Rock Identifier

Category

Organic Mineraloid And Mineral

Browse organic mineraloid and mineral specimens identified by the Rock Identifier community.

Chert with Quartz Veins (Microcrystalline Quartz (SiO2)) — sedimentary

Chert with Quartz Veins

Microcrystalline Quartz (SiO2)

Fossilized Shark Tooth (Scapanorhynchus (Sand Tiger Shark relative)) — sedimentary

Fossilized Shark Tooth

Scapanorhynchus (Sand Tiger Shark relative)

Goldstone (Brown/Gold variety) (Aventurine Glass (SiO2 with Copper inclusions)) — Synthetic/Man-made glass (often mistaken for a mineral)

Goldstone (Brown/Gold variety)

Aventurine Glass (SiO2 with Copper inclusions)

Synthetic/Man-made glass (often mistaken for a mineral)

Pyrite in Shale (Iron Sulfide (FeS2) in Sedimentary Matrix) — mineral

Pyrite in Shale

Iron Sulfide (FeS2) in Sedimentary Matrix

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

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Mother of Pearl (Nacre) (Nacre (Aragonite/Conchiolin), CaCO3 + Organic Polymers) — mineral

Mother of Pearl (Nacre)

Nacre (Aragonite/Conchiolin), CaCO3 + Organic Polymers

Chert (Mudstone) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Mudstone)

Microcrystalline Quartz (SiO2)

Aragonite (Star Cluster or Twinned variety) (Aragonite (Calcium Carbonate, CaCO3)) — mineral

Aragonite (Star Cluster or Twinned variety)

Aragonite (Calcium Carbonate, CaCO3)

Amber (Dark/Black Variety) (Succinite (Resinite), C10H16O) — mineral

Amber (Dark/Black Variety)

Succinite (Resinite), C10H16O

Amber (Rough Baltics/Beach Specimen) (Succinicum (Organic Gemstone - Fossilized Resin)) — mineral

Amber (Rough Baltics/Beach Specimen)

Succinicum (Organic Gemstone - Fossilized Resin)

Chert (specifically Brown Chert or Jasper) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (specifically Brown Chert or Jasper)

Microcrystalline Quartz (SiO2)

Columnar Calcite / Satin Spar (Calcite (Calcium Carbonate, CaCO3)) — mineral

Columnar Calcite / Satin Spar

Calcite (Calcium Carbonate, CaCO3)

Graphite (Graphite (Native Carbon), Formula: C) — Metamorphic

Graphite

Graphite (Native Carbon), Formula: C

Ammonite Fossil (Ammonoidea (subclass)) — sedimentary

Ammonite Fossil

Ammonoidea (subclass)

Granite and Igneous Mix (Phaneritic Felsic to Mafic Intrusive Rocks) — igneous

Granite and Igneous Mix

Phaneritic Felsic to Mafic Intrusive Rocks

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

Yellow Chert (Jasper)

Silicon Dioxide (SiO2)

Shale with Pyrite (Clastic sedimentary rock containing Iron Disulfide (FeS2)) — sedimentary

Shale with Pyrite

Clastic sedimentary rock containing Iron Disulfide (FeS2)

Chert (Flint) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

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

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (with Quartz vein/coating) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (with Quartz vein/coating)

Microcrystalline Quartz (SiO2)

Sandstone (lithic) (Lithic Wacke / Arenite) — sedimentary

Sandstone (lithic)

Lithic Wacke / Arenite

Druzy Quartz (on Quartzite or Chert) (Silicon Dioxide (SiO2)) — mineral

Druzy Quartz (on Quartzite or Chert)

Silicon Dioxide (SiO2)

Coquina / Shelly Limestone (Coquina (calcium carbonate, CaCO3)) — sedimentary

Coquina / Shelly Limestone

Coquina (calcium carbonate, CaCO3)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Chert (Gray Chalcedony) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Gray Chalcedony)

Microcrystalline Quartz (SiO2)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood (Silicified wood (Quartz/Chalcedony replacement) SiO2) — sedimentary

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement) SiO2

Petrified Wood (Silicified Wood (primarily Chalcedony/Quartz, SiO2)) — sedimentary

Petrified Wood

Silicified Wood (primarily Chalcedony/Quartz, SiO2)

Ammonite Fossil (Ammonoidea (Calcium carbonate - CaCO3)) — sedimentary

Ammonite Fossil

Ammonoidea (Calcium carbonate - CaCO3)

Tufa (Calcareous Tufa (Calcium Carbonate, CaCO3)) — sedimentary

Tufa

Calcareous Tufa (Calcium Carbonate, CaCO3)

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

Petrified Wood

Silicified Wood (primarily SiO2)

Petrified Wood (Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)) — sedimentary

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)

Petrified Wood (Silicified Wood (SiO2)) — metamorphic

Petrified Wood

Silicified Wood (SiO2)

Labradorite ((Ca, Na)(Al, Si)4O8) — mineral

Labradorite

(Ca, Na)(Al, Si)4O8

Honey Calcite (Calcium Carbonate (CaCO3)) — mineral

Honey Calcite

Calcium Carbonate (CaCO3)

K2 Jasper (K2 Granite) (Azurite in Granite (Al2Cu3(CO3)2(OH)2 in NaAlSi3O8)) — igneous

K2 Jasper (K2 Granite)

Azurite in Granite (Al2Cu3(CO3)2(OH)2 in NaAlSi3O8)

Jasper with Manganese Dendrites (Silicon Dioxide (SiO2) with Oxide Mineral Inclusions) — sedimentary

Jasper with Manganese Dendrites

Silicon Dioxide (SiO2) with Oxide Mineral Inclusions

Green Aventurine (Aventurine Quartz (SiO2 + Muscovite/Fuchsite)) — metamorphic

Green Aventurine

Aventurine Quartz (SiO2 + Muscovite/Fuchsite)

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

Mookaite Jasper

Silicified Radiolarite (SiO2 with impurities)

Blue Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of asbestiform silicates)) — mineral

Blue Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of asbestiform silicates)

Red Jasper (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Zoisite with Ruby (Anyolite (Ca2Al3(SiO4)3(OH) with Al2O3:Cr)) — metamorphic

Zoisite with Ruby

Anyolite (Ca2Al3(SiO4)3(OH) with Al2O3:Cr)