Rock Identifier

Category

Organic Gemstone (Not A Mineral)

Browse organic gemstone (not a mineral) specimens identified by the Rock Identifier community.

Learn about Organic Gemstone (Not A Mineral) in the encyclopedia

Black Shale

Jet

Malachite

Sapropel

Bituminous Shale

Bituminous Shale

Red Garnet

Shungite

Anatase

Sperrylite

Petrified Wood

Amber

Hutcheonite

Chert (Chalcedony/Jasper) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Chalcedony/Jasper)

Microcrystalline Quartz (SiO2)

Petrified Wood (Silicified Wood (SiO2)) — mineral

Petrified Wood

Silicified Wood (SiO2)

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

Jasper (specifically Yellow Jasper and Red Jasper)

Silicon Dioxide (SiO2) with iron oxide inclusions

Tree Agate (Dendritic Agate (Silicon Dioxide, SiO2 with chlorite inclusions)) — mineral

Tree Agate

Dendritic Agate (Silicon Dioxide, SiO2 with chlorite inclusions)

Moss Agate (Silicon Dioxide (SiO2) with Chlorite/Oxide inclusions) — mineral

Moss Agate

Silicon Dioxide (SiO2) with Chlorite/Oxide inclusions

Quartz Vein Rock (Silicon dioxide (SiO2) within a host rock matrix) — mineral

Quartz Vein Rock

Silicon dioxide (SiO2) within a host rock matrix

Chert (with Limestone matrix) (Chert (Silica: SiO2)) — sedimentary

Chert (with Limestone matrix)

Chert (Silica: SiO2)

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

Mookaite Jasper

Silicified Radiolarite (SiO2 with iron impurities)

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

Chert (Flint variety)

Chert (Cryptocrystalline Quartz, SiO2)

Fossilized Shell Fragment / Mother of Pearl (Calcium Carbonate (CaCO3) - Aragonite/Calcite biomineral) — fossil

Fossilized Shell Fragment / Mother of Pearl

Calcium Carbonate (CaCO3) - Aragonite/Calcite biomineral

Chert (often called Flint or Jasper) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (often called Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chalcedony / Agate with Botryoidal Quartz (Silicon Dioxide (SiO2)) — sedimentary

Chalcedony / Agate with Botryoidal Quartz

Silicon Dioxide (SiO2)

Amber (Succinite (Fossilized Tree Resin, C10H16O)) — mineral

Amber

Succinite (Fossilized Tree Resin, C10H16O)

Moss Agate (Chalcedony (Silicon Dioxide / SiO2)) — mineral

Moss Agate

Chalcedony (Silicon Dioxide / SiO2)

Moss Agate (Silicon Dioxide with inclusions (SiO2)) — mineral

Moss Agate

Silicon Dioxide with inclusions (SiO2)

Green Moss Agate / Jasper (Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron and Manganese inclusions) — sedimentary

Green Moss Agate / Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron and Manganese inclusions

Amber (Succinite (with a generalized formula of C10H16O)) — mineral

Amber

Succinite (with a generalized formula of C10H16O)

Emerald (Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)) — mineral

Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

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

Chert (Iron-stained)

Chert (SiO2)

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

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Small greenish crystal/mineral fragment (Indeterminate; possibly olivine, quartz, or a green gemstone fragment) — mineral

Small greenish crystal/mineral fragment

Indeterminate; possibly olivine, quartz, or a green gemstone fragment

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Limestone Concretion (Botryoidal/Calcareous Nodules) (Calcium Carbonate Concretion (CaCO3)) — sedimentary

Limestone Concretion (Botryoidal/Calcareous Nodules)

Calcium Carbonate Concretion (CaCO3)

Chert (Jasper) (Silicon dioxide (SiO2)) — sedimentary

Chert (Jasper)

Silicon dioxide (SiO2)

Fossil Shark Tooth (Lamniformes (order) - likely Cretalamna or Carcharias species) — fossil

Fossil Shark Tooth

Lamniformes (order) - likely Cretalamna or Carcharias species

Chert (and/or Chalcedony) (Microcrystalline Silica (SiO2)) — sedimentary

Chert (and/or Chalcedony)

Microcrystalline Silica (SiO2)

Chert (variations include Flint/Novaculite) (Chert (formula: SiO2)) — sedimentary

Chert (variations include Flint/Novaculite)

Chert (formula: SiO2)

Fossil Shark Tooth (Chondrichthyes (class)) — fossil

Fossil Shark Tooth

Chondrichthyes (class)

Moss Agate (Chalcedony (SiO2) with dendritic inclusions of Manganese or Iron oxide) — mineral

Moss Agate

Chalcedony (SiO2) with dendritic inclusions of Manganese or Iron oxide

Chert (Flint) (Chert (Microcrystalline Quartz, SiO2)) — sedimentary

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Yellow Jasper (Iron-stained Chert) (Silicon Dioxide (SiO2) with iron oxide (Limonite/Goethite) inclusions) — sedimentary

Yellow Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2) with iron oxide (Limonite/Goethite) inclusions

Chert (varietal: Flint/Jasper) (Silicon Dioxide (SiO2)) — sedimentary

Chert (varietal: Flint/Jasper)

Silicon Dioxide (SiO2)

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

Banded Chert / Chalcedony

Silicon Dioxide (SiO2)

Green Moss Agate (Agate (Silicon Dioxide, SiO2) with inclusions) — mineral

Green Moss Agate

Agate (Silicon Dioxide, SiO2) with inclusions

Amber ((C10H16O)n – an amorphous organic substance, primarily composed of polymerized isoprenoids.) — Mineral

Amber

(C10H16O)n – an amorphous organic substance, primarily composed of polymerized isoprenoids.

Petrified Wood (Silicified wood (SiO2)) — fossil

Petrified Wood

Silicified wood (SiO2)

Chert (Flint) (Chert (SiO2)) — sedimentary

Chert (Flint)

Chert (SiO2)

Petrified Wood (Silicified Wood (Permineralized wood)) — fossil

Petrified Wood

Silicified Wood (Permineralized wood)

Chert (Yellow Jasper/Flint) (Silicon dioxide (SiO2) - Cryptocrystalline Quartz) — sedimentary

Chert (Yellow Jasper/Flint)

Silicon dioxide (SiO2) - Cryptocrystalline Quartz

Graphite (Carbon (C)) — mineral

Graphite

Carbon (C)

Graphite (Graphite (Carbon, C)) — mineral

Graphite

Graphite (Carbon, C)

Mammoth Molar Fossil (Mammuthus primigenius (Tooth fragment)) — fossil

Mammoth Molar Fossil

Mammuthus primigenius (Tooth fragment)