Rock Identifier

Category

Organic (Mineraloid)

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

Red Quartzite / Ferruginous Quartzite (Quartzite (primarily SiO2 with Fe2O3 inclusions)) — metamorphic

Red Quartzite / Ferruginous Quartzite

Quartzite (primarily SiO2 with Fe2O3 inclusions)

Brachiopod Fossil in Chert (Phylum Brachiopoda within Microcrystalline Quartz (SiO2)) — sedimentary

Brachiopod Fossil in Chert

Phylum Brachiopoda within Microcrystalline Quartz (SiO2)

Diorite (Diorite (intermediate intrusive igneous rock)) — igneous

Diorite

Diorite (intermediate intrusive igneous rock)

Chert (Arrowhead Artifact) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Arrowhead Artifact)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Schist (specifically Chlorite/Greenschist) (Chlorite Schist) — metamorphic

Schist (specifically Chlorite/Greenschist)

Chlorite Schist

Chert (Yellow Jasper variant) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Chert / Flint (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Kyanite (Kyanite (Al2SiO5)) — mineral

Kyanite

Kyanite (Al2SiO5)

Chert (River Pebble) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (River Pebble)

Microcrystalline Quartz (SiO2)

Quartzite (River Stone) (Quartzite (SiO2)) — metamorphic

Quartzite (River Stone)

Quartzite (SiO2)

Granite Pebble (Felsic intrusive igneous rock (consisting primarily of Quartz and Feldspar)) — igneous

Granite Pebble

Felsic intrusive igneous rock (consisting primarily of Quartz and Feldspar)

Chert (Jasper/Flint variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert / Flint (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Banded Flint / Chert (Silicon Dioxide (SiO2)) — sedimentary

Banded Flint / Chert

Silicon Dioxide (SiO2)

Chert (Common Opal/Chalcedony) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Common Opal/Chalcedony)

Microcrystalline Quartz (SiO2)

Granodiorite (Granodiorite (phaneritic intrusive igneous rock)) — igneous

Granodiorite

Granodiorite (phaneritic intrusive igneous rock)

Chert (Jasper) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper)

Cryptocrystalline Quartz (SiO2)

Quartzite (River Cobble) (Quartzite (predominantly SiO2)) — metamorphic

Quartzite (River Cobble)

Quartzite (predominantly SiO2)

Chert (Jasper/Flint variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Chert (Grey Flint) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Chert (Grey Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

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

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Quartzite Pebble (Metamorphic Quartzite (primarily SiO2)) — metamorphic

Quartzite Pebble

Metamorphic Quartzite (primarily SiO2)

Greenschist (Greenschist (Chlorite-Epidote-Actinolite Schist)) — metamorphic

Greenschist

Greenschist (Chlorite-Epidote-Actinolite Schist)

Chert (Iron-stained) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Iron-stained)

Microcrystalline quartz (SiO2)

Rugose Coral (Horn Coral) Fossil in Limestone (Order Rugosa (commonly Grewingkia or Zaphrentis genus)) — sedimentary

Rugose Coral (Horn Coral) Fossil in Limestone

Order Rugosa (commonly Grewingkia or Zaphrentis genus)

Aragonite (Yellow/Honey Tumble) (Calcium Carbonate (CaCO3)) — mineral

Aragonite (Yellow/Honey Tumble)

Calcium Carbonate (CaCO3)

Chert (Yellow Jasper variant) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Mookaite Jasper (Radiolarite (Silicon Dioxide, SiO2)) — sedimentary

Mookaite Jasper

Radiolarite (Silicon Dioxide, SiO2)

Granite (Granite (Felsic Plutonic Rock / SiO2 + Al2O3 + K2O + Na2O + CaO + FeO + MgO)) — igneous

Granite

Granite (Felsic Plutonic Rock / SiO2 + Al2O3 + K2O + Na2O + CaO + FeO + MgO)

Fossiliferous Limestone (Crinoidal Limestone) (Biogenic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Fossiliferous Limestone (Crinoidal Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Greenschist (Greenstone) (Chlorite Schist / Greenschist Facies Rock) — metamorphic

Greenschist (Greenstone)

Chlorite Schist / Greenschist Facies Rock

Chert (often called Flint or Jasper) (Silicon Dioxide (SiO2)) — sedimentary

Chert (often called Flint or Jasper)

Silicon Dioxide (SiO2)

Chert (specifically a variety like Flint or River Jasper with Iron Oxidation) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (specifically a variety like Flint or River Jasper with Iron Oxidation)

Microcrystalline Quartz (SiO2)

Yellow Quartzite (River Pebble) (Quartzite (primarily SiO2)) — metamorphic

Yellow Quartzite (River Pebble)

Quartzite (primarily SiO2)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Chert (Flint/Jasper variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Fossilized Crinoid Stem (Class Crinoidea (Echinodermata)) — sedimentary

Fossilized Crinoid Stem

Class Crinoidea (Echinodermata)

Mookaite Jasper (Silicified Porcellanite (SiO2 with impurities)) — sedimentary

Mookaite Jasper

Silicified Porcellanite (SiO2 with impurities)

Chert (specifically Gray/Tan Bedded Chert) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (specifically Gray/Tan Bedded Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz (Milky Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Mica Schist (Mica Schist) — metamorphic

Mica Schist

Mica Schist

Petrified Wood (Silicified Wood (primarily SiO2)) — sedimentary

Petrified Wood

Silicified Wood (primarily SiO2)