Pyrite
Iron Sulfide (FeS2)
mineral
Category
Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)
Browse industrial byproduct (often confused with igneous rocks or meteorites) specimens identified by the Rock Identifier community.
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Labradorite (tumbled)
Labradorite (a plagioclase feldspar mineral between anorthite and albite; chemical formula: (Ca,Na)(Si,Al)4O8)
Mineral
Small polished pink-and-white mineral pebble
Likely rose quartz or pale pink quartz; exact identification is uncertain from the image
mineral
Agate Bookend / Quartz Geode
Silicon Dioxide (SiO2)
mineral
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Chiastolite
Andalusite variety Chiastolite
mineral
Black Tourmaline (Schorl)
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
mineral
Bauxite
Bauxite (mainly Al(OH)3, AlO(OH))
sedimentary
Greenstone / Serpentinite
Serpentine-group / Altered Mafic Rock
metamorphic
Chert (Chalcedony/Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Biotite Schist
Biotite Gneiss/Schist (approximate formula K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Schist
Mica Schist
metamorphic
Blue Sapphire and Diamond (Set in Metal)
Corundum (Al2O3) and Diamond (C)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Banded Gneiss
Gneiss
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Labradorite
Labradorite (Plagioclase Feldspar Series) - (Ca, Na)(Al, Si)4O8
mineral
Epidote
Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))
mineral
Pyrite (on the right) and Magnetite or Hematite (on the left)
Iron Sulfide (FeS2) and Iron Oxide (Fe3O4 or Fe2O3)
mineral
Gneiss
Gneiss
metamorphic
Granite
Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)
igneous
Citrine
Silicon dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Garnet Schist
Almandine-bearing Mica Schist
metamorphic
Smoky quartz
Quartz, silicon dioxide (SiO₂), smoky variety
mineral
Ferruginous Quartz
Quartz (Silicon Dioxide, SiO2) with Iron Oxides
mineral
Ironstone (Limonitic Concretion)
Limonite (FeO(OH)·nH2O) with Goethite and Hematite inclusions
sedimentary
Agate (specifically Oco or Banded Agate)
Agate (a variety of Chalcedony), SiO2 (Silicon Dioxide)
mineral
Vesicular quartz-rich rock, possibly weathered rhyolite or silicified volcanic breccia
Silica-rich volcanic rock; likely microcrystalline quartz (SiO₂) with altered feldspar and iron-oxide staining
igneous
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Vanadinite
Lead Chlorovanadate, Pb5(VO4)3Cl
mineral
White quartz-rich pebble
Likely quartzite or milky-quartz pebble (SiO₂)
mineral
Labradorite
Labradorite (a calcium-enriched sodic plagioclase feldspar mineral - (Ca, Na)(Al, Si)4O8)
mineral
Raw black tourmaline (probable schorl)
Schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Biotite Schist
Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic