Rock Identifier

Category

Mineral Or Sedimentary (If Chert)

Browse mineral or sedimentary (if chert) specimens identified by the Rock Identifier community.

Shale (Shale (clastic sedimentary rock)) — Sedimentary

Shale

Shale (clastic sedimentary rock)

Megalodon Shark Tooth Fossil (Otodus megalodon (fossilized in sedimentary matrix)) — sedimentary

Megalodon Shark Tooth Fossil

Otodus megalodon (fossilized in sedimentary matrix)

Ironstone Concretion (Moqui Marble variety) (Ferruginous Sandstone Concretion) — sedimentary

Ironstone Concretion (Moqui Marble variety)

Ferruginous Sandstone Concretion

African Turquoise (African Turquoise (a trade name for Jasper, a variety of Chalcedony: SiO2)) — sedimentary

African Turquoise

African Turquoise (a trade name for Jasper, a variety of Chalcedony: SiO2)

Red Jasper (Silicon Dioxide (SiO2) with Hematite inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Yellow Jasper (Silicon Dioxide (SiO2) with Goethite/Iron inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron inclusions

Geode (unopened) (Calcedony-lined Geode (SiO2)) — sedimentary

Geode (unopened)

Calcedony-lined Geode (SiO2)

Gneiss (Gneiss (High-grade metamorphic rock)) — metamorphic

Gneiss

Gneiss (High-grade metamorphic rock)

Fossilized Shark Tooth (Fossil Chondrichthyes (various genera such as Carcharias or Odontaspis)) — sedimentary

Fossilized Shark Tooth

Fossil Chondrichthyes (various genera such as Carcharias or Odontaspis)

Hematite (Ferric oxide (Fe2O3)) — mineral

Hematite

Ferric oxide (Fe2O3)

Limonite (Iron Ore) (Limonite (FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Concretion (Septarian concretion (likely containing Calcite or Siderite)) — sedimentary

Concretion

Septarian concretion (likely containing Calcite or Siderite)

Tiger's Eye, Hematite, and Black Obsidian Bracelet (SiO2 (Tiger's Eye), Fe2O3 (Hematite), and 70-75% SiO2 (Obsidian)) — mineral

Tiger's Eye, Hematite, and Black Obsidian Bracelet

SiO2 (Tiger's Eye), Fe2O3 (Hematite), and 70-75% SiO2 (Obsidian)

Banded Calcite (often sold as Caribbean Calcite or Honey Calcite) (Calcium Carbonate (CaCO3)) — mineral

Banded Calcite (often sold as Caribbean Calcite or Honey Calcite)

Calcium Carbonate (CaCO3)

Satin Spar (Selenite) (Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O) — mineral

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Biotite (Black Mica) (Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2) — mineral

Biotite (Black Mica)

Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2

Grey Chalcedony (Tumbled Moon) (Microcrystalline Quartz (SiO2)) — mineral

Grey Chalcedony (Tumbled Moon)

Microcrystalline Quartz (SiO2)

Hematite (Hematite (Fe2O3)) — mineral

Hematite

Hematite (Fe2O3)

River Rock (likely Siltstone or fine-grained Sandstone) (Clastic Sedimentary Rock) — sedimentary

River Rock (likely Siltstone or fine-grained Sandstone)

Clastic Sedimentary Rock

Quartz Geode with Chalcedony (Crystalline Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode with Chalcedony

Crystalline Silicon Dioxide (SiO2)

Quartz Geode (Crystalline Silicon Dioxide (SiO2) in Geode form) — sedimentary

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in Geode form

Quartz Geode (Crystalline Silicon Dioxide (SiO2) in Geode form) — sedimentary

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in Geode form

Fancy Jasper (Ocean Jasper or River Jasper variant) (Silicon Dioxide with inclusions (SiO2)) — sedimentary

Fancy Jasper (Ocean Jasper or River Jasper variant)

Silicon Dioxide with inclusions (SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2)

Quartz on Schist (Silicon Dioxide (SiO2) on Foliated Metamorphic Rock) — metamorphic

Quartz on Schist

Silicon Dioxide (SiO2) on Foliated Metamorphic Rock

Red Sandstone (Arenite (primarily Quartz with Iron Oxide coating)) — sedimentary

Red Sandstone

Arenite (primarily Quartz with Iron Oxide coating)

Lazulite (Lazulite (MgAl2(PO4)2(OH)2)) — mineral

Lazulite

Lazulite (MgAl2(PO4)2(OH)2)

Sandstone (Ferruginous) (Arenite (primarily SiO2 with Fe2O3 cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 cement)

Sandstone (Arenite (SiO2 principal)) — sedimentary

Sandstone

Arenite (SiO2 principal)

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

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Fancy Jasper (Silicon Dioxide (SiO2) with mineral inclusions) — sedimentary

Fancy Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Quartz (Small Fragment) (Silicon Dioxide (SiO2)) — mineral

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Sandstone (Quartzite-rich Cobble) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (Quartzite-rich Cobble)

Clastic sedimentary rock (primarily SiO2)

Breciated Limestone with Calcite Veins (Sedimentary Breccia (CaCO3)) — sedimentary

Breciated Limestone with Calcite Veins

Sedimentary Breccia (CaCO3)

Sandstone Pebble (Arenite (primarily SiO2)) — sedimentary

Sandstone Pebble

Arenite (primarily SiO2)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Sandstone (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Sandstone (likely Arkose or Quartz Sandstone) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (likely Arkose or Quartz Sandstone)

Clastic sedimentary rock (primarily SiO2)

Turquoise (Hydrate phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise

Hydrate phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O

Blue Chalcedony (Cryptocrystalline Silicon Dioxide (SiO2)) — mineral

Blue Chalcedony

Cryptocrystalline Silicon Dioxide (SiO2)

Pyrite-rich Gossan (Iron Sulfide (FeS2) in Ore Matrix) — mineral

Pyrite-rich Gossan

Iron Sulfide (FeS2) in Ore Matrix