Pyrite
Iron Sulfide (FeS2)
mineral
Category
Mineral (Man Made Glass, Not Natural)
Browse mineral (man made glass, not natural) specimens identified by the Rock Identifier community.
Learn about Mineral (Man Made Glass, Not Natural) in the encyclopedia
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Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Chalcopyrite (Peacock Ore)
Copper Iron Sulfide (CuFeS2)
mineral
Quartz (likely tumbled or naturally water-worn)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Serpentinite
Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)
Metamorphic Rock
Green cabochon gemstone pendant
Indeterminate; likely dyed green turquoise, chrysoprase, or opaque beryl set with blue/clear accent stones
gemstone
Granite
Felsic intrusive igneous rock (Granite)
igneous
Dyed Blue Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Emerald (Rough)
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Calcite
Calcium Carbonate (CaCO3)
mineral
Amethyst
Silicon dioxide (SiO2)
mineral
Amethyst (Tumbled)
Silicon Dioxide (Quartz) with traces of Iron; SiO2
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Dyed Agate
Agate (Silicon Dioxide, SiO2)
Mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Shale or Siltstone
Fine-grained siliciclastic sedimentary rock
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Erythrite (or Lab-Grown Cobaltite/Cinnabar Analog)
Erythrite (Co3(AsO4)2·8H2O)
mineral
Diamond (in Jewelry)
Diamond (Carbon, C)
mineral
Dyed Agate Slice
Microcrystalline Quartz (SiO2) with artificial pigment
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Diamond
Natural Diamond (Carbon, C)
mineral
Rough Diamond
Diamond (pure carbon, C)
mineral
Diamond (in jewelry setting)
Cubic Carbon (C)
mineral
Shale with Vein Infillings
Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.
Sedimentary Rock
Staurolite
Staurolite (Fe2Al9O6(SiO4)4(O,OH)2)
mineral
Amethyst
Quartz variety; chemical formula: SiO₂ (silicon dioxide) with Fe³⁺ impurities
Mineral
Weathered fossiliferous limestone fragment, possibly fossil coral or shell material
Indeterminate carbonate fossil in calcitic limestone; likely composed mainly of calcite (CaCO₃), but species identification is not possible from this image alone
fossil
Orbicular granite (likely rapakivi-type granite)
Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende
igneous
Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral
Shale
Argillaceous sedimentary rock
sedimentary
Howlite
Howlite, Ca₂B₅SiO₉(OH)₅
mineral
River Pebbles (Quartzite / Granite Pebbles)
SiO2 (Quartz-rich detrital gravel)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Jasper and Agate
Microcrystalline Quartz (SiO2)
sedimentary
Dyed Agate
SiO2 (Silicon Dioxide)
Mineral
Cubic Zirconia
Zirconium Dioxide (ZrO2)
mineral
Pearl
Aragonite (CaCO3) with Conchiolin
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral