Rock Identifier

Category

Mineral And Sedimentary

Browse mineral and sedimentary specimens identified by the Rock Identifier community.

Opal (Hydrated silica (SiO2·nH2O)) — mineraloid

Opal

Hydrated silica (SiO2·nH2O)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Sandstone (Quartzose) (Arenite (SiO2 based)) — sedimentary

Sandstone (Quartzose)

Arenite (SiO2 based)

Sandstone (Arenite (primarily SiO2 with various cementing agents)) — sedimentary

Sandstone

Arenite (primarily SiO2 with various cementing agents)

Sandstone (Calcareous Sandstone) (Calcareous Sandstone (primarily SiO2 with CaCO3 cement)) — sedimentary

Sandstone (Calcareous Sandstone)

Calcareous Sandstone (primarily SiO2 with CaCO3 cement)

Limonite and Goethite (Ironstone) (Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)) — sedimentary

Limonite and Goethite (Ironstone)

Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)

Ruby in Zoisite (Anyolite (Ruby in Zoisite)) — metamorphic

Ruby in Zoisite

Anyolite (Ruby in Zoisite)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Optical Calcite (Calcium Carbonate (CaCO3)) — mineral

Optical Calcite

Calcium Carbonate (CaCO3)

Dendritic Agate (Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)) — mineral

Dendritic Agate

Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)

Hematite (Iron(III) oxide (Fe2O3)) — mineral

Hematite

Iron(III) oxide (Fe2O3)

Rock Salt (Halite) (Halite (Sodium Chloride, NaCl)) — mineral

Rock Salt (Halite)

Halite (Sodium Chloride, NaCl)

Green Fluorite (Calcium Fluoride (CaF2)) — mineral

Green Fluorite

Calcium Fluoride (CaF2)

Jasper with Manganese Dendrites (Silicon Dioxide (SiO2) with Oxide Mineral Inclusions) — sedimentary

Jasper with Manganese Dendrites

Silicon Dioxide (SiO2) with Oxide Mineral Inclusions

Sandstone (Sandstone (clastic sedimentary rock, predominantly SiO2)) — sedimentary

Sandstone

Sandstone (clastic sedimentary rock, predominantly SiO2)

Quartz Geode (Quartz (Silicon Dioxide, SiO2) Geode) — sedimentary

Quartz Geode

Quartz (Silicon Dioxide, SiO2) Geode

Sandstone (Quartzose) (Sandstone (clastic sedimentary rock, primarily SiO2)) — sedimentary

Sandstone (Quartzose)

Sandstone (clastic sedimentary rock, primarily SiO2)

Red Sandstone (Arenite (with Iron Oxide cement)) — sedimentary

Red Sandstone

Arenite (with Iron Oxide cement)

Sandstone (Arenite (primarily Quartz, SiO2)) — sedimentary

Sandstone

Arenite (primarily Quartz, SiO2)

Sandstone (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone

Arenite (composed primarily of SiO2)

Dyed Howlite (Dyed Red) (Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)) — mineral

Dyed Howlite (Dyed Red)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Yellow Calcite (Calcium Carbonate (CaCO3)) — mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

Optical Calcite (Iceland Spar) (Calcite (CaCO3)) — mineral

Optical Calcite (Iceland Spar)

Calcite (CaCO3)

Garnet (Almandine) (Almandine, Fe3Al2Si3O12) — mineral

Garnet (Almandine)

Almandine, Fe3Al2Si3O12

Specular Hematite with Quartz and Limonite (Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)) — Mineral

Specular Hematite with Quartz and Limonite

Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)

Native Gold (in earring form) (Gold (Au)) — mineral

Native Gold (in earring form)

Gold (Au)

Calcite (Calcium Carbonate (CaCO3)) — mineral

Calcite

Calcium Carbonate (CaCO3)

Pyrite with Iron Oxides (Fool's Gold in Matrix) (Iron Sulfide (FeS2)) — mineral

Pyrite with Iron Oxides (Fool's Gold in Matrix)

Iron Sulfide (FeS2)

Specular Hematite (Polished Sphere) (Hematite (Alpha Fe2O3)) — mineral

Specular Hematite (Polished Sphere)

Hematite (Alpha Fe2O3)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Agate (Banded Chalcedony (SiO2)) — mineral

Agate

Banded Chalcedony (SiO2)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Blue Chalcedony (likely dyed Agate) (Silicon Dioxide (SiO₂)) — mineral

Blue Chalcedony (likely dyed Agate)

Silicon Dioxide (SiO₂)

Red Jasper (Tumbled) (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary/mineral

Red Jasper (Tumbled)

Silicon Dioxide (SiO2) with iron oxide inclusions

sedimentary/mineral

Hematite Nodule (Hematite (Fe2O3)) — mineral

Hematite Nodule

Hematite (Fe2O3)

Sandstone (Quartzose) (Arenite (composed mainly of SiO2)) — sedimentary

Sandstone (Quartzose)

Arenite (composed mainly of SiO2)

Sandstone (Quartzite texture) (Arenite (SiO2 secondary)) — sedimentary

Sandstone (Quartzite texture)

Arenite (SiO2 secondary)

Agate with Druzy Quartz (Silicon Dioxide (SiO2)) — mineral

Agate with Druzy Quartz

Silicon Dioxide (SiO2)

Sandstone (likely Arkose) (Arenite (Feldspathic Sandstone / Arkose)) — sedimentary

Sandstone (likely Arkose)

Arenite (Feldspathic Sandstone / Arkose)

Sandstone (likely Quartzose type) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (likely Quartzose type)

Clastic sedimentary rock (primarily SiO2)

Gneiss (Granitic Gneiss) (Gneiss (composed primarily of Quartz, Feldspar, and Mica/Amphibole)) — metamorphic

Gneiss (Granitic Gneiss)

Gneiss (composed primarily of Quartz, Feldspar, and Mica/Amphibole)

Sandstone (Quartz-rich) (Clastic sedimentary rock (SiO2 primary)) — sedimentary

Sandstone (Quartz-rich)

Clastic sedimentary rock (SiO2 primary)