Rock Identifier

Category

Mineraloid (Human Made Geological Specimen)

Browse mineraloid (human made geological specimen) specimens identified by the Rock Identifier community.

Milky Quartz (with potential inclusion) (Silicon Dioxide (SiO2)) — mineral

Milky Quartz (with potential inclusion)

Silicon Dioxide (SiO2)

Quartz / Common Agate (Silicon Dioxide (SiO2)) — mineral

Quartz / Common Agate

Silicon Dioxide (SiO2)

Quartz Crystal (specifically a milky or semi-translucent single crystal point) (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal (specifically a milky or semi-translucent single crystal point)

Silicon Dioxide (SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Pyrite (Iron Disulfide (FeS2)) — mineral

Pyrite

Iron Disulfide (FeS2)

Pyrite (Fools Gold) (Iron Sulfide (FeS2)) — mineral

Pyrite (Fools Gold)

Iron Sulfide (FeS2)

Quartz (Milky Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Himalayan Salt (Halite (mineral name), chemical formula NaCl (sodium chloride). Generally, 'Himalayan Salt' is a trade name for evaporite minerals from specific regions.) — Mineral

Himalayan Salt

Halite (mineral name), chemical formula NaCl (sodium chloride). Generally, 'Himalayan Salt' is a trade name for evaporite minerals from specific regions.

Chert (Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Quartz (SiO2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Petrified Wood (Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)) — metamorphic

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)

Granite (Phaneritic Felsic Intrusive Igneous Rock) — igneous

Granite

Phaneritic Felsic Intrusive Igneous Rock

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Sandstone Cobble with Liesegang Rings (Arenite with iron oxide precipitation (SiO2 matrix with Fe2O3 banding)) — sedimentary

Sandstone Cobble with Liesegang Rings

Arenite with iron oxide precipitation (SiO2 matrix with Fe2O3 banding)

Quartzite (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Milky Quartz with Iron Staining (Silicon Dioxide (SiO2)) — mineral

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Breciated Jasper (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartz (Smoky or Clear variety with inclusions) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky or Clear variety with inclusions)

Silicon Dioxide (SiO2)

Quartz (in matrix) (Quartz (SiO₂)) — mineral

Quartz (in matrix)

Quartz (SiO₂)

Quartz with Mica inclusions (likely Schist or Gneiss host) (Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)) — metamorphic

Quartz with Mica inclusions (likely Schist or Gneiss host)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)

Chert (often called Flint when dark) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Basalt with Vesicular Texture (Beach Cobble) (Vesicular Basalt (Aphanitic Igneous Rock)) — igneous

Basalt with Vesicular Texture (Beach Cobble)

Vesicular Basalt (Aphanitic Igneous Rock)

Chert (varieties include Flint and Jasper) (Silicon Dioxide (SiO2)) — sedimentary

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2)

Green Aventurine (Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2AlSi3O10(OH)2)) — metamorphic

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2AlSi3O10(OH)2)

Amethyst (Crystalline Quartz (SiO2 with iron impurities)) — mineral

Amethyst

Crystalline Quartz (SiO2 with iron impurities)

Amazonite (Amazonite (KAlSi3O8, a variety of Microcline)) — mineral

Amazonite

Amazonite (KAlSi3O8, a variety of Microcline)

Jasper and Agate (Polished Pebble) (Chalcedony (SiO2 with impurities)) — Sedimentary

Jasper and Agate (Polished Pebble)

Chalcedony (SiO2 with impurities)

Mica Schist (Mica Schist (primarily Muscovite or Biotite sheet silicates)) — metamorphic

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

Quartz (Milky or Smoky Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky or Smoky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz Sphere (Silicon Dioxide (SiO2)) — mineral

Clear Quartz Sphere

Silicon Dioxide (SiO2)

Agate (River Pea) (Microcrystalline Chalcedony (SiO2)) — sedimentary

Agate (River Pea)

Microcrystalline Chalcedony (SiO2)

Sandstone (likely Arkosic or Quartzose) (Sandstone (SiO2 with inclusions)) — sedimentary

Sandstone (likely Arkosic or Quartzose)

Sandstone (SiO2 with inclusions)

Sandstone (Yellow/Tan) (Clastic sedimentary rock (primarily SiO2 with iron oxide staining)) — sedimentary

Sandstone (Yellow/Tan)

Clastic sedimentary rock (primarily SiO2 with iron oxide staining)

Granite (Phaneritic Felsic Intrusive Igneous Rock) — igneous

Granite

Phaneritic Felsic Intrusive Igneous Rock

Quartz (Iron-stained) (Silicon Dioxide (SiO2) with Hematite/Limonite impurities) — mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Massive Quartz (Silicon Dioxide (SiO2)) — mineral

Massive Quartz

Silicon Dioxide (SiO2)

Quartz (Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz (Quartz (SiO₂)) — Mineral

Quartz

Quartz (SiO₂)

Common Opal (Hydrated silica (SiO2 " nH2O)) — mineral

Common Opal

Hydrated silica (SiO2 " nH2O)

Milky Quartz (with potential inclusion of feldspar) (Silicon Dioxide (SiO2)) — Mineral

Milky Quartz (with potential inclusion of feldspar)

Silicon Dioxide (SiO2)