Rock Identifier

Category

Organic Gemstone

Browse organic gemstone specimens identified by the Rock Identifier community.

Learn about Organic Gemstone in the encyclopedia

Jet

Jet

Sapropel

Sapropel

Red Garnet

Red Garnet

Bituminous Shale

Bituminous Shale

Black Shale

Black Shale

Petrified Wood

Petrified Wood

Amber

Amber

Peat

Peat

Oil Shale

Oil Shale

Pearl

Pearl

Lizard Skin Jasper

Lizard Skin Jasper

Rhodonite

Rhodonite

Amber with Inclusion (Succiniferous fossil resin (C10H16O)) — mineraloid

Amber with Inclusion

Succiniferous fossil resin (C10H16O)

Amber (Rough) (Amber (Fossilized Tree Resin, succinite)) — mineral

Amber (Rough)

Amber (Fossilized Tree Resin, succinite)

Chert (specifically Blue Chert or Flint) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (specifically Blue Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Pink Opal (Common Opal) (Amorphous Hydrated Silica (SiO2·nH2O)) — mineral

Pink Opal (Common Opal)

Amorphous Hydrated Silica (SiO2·nH2O)

Citrine (Silicon dioxide (SiO2) - yellow quartz variety) — mineral

Citrine

Silicon dioxide (SiO2) - yellow quartz variety

Fairburn Agate / Agate-bearing Breccia (Cryptocrystalline Quartz (SiO2) within Jasper/Breccia matrix) — sedimentary

Fairburn Agate / Agate-bearing Breccia

Cryptocrystalline Quartz (SiO2) within Jasper/Breccia matrix

Turquoise (Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)) — mineral

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Petrified Wood (Silicified Wood (SiO2)) — mineral

Petrified Wood

Silicified Wood (SiO2)

Emerald in Matrix (Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities) — gemstone

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Opalite (Synthetic Opalised Glass) — Mineral (Synthetic / Man-made)

Opalite

Synthetic Opalised Glass

Mineral (Synthetic / Man-made)

Chert (specifically a nodule with Chalcendony/Agate banding) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (specifically a nodule with Chalcendony/Agate banding)

Microcrystalline Quartz (SiO2)

Sandy Ironstone (Ferruginous Sandstone) — sedimentary

Sandy Ironstone

Ferruginous Sandstone

Peacock Ore (Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with iridescent tarnish) — mineral

Peacock Ore

Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with iridescent tarnish

Fossilized Coral in Chert (Anthozoa (Class) fossil in Cryptocrystalline Quartz (SiO2)) — fossil

Fossilized Coral in Chert

Anthozoa (Class) fossil in Cryptocrystalline Quartz (SiO2)

Fossilized Shark Tooth (Eocene Lamniformes (Mackerel Shark clade)) — fossil

Fossilized Shark Tooth

Eocene Lamniformes (Mackerel Shark clade)

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

Banded Chert (Flint)

Silicon Dioxide (SiO2)

Fossilized Bone (Vertebrate Fossil Fragment (Calcium Phosphate / Hydroxyapatite)) — fossil

Fossilized Bone

Vertebrate Fossil Fragment (Calcium Phosphate / Hydroxyapatite)

Petrified Wood (Silicified Wood (SiO2 permineralization)) — fossil

Petrified Wood

Silicified Wood (SiO2 permineralization)

Chert (Red/Pink variety) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Red/Pink variety)

Microcrystalline quartz (SiO2)

Chert (and Jasper) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (and Jasper)

Microcrystalline Quartz (SiO2)

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

Banded Chert (Jasper)

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert Pebble (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Pebble

Microcrystalline Quartz (SiO2)

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

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert (Microcrystalline Silicon Dioxide (SiO2)) — sedimentary

Chert

Microcrystalline Silicon Dioxide (SiO2)

Chert (Jasper) (Microcrystalline Quartz (SiO2) with Iron Oxide inclusions) — sedimentary

Chert (Jasper)

Microcrystalline Quartz (SiO2) with Iron Oxide inclusions

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

Chert / Flint

Chert (Cryptocrystalline Quartz, SiO2)

Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

Chert / Flint (with quartz or calcite inclusion) (Silicon dioxide (SiO2)) — sedimentary

Chert / Flint (with quartz or calcite inclusion)

Silicon dioxide (SiO2)

Coprolite (Coprolite (fossilized feces)) — sedimentary

Coprolite

Coprolite (fossilized feces)

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

Chert (River Pebble)

Microcrystalline Quartz (SiO2)

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

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Nodular Chert) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Nodular Chert)

Silicon Dioxide (SiO2)

Pyrite in Limestone (Iron Sulfide (FeS2) in Calcium Carbonate (CaCO3)) — mineral

Pyrite in Limestone

Iron Sulfide (FeS2) in Calcium Carbonate (CaCO3)

Chert (Arrowhead variety) (Chert (SiO2)) — sedimentary

Chert (Arrowhead variety)

Chert (SiO2)

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

Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Chert (Flint) (Microcrystalline Silica (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Silica (SiO2)

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

Petrified Wood

Silicified wood (primarily SiO2)

Chert (with Limonite staining) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (with Limonite staining)

Microcrystalline Quartz (SiO2)

Dinosaur Fossil (Skull) (Dinosauria fossilis (Petrified Hydroxyapatite / Calcium Carbonate)) — sedimentary

Dinosaur Fossil (Skull)

Dinosauria fossilis (Petrified Hydroxyapatite / Calcium Carbonate)

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

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (specifically Brown Chert or Flint) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (specifically Brown Chert or Flint)

Cryptocrystalline Quartz (SiO2)

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

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)