Rock Identifier

Category

Organic Materia (Not A Rock Or Mineral)

Browse organic materia (not a rock or mineral) specimens identified by the Rock Identifier community.

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

Chert (Flint variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

sedimentary
Sandstone (Arenite (SiO2 principal)) — sedimentary

Sandstone

Arenite (SiO2 principal)

sedimentary
Sandstone (with potential mineral staining/concretions) (Arenite (SiO2 based)) — sedimentary

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary
Agate (specifically a Yellow/Honey Agate) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — mineral

Agate (specifically a Yellow/Honey Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

mineral
Septarian Nodule (Septarian Concretion) — sedimentary

Septarian Nodule

Septarian Concretion

sedimentary
Petrified Wood (Silicified Wood (SiO2 - Silicon Dioxide)) — sedimentary

Petrified Wood

Silicified Wood (SiO2 - Silicon Dioxide)

sedimentary
Druzy Quartz on Host Rock (Silicon Dioxide (SiO2)) — mineral

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2)

mineral
Petrified Wood (Silicified Wood (primarily SiO₂ - Silicon Dioxide)) — metamorphic

Petrified Wood

Silicified Wood (primarily SiO₂ - Silicon Dioxide)

metamorphic
Jasper (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Jasper

Jasper (Silicon Dioxide, SiO2)

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

Chert (Flint Nodules)

Microcrystalline Quartz (SiO2)

sedimentary
Gneiss (High-grade regional metamorphic rock (Foliated)) — metamorphic

Gneiss

High-grade regional metamorphic rock (Foliated)

metamorphic
Chert Nodule (Fossiliferous Chert) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Nodule (Fossiliferous Chert)

Microcrystalline Quartz (SiO2)

sedimentary
Veined Limestone (Micrite) with Quartz/Calcite Veins (Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions) — sedimentary

Veined Limestone (Micrite) with Quartz/Calcite Veins

Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions

sedimentary
Moss Agate (Chalcedony (SiO2) with inclusions of manganese or iron oxides) — mineral

Moss Agate

Chalcedony (SiO2) with inclusions of manganese or iron oxides

mineral
Unakite (Epidotized Granite) — metamorphic

Unakite

Epidotized Granite

metamorphic
Sandstone (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone

Clastic sedimentary rock (primarily SiO2)

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

Chert (Flint variety)

Chert (SiO2)

sedimentary
Chert (varieties include Flint and Jasper) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

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

Peacock Ore

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

mineral
Petrified Wood (Calamites Fossil) (Calamites sp. (Silicified/Permineralized Plant Fossil)) — sedimentary

Petrified Wood (Calamites Fossil)

Calamites sp. (Silicified/Permineralized Plant Fossil)

sedimentary
Slate with Quartz Vein (Foliated Metamorphic Rock (Mainly Quartz, Muscovite, Chlorite)) — metamorphic

Slate with Quartz Vein

Foliated Metamorphic Rock (Mainly Quartz, Muscovite, Chlorite)

metamorphic
Sandstone (Ferruginous) (Arenite (SiO2 with iron oxide impurities)) — sedimentary

Sandstone (Ferruginous)

Arenite (SiO2 with iron oxide impurities)

sedimentary
Quartz-veined Mudstone or Argillite (SiO2 (Quartz) in Siltstone/Mudstone matrix) — sedimentary

Quartz-veined Mudstone or Argillite

SiO2 (Quartz) in Siltstone/Mudstone matrix

sedimentary
Asphalt / Bituminous Aggregate (Bituminous mixture (Hydrocarbon-based sediment)) — sedimentary

Asphalt / Bituminous Aggregate

Bituminous mixture (Hydrocarbon-based sediment)

sedimentary
Chert (Flint variety) (Microcrystalline context of Quartz (SiO2)) — sedimentary

Chert (Flint variety)

Microcrystalline context of Quartz (SiO2)

sedimentary
Picture Jasper (Silicon Dioxide (SiO2) with iron oxide and organic impurities) — sedimentary

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and organic impurities

sedimentary
Gneiss (Foliated Metamorphic Rock (Gneiss)) — metamorphic

Gneiss

Foliated Metamorphic Rock (Gneiss)

metamorphic
Petrified Wood (Agatized/Silicified Wood) (Silicified Wood / Chalcedony (SiO2)) — sedimentary

Petrified Wood (Agatized/Silicified Wood)

Silicified Wood / Chalcedony (SiO2)

sedimentary
Ironstone Concretion (Limonite/Goethite) (Iron oxide concretion (contains FeO(OH)·nH2O)) — sedimentary

Ironstone Concretion (Limonite/Goethite)

Iron oxide concretion (contains FeO(OH)·nH2O)

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

Chert (Flint)

Silicon Dioxide (SiO2)

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

Chert (Jasper)

Microcrystalline Silica (SiO2)

sedimentary
Granite (Plutonic felsic rock (Quartz, Feldspar, Mica)) — igneous

Granite

Plutonic felsic rock (Quartz, Feldspar, Mica)

igneous
Petrified Wood (Silicified wood (SiO2 - Silicon Dioxide)) — sedimentary

Petrified Wood

Silicified wood (SiO2 - Silicon Dioxide)

sedimentary
Petrified Wood (Silicified Wood) (Silicified Paleoflora (mainly Quartz, SiO2)) — metamorphic

Petrified Wood (Silicified Wood)

Silicified Paleoflora (mainly Quartz, SiO2)

metamorphic
Petrified Wood (Silicified wood (Quartz variant, SiO2)) — sedimentary

Petrified Wood

Silicified wood (Quartz variant, SiO2)

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

Petrified Wood

Silicified Wood (SiO2)

sedimentary
Granite with Epidote (Granite, containing quartz, feldspar, and epidote) — Igneous

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Igneous
Chert Pebble (Jasper/Quartz variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Pebble (Jasper/Quartz variety)

Microcrystalline Quartz (SiO2)

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

Petrified Wood

Silicified Wood (primarily SiO2)

metamorphic
Shale (Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)) — sedimentary

Shale

Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)

sedimentary
Amber (Succinite (specifically for Baltic amber); Approximate formula: C10H16O) — Organic Gemstone (Mineraloid)

Amber

Succinite (specifically for Baltic amber); Approximate formula: C10H16O

Organic Gemstone (Mineraloid)
Moonstone (Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8) — mineral

Moonstone

Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8

mineral