Rock Identifier

Category

Mineraloid (Man Made)

Browse mineraloid (man made) specimens identified by the Rock Identifier community.

Granite (Granite (Mainly Quartz SiO2, K-Feldspar KAlSi3O8, and Plagioclase)) — igneous

Granite

Granite (Mainly Quartz SiO2, K-Feldspar KAlSi3O8, and Plagioclase)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Sandstone (River Cobble) (Clastic sedimentary rock (primarily SiO2 with various lithic fragments)) — sedimentary

Sandstone (River Cobble)

Clastic sedimentary rock (primarily SiO2 with various lithic fragments)

Quartzite (Iron-stained) (Quartzite (SiO2 with iron oxides)) — metamorphic

Quartzite (Iron-stained)

Quartzite (SiO2 with iron oxides)

Granite (Phaneritic Felsic Igneous Rock) — igneous

Granite

Phaneritic Felsic Igneous Rock

Hypersthene (or Enstatite/Ferrosilite) (Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)) — Mineral

Hypersthene (or Enstatite/Ferrosilite)

Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)

Granite (Granite (Felsic intrusive igneous rock)) — igneous

Granite

Granite (Felsic intrusive igneous rock)

Sandstone Chert/Quartzite (Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite) — sedimentary

Sandstone Chert/Quartzite

Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite

Chalcedony (Common Opal/Chert variety) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Common Opal/Chert variety)

Silicon Dioxide (SiO2)

Pebble (likely Quartz or Chert) (SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.) — Sedimentary Rock

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Sedimentary Rock

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Granite (Granite (Phaneritic Quartz-Feldspar Felsic Rock)) — igneous

Granite

Granite (Phaneritic Quartz-Feldspar Felsic Rock)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Chrysoprase (Chrysoprase (a variety of Chalcedony, SiO₂)) — Mineral

Chrysoprase

Chrysoprase (a variety of Chalcedony, SiO₂)

Serpentine (Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)) — metamorphic

Serpentine

Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Quartz (Quartz (SiO₂ - Silicon Dioxide)) — Mineral

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Quartz (Rock Crystal) (Quartz (SiO₂ - Silicon Dioxide)) — Mineral

Quartz (Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Quartz (Silicon Dioxide (SiO₂)) — Mineral

Quartz

Silicon Dioxide (SiO₂)

Quartz (Quartz (SiO₂ - Silicon Dioxide)) — Mineral

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Quartz (likely macrocrystalline variety) (Quartz (SiO₂)) — Mineral

Quartz (likely macrocrystalline variety)

Quartz (SiO₂)

Granite (Granite (a common rock type, not a single mineral species)) — Igneous

Granite

Granite (a common rock type, not a single mineral species)

Quartz (Quartz (SiO₂)) — Mineral

Quartz

Quartz (SiO₂)

Sandstone (Sandstone (lithified sand)) — sedimentary

Sandstone

Sandstone (lithified sand)

Sandstone (Arenite (general term for sandstone)) — Sedimentary Rock

Sandstone

Arenite (general term for sandstone)

Sedimentary Rock

Quartz (SiO₂ (Silicon Dioxide)) — Mineral

Quartz

SiO₂ (Silicon Dioxide)

Quartz (likely Milky Quartz or Chalcedony) (Quartz (SiO2 - Silicon Dioxide)) — Mineral

Quartz (likely Milky Quartz or Chalcedony)

Quartz (SiO2 - Silicon Dioxide)

Sandstone (Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)) — Sedimentary Rock

Sandstone

Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)

Sedimentary Rock

Jasper (yellow/cream variety) (SiO₂ (Cryptocrystalline Quartz)) — Sedimentary

Jasper (yellow/cream variety)

SiO₂ (Cryptocrystalline Quartz)

Quartz (Quartz (SiO₂)) — Mineral

Quartz

Quartz (SiO₂)

Talc (Talc (Mg₃Si₄O₁₀(OH)₂)) — Mineral

Talc

Talc (Mg₃Si₄O₁₀(OH)₂)

Quartzite (Quartzite (primarily SiO2)) — Metamorphic

Quartzite

Quartzite (primarily SiO2)

Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen) (Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.) — Metamorphic, Mineral (within a rock type)

Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)

Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.

Metamorphic, Mineral (within a rock type)

Quartz (Quartz (SiO2 - Silicon Dioxide)) — Mineral

Quartz

Quartz (SiO2 - Silicon Dioxide)

Quartz (Quartz (SiO2 - Silicon Dioxide)) — Mineral

Quartz

Quartz (SiO2 - Silicon Dioxide)

Chert (Flint) (Chert (predominantly SiO₂ - silicon dioxide)) — sedimentary

Chert (Flint)

Chert (predominantly SiO₂ - silicon dioxide)

Quartz (possibly milky quartz) (Quartz (Silica; SiO₂)) — Mineral

Quartz (possibly milky quartz)

Quartz (Silica; SiO₂)