)

Mineral (Metamorphic pseudomorph)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

metamorphic

Sandstone (Ferruginous)

Arenite (Fe2O3 stained)

sedimentary

Sandstone (Tafoni Weathered)

Arenite (part of the Sandstone family)

sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

sedimentary

Leopard Skin Jasper

Silicon Dioxide (SiO2) with various inclusions

sedimentary

Jasper

Silicon dioxide (SiO2) with impurities

sedimentary

Fossilized Shark Tooth

Otodus sp. (approximate genus) / Hydroxyapatite fossil

sedimentary

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

sedimentary

Sandstone

Sandstone (clastic sedimentary rock, predominantly SiO2)

sedimentary

Blue Quartzite

Quartzite with inclusions (often Dumortierite or Magnesio-riebeckite)

metamorphic

Mica Schist

Mica Schist (Complex Silicate Rock)

metamorphic

Granite Gneiss

Gneiss (High-grade Metamorphic Rock)

metamorphic

Mica Group Minerals

There isn't a single scientific name as 'Mica' refers to a group of phyllosilicate minerals. Common scientific names include Muscovite (KAl₂ (AlSi₃O₁₀)(OH)₂), Biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH)₂), Phlogopite (KMg₃AlSi₃O₁₀(OH)₂), and Lepidolite (K(Li,Al)₃(Al,Si,Rb)₄O₁₀(F,OH)₂).

Mineral