Rock Identifier

Category

Mineral (Sedimentary Context)

Browse mineral (sedimentary context) specimens identified by the Rock Identifier community.

Pyrite (Fool's Gold) (Iron Sulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Sandstone (Arenite (Siliclastic sedimentary rock)) — sedimentary

Sandstone

Arenite (Siliclastic sedimentary rock)

Mixed Quartz and Jasper Pebbles (Silicon Dioxide (SiO2)) — Mineral

Mixed Quartz and Jasper Pebbles

Silicon Dioxide (SiO2)

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

Quartz (Milky Quartz)

Quartz (SiO2 - Silicon Dioxide)

Gneiss (Gneiss (High-grade Metamorphic Rock)) — metamorphic

Gneiss

Gneiss (High-grade Metamorphic Rock)

Sandstone (Ferruginous) (Arenite (Fe-rich)) — sedimentary

Sandstone (Ferruginous)

Arenite (Fe-rich)

Chert (Chalcedony/Agate) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Chalcedony/Agate)

Microcrystalline Quartz (SiO2)

Gneiss (Metamorphic rock of high-grade regional metamorphism) — metamorphic

Gneiss

Metamorphic rock of high-grade regional metamorphism

Slate (Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.) — sedimentary

Slate

Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.

Yellow Chert (Jasper) (Silicon Dioxide (SiO2)) — sedimentary

Yellow Chert (Jasper)

Silicon Dioxide (SiO2)

Septarian Nodule or Mud Crack Fossil (Septarian Nodule (Concretion)) — sedimentary

Septarian Nodule or Mud Crack Fossil

Septarian Nodule (Concretion)

Chert (specifically Tan Chert) (Chert (SiO2)) — sedimentary

Chert (specifically Tan Chert)

Chert (SiO2)

Moss Agate (Agate (Silicon Dioxide, SiO2) with dendritic inclusions) — sedimentary

Moss Agate

Agate (Silicon Dioxide, SiO2) with dendritic inclusions

Black Sand (Magnetite Sand) (Magnetite-rich Placers (Fe3O4)) — sedimentary

Black Sand (Magnetite Sand)

Magnetite-rich Placers (Fe3O4)

Chert / River Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Chert / River Jasper

Microcrystalline Quartz (SiO2)

Red Jasper (Chert) (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — sedimentary

Red Jasper (Chert)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Clear Quartz (beads in a bracelet) (Quartz (SiO2)) — Mineral

Clear Quartz (beads in a bracelet)

Quartz (SiO2)

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

Gneiss

Gneiss (High-grade regional metamorphic rock)

Greenschist / Migmatite (Regional Metamorphic Complex (Facies: Greenschist to Amphibolite)) — metamorphic

Greenschist / Migmatite

Regional Metamorphic Complex (Facies: Greenschist to Amphibolite)

Sandstone (Arenite (primarily SiO2 - Silicon Dioxide)) — sedimentary

Sandstone

Arenite (primarily SiO2 - Silicon Dioxide)

Sandstone (clastic) (Clastic Sedimentary Rock (primarily composed of SiO2)) — sedimentary

Sandstone (clastic)

Clastic Sedimentary Rock (primarily composed of SiO2)

Quartz Geode (Druzy) (Crystalline Silicon Dioxide (SiO2)) — mineral

Quartz Geode (Druzy)

Crystalline Silicon Dioxide (SiO2)

Quartz Druze on Matrix (Silicon Dioxide (SiO2)) — mineral

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Sandstone (Ferruginous) (Arenite (Fe-rich)) — sedimentary

Sandstone (Ferruginous)

Arenite (Fe-rich)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Banded Calcite (often sold as Mexican Onyx or Aragonite) (Calcite/Aragonite (Calcium Carbonate, CaCO3)) — sedimentary

Banded Calcite (often sold as Mexican Onyx or Aragonite)

Calcite/Aragonite (Calcium Carbonate, CaCO3)

Sandstone (likely Quartzite-grade) (Arenite (primarily SiO2)) — sedimentary

Sandstone (likely Quartzite-grade)

Arenite (primarily SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

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)

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

Sandstone (Flagstone)

Arenite (composed primarily of SiO2)

Red Sandstone (Arkose) (Clastic Sedimentary Rock (Lithic Arkose)) — sedimentary

Red Sandstone (Arkose)

Clastic Sedimentary Rock (Lithic Arkose)

Ironstone Concretion (Pot Stone) (Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)) — sedimentary

Ironstone Concretion (Pot Stone)

Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)

Limestone with Quartz or Calcite Veining (Calcium Carbonate (CaCO3) matrix with SiO2 or CaCO3 inclusions) — sedimentary

Limestone with Quartz or Calcite Veining

Calcium Carbonate (CaCO3) matrix with SiO2 or CaCO3 inclusions

Sandstone Concretion (Moqui Marble / Iron-oxide Concretion (SiO2 with Hematite/Goethite)) — sedimentary

Sandstone Concretion

Moqui Marble / Iron-oxide Concretion (SiO2 with Hematite/Goethite)

Picture Jasper (specifically Biggs or Deschutes variety) (Silicon Dioxide (SiO2) - Cryptocrystalline Quartz) — sedimentary

Picture Jasper (specifically Biggs or Deschutes variety)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Calcite (Calcite (CaCO3)) — Mineral

Calcite

Calcite (CaCO3)

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

Quartz

Quartz (Silicon Dioxide - SiO2)

Dalmation Stone (Peralkaline Rock (mixed silicate minerals)) — igneous

Dalmation Stone

Peralkaline Rock (mixed silicate minerals)

Kyanite (Kyanite (Al2SiO5)) — Mineral

Kyanite

Kyanite (Al2SiO5)

Fossil Shark Tooth (Cretaceous white shark type) (Squalicorax (commonly known as Crow Shark)) — Organic specimen (fossil)

Fossil Shark Tooth (Cretaceous white shark type)

Squalicorax (commonly known as Crow Shark)

Organic specimen (fossil)

Almandine Garnet in Matrix (Almandine (Fe3Al2(SiO4)3)) — metamorphic

Almandine Garnet in Matrix

Almandine (Fe3Al2(SiO4)3)