Rock Identifier

Category

Organic (Mineraloid)

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

Greywacke with Quartz Vein (Matrix: Impure Sandstone (SiO2 + varied clasts), Veins: Quartz (SiO2)) — sedimentary

Greywacke with Quartz Vein

Matrix: Impure Sandstone (SiO2 + varied clasts), Veins: Quartz (SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Green Schist (Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)) — metamorphic

Green Schist

Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)

Eclogite garnet in matrix (Eclogite (Garnet-Omphacite rock)) — metamorphic

Eclogite garnet in matrix

Eclogite (Garnet-Omphacite rock)

Tiger's Eye (with Hematite/Jasper) (SiO2 (Silicon Dioxide) with Fe2O3 (Hematite)) — mineralogical

Tiger's Eye (with Hematite/Jasper)

SiO2 (Silicon Dioxide) with Fe2O3 (Hematite)

Pegmatite (likely Granitic Pegmatite) (Pegmatite (a coarse-grained igneous rock, often with granitic composition)) — igneous

Pegmatite (likely Granitic Pegmatite)

Pegmatite (a coarse-grained igneous rock, often with granitic composition)

Schist (Mica Schist) — metamorphic

Schist

Mica Schist

Quartzite (Quartzite) — metamorphic

Quartzite

Quartzite

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

Hag Stone (Perforated Sedimentary Rock (primarily Siltstone or Mudstone)) — sedimentary

Hag Stone

Perforated Sedimentary Rock (primarily Siltstone or Mudstone)

Greisen (Greisen) — Metamorphic

Greisen

Greisen

Diorite (Diorite (Intermediate plutonic rock)) — igneous

Diorite

Diorite (Intermediate plutonic rock)

Quartz (Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Hypersthene ((Mg,Fe)SiO3 - Enstatite-Ferrosilite series) — mineral

Hypersthene

(Mg,Fe)SiO3 - Enstatite-Ferrosilite series

Chert (specifically Silex or Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (specifically Silex or Flint)

Microcrystalline Quartz (SiO2)

Pink Aragonite (CaCO3) — mineral

Pink Aragonite

CaCO3

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Chalk (Calcium Carbonate (CaCO3)) — sedimentary

Chalk

Calcium Carbonate (CaCO3)

Fossilized Syringopora (Piping Organ Coral) (Syringopora (Extinct Genus of Tabulate Coral)) — sedimentary

Fossilized Syringopora (Piping Organ Coral)

Syringopora (Extinct Genus of Tabulate Coral)

Stromatolite (Stromatolite (Cyanobacteria-formed Organo-sedimentary structure)) — sedimentary

Stromatolite

Stromatolite (Cyanobacteria-formed Organo-sedimentary structure)

Limestone Fragment (Sedimentary rock (primarily Calcium Carbonate, CaCO3)) — sedimentary

Limestone Fragment

Sedimentary rock (primarily Calcium Carbonate, CaCO3)

Quartz Vein in Host Rock (Gneiss/Schist) (Silicon Dioxide (SiO2) within a metamorphic matrix) — metamorphic

Quartz Vein in Host Rock (Gneiss/Schist)

Silicon Dioxide (SiO2) within a metamorphic matrix

Crushed Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Crushed Limestone

Calcium Carbonate (CaCO3)

Limestone Pebble (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone Pebble

Sedimentary Calcium Carbonate (CaCO3)

Chert / Fossiliferous Limestone (Sedimentary Chert (often containing CaCO3 or SiO2 replacements)) — sedimentary

Chert / Fossiliferous Limestone

Sedimentary Chert (often containing CaCO3 or SiO2 replacements)

Limestone with Chert (Calcium Carbonate (CaCO3) with Silica (SiO2) inclusions) — sedimentary

Limestone with Chert

Calcium Carbonate (CaCO3) with Silica (SiO2) inclusions

Fossilized Bivalve Shell (Bivalvia (fossil specimen)) — sedimentary

Fossilized Bivalve Shell

Bivalvia (fossil specimen)

Chert (Chert (microcrystalline quartz, SiO2)) — sedimentary

Chert

Chert (microcrystalline quartz, SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Pearl (Calcium Carbonate (Aragonite) - CaCO3) — mineral

Pearl

Calcium Carbonate (Aragonite) - CaCO3

Brain Coral Fossil (Family Mussidae or Merulinidae (Order Scleractinia)) — sedimentary

Brain Coral Fossil

Family Mussidae or Merulinidae (Order Scleractinia)

Fossiliferous Limestone (Calcium carbonate (CaCO3) with marine fossils) — sedimentary

Fossiliferous Limestone

Calcium carbonate (CaCO3) with marine fossils

Limestone (Calcareous sedimentary rock (primarily CaCO3)) — sedimentary

Limestone

Calcareous sedimentary rock (primarily CaCO3)

Chert (containing a small fossil) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (containing a small fossil)

Microcrystalline Quartz (SiO2)

Fossilized Solitary Rugose Coral (Order Rugosa (commonly Horn Coral)) — sedimentary

Fossilized Solitary Rugose Coral

Order Rugosa (commonly Horn Coral)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Pearl (Aragonite (CaCO3) with Conchiolin) — mineral

Pearl

Aragonite (CaCO3) with Conchiolin

Horn Coral Fossil (Rugosa (Order Rugosa)) — sedimentary

Horn Coral Fossil

Rugosa (Order Rugosa)

Banded Gneiss (Gneiss (pronounced 'nice')) — metamorphic

Banded Gneiss

Gneiss (pronounced 'nice')

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Limestone (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Pearl (Calcium Carbonate (primarily Aragonite and Calcite), CaCO3) — mineral

Pearl

Calcium Carbonate (primarily Aragonite and Calcite), CaCO3