Rock Identifier

Category

Organic (Anthropogenic)

Browse organic (anthropogenic) specimens identified by the Rock Identifier community.

Chert (varieties include Flint or Jasper) (Chert (cryptocrystalline quartz; SiO₂)) — Sedimentary

Chert (varieties include Flint or Jasper)

Chert (cryptocrystalline quartz; SiO₂)

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

Talc

Talc (Mg₃Si₄O₁₀(OH)₂)

Mineral
Chert (Flint) (Chert (microcrystalline quartz)) — sedimentary

Chert (Flint)

Chert (microcrystalline quartz)

sedimentary
Calcite (Calcite (Calcium Carbonate, CaCO3)) — mineral

Calcite

Calcite (Calcium Carbonate, CaCO3)

mineral
Chert (or Flint) (SiO2 (predominantly microcrystalline quartz)) — Sedimentary

Chert (or Flint)

SiO2 (predominantly microcrystalline quartz)

Sedimentary
Biotite Schist (Biotite Schist) — Metamorphic

Biotite Schist

Biotite Schist

Metamorphic
Granite (Granite (a plutonic igneous rock)) — Igneous

Granite

Granite (a plutonic igneous rock)

Igneous
Granite (Granite) — igneous

Granite

Granite

igneous
Granite (Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)) — igneous

Granite

Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)

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

Chert (Flint)

Chert (predominantly SiO₂ - silicon dioxide)

sedimentary
Calcite (Calcite (CaCO 3)) — Mineral

Calcite

Calcite (CaCO 3)

Mineral
Calcite (Calcite (CaCO3)) — Mineral

Calcite

Calcite (CaCO3)

Mineral
Banded Iron Formation (BIF) (Banded Iron Formation) — Sedimentary

Banded Iron Formation (BIF)

Banded Iron Formation

Sedimentary
Gold (Aurum (Elemental Gold, Au)) — Mineral, Metal (element)

Gold

Aurum (Elemental Gold, Au)

Mineral, Metal (element)
Granite (Granite (a common name for a felsic intrusive igneous rock)) — Igneous Rock

Granite

Granite (a common name for a felsic intrusive igneous rock)

Igneous Rock
Granite (Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)) — igneous

Granite

Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)

igneous
Mookaite Jasper (Siliceous sedimentary rock (variety of Jasper/Chert)) — Sedimentary Rock

Mookaite Jasper

Siliceous sedimentary rock (variety of Jasper/Chert)

Sedimentary Rock
Granite (Granite (a felsic intrusive igneous rock)) — Igneous rock

Granite

Granite (a felsic intrusive igneous rock)

Igneous rock
Granite (Granite (a felsic intrusive igneous rock)) — igneous

Granite

Granite (a felsic intrusive igneous rock)

igneous
Granite (Granite (a common term for a felsic intrusive igneous rock)) — igneous

Granite

Granite (a common term for a felsic intrusive igneous rock)

igneous
Banded Gneiss (Gneiss (pronounced "nice")) — metamorphic

Banded Gneiss

Gneiss (pronounced "nice")

metamorphic
Sulfur on Aragonite (Sulfur (S) and Aragonite (CaCO3)) — Mineral

Sulfur on Aragonite

Sulfur (S) and Aragonite (CaCO3)

Mineral
Chert (or Flint) (Silicon dioxide (SiO2)) — sedimentary

Chert (or Flint)

Silicon dioxide (SiO2)

sedimentary
Calcite (Calcite (CaCO3)) — mineral

Calcite

Calcite (CaCO3)

mineral
Chert Pebble (Jasperoid/Flint) (Silicon Dioxide (SiO2) - cryptocrystalline quartz) — Sedimentary

Chert Pebble (Jasperoid/Flint)

Silicon Dioxide (SiO2) - cryptocrystalline quartz

Sedimentary
Chert Pebble/Nodule (Chert (a microcrystalline or cryptocrystalline sedimentary form of quartz, SiO2)) — Sedimentary

Chert Pebble/Nodule

Chert (a microcrystalline or cryptocrystalline sedimentary form of quartz, SiO2)

Sedimentary
Black Chert (Chert (microcrystalline quartz)) — Mineral

Black Chert

Chert (microcrystalline quartz)

Mineral
Chert or Flint (polished/water-worn) (Chert (a microcrystalline or cryptocrystalline variety of quartz, SiO2). Flint is a specific variety of chert.) — Sedimentary (most likely, as Chert is a sedimentary rock often found as nodules in limestone or as bedded deposits; however, it can also form by metasomatic replacement, which leans towards metamorphic processes under certain conditions)

Chert or Flint (polished/water-worn)

Chert (a microcrystalline or cryptocrystalline variety of quartz, SiO2). Flint is a specific variety of chert.

Sedimentary (most likely, as Chert is a sedimentary rock often found as nodules in limestone or as bedded deposits; however, it can also form by metasomatic replacement, which leans towards metamorphic processes under certain conditions)
Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone) (Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)) — Metamorphic

Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)

Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)

Metamorphic
Granite (Granite (a felsic intrusive igneous rock composed primarily of quartz, feldspar, and mica)) — igneous

Granite

Granite (a felsic intrusive igneous rock composed primarily of quartz, feldspar, and mica)

igneous
Chert (or possibly Flint) (SiO2 (Silicon Dioxide)) — Sedimentary Rock

Chert (or possibly Flint)

SiO2 (Silicon Dioxide)

Sedimentary Rock
Chert (Jasper Variant likely) (Silicon Dioxide (SiO2)) — Sedimentary Rock or Mineral (depending on origin and purity)

Chert (Jasper Variant likely)

Silicon Dioxide (SiO2)

Sedimentary Rock or Mineral (depending on origin and purity)
Fossil Coral (Fossilized Scleractinia or Tabulata (various genera/species)) — Sedimentary

Fossil Coral

Fossilized Scleractinia or Tabulata (various genera/species)

Sedimentary
Serpentine Schist with Quartz Vein (Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).) — Metamorphic

Serpentine Schist with Quartz Vein

Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).

Metamorphic
Banded Iron Formation (Banded Iron Formation (BIF)) — Sedimentary

Banded Iron Formation

Banded Iron Formation (BIF)

Sedimentary
Quartzite (Quartzite (primarily composed of SiO O₂)) — Sedimentary Rock

Quartzite

Quartzite (primarily composed of SiO O₂)

Sedimentary Rock
Quartz (chalcedony variety) or Limestone with Quartz Veins (SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)) — Mineral or Sedimentary Rock (with mineral inclusions)

Quartz (chalcedony variety) or Limestone with Quartz Veins

SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)

Mineral or Sedimentary Rock (with mineral inclusions)