Pyrite
Iron Sulfide (FeS2)
mineral
Category
Igneous And Sedimentary
Browse igneous and sedimentary specimens identified by the Rock Identifier community.
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Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst and Hematite Bracelet
Amethyst (SiO2) and Hematite (Fe2O3)
mineral
Agate (specifically a Blue Agate Geode Slice)
Chalcedony (cryptocrystalline variety of Quartz); SiO2
mineral
Unidentified Rock Fragment
Unknown
Rock
Gneiss (Metamorphic Cobble)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Greenschist
Greenschist facies rock (containing chlorite, actinolite, albite, and epidote)
metamorphic
Gneiss
Gneissic Metamorphic Rock
metamorphic
Rough Quartz (or Quartzite pebble)
Silicon Dioxide (SiO2)
mineral
Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Gneiss
Gneiss (high-grade metamorphic rock typically composed of quartz, feldspar, and mica)
metamorphic
Labradorite (tumbled)
Labradorite (a plagioclase feldspar mineral between anorthite and albite; chemical formula: (Ca,Na)(Si,Al)4O8)
Mineral
Sandstone (Arkose)
Arkose Sandstone (principally SiO2 with Feldspar)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) - variety of Chalcedony
sedimentary
Quartz (likely Rose Quartz or Milky Quartz based on color)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartz
SiO₂ (Silicon Dioxide)
Mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Quartz Crystal (specifically a small Clear Quartz point)
Silicon Dioxide (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Greenstone / Graywacke
Metagraywacke (Chlorite-grade schistose rock)
metamorphic
Yellow Agate
Chalcedony (cryptocrystalline Quartz), SiO2
mineral
Gneiss
Gneiss
metamorphic
Chalcedony (Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Carnelian
Carnelian Agate (Silica: SiO2)
mineral
Pyrite (Iron Pyrite)
Iron Sulfide (FeS2)
mineral
Granite Gneiss
High-grade regional metamorphic rock (Quartz-Feldspar Gneiss)
metamorphic
Agate Geode
Cryptocrystalline Quartz (SiO2)
mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Gneiss (Granitic Gneiss)
Gneiss (from German Gneis, related to 'spark')
metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Hematite
Hematite (Fe2O3)
mineral
Fluorite (Rainbow Fluorite Point)
Calcium Fluoride (CaF2)
mineral