Rock Identifier

Category

Organic (Paper And Cellulose)

Browse organic (paper and cellulose) specimens identified by the Rock Identifier community.

Red Jasper (Quartz) (Silicon Dioxide (SiO2) with Iron impurities) — sedimentary

Red Jasper (Quartz)

Silicon Dioxide (SiO2) with Iron impurities

Anthracite Coal (Anthracite (Carbon-rich metamorphic coal)) — metamorphic

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Granite (Phaneritic Felsic Igneous Rock (Granite)) — igneous

Granite

Phaneritic Felsic Igneous Rock (Granite)

Tanzanite (Blue-violet Zoisite (Ca2Al3(SiO4)3(OH))) — mineral

Tanzanite

Blue-violet Zoisite (Ca2Al3(SiO4)3(OH))

Anthracite Coal (Anthracite (Carbon-rich metamorphic rock)) — metamorphic

Anthracite Coal

Anthracite (Carbon-rich metamorphic rock)

Sandstone (Arenite (SiO2 principal)) — sedimentary

Sandstone

Arenite (SiO2 principal)

Healer's Gold (Pyrite and Magnetite in Schist) (Magnetite (Fe3O4) and Pyrite (FeS2) in Mica Schist) — metamorphic

Healer's Gold (Pyrite and Magnetite in Schist)

Magnetite (Fe3O4) and Pyrite (FeS2) in Mica Schist

Sandstone (specifically Red Sandstone) (Arenite (primarily Quartz, SiO2)) — sedimentary

Sandstone (specifically Red Sandstone)

Arenite (primarily Quartz, SiO2)

Yellow Chalcedony (Agate/Jasper mix) (Silicon Dioxide (SiO2)) — mineral

Yellow Chalcedony (Agate/Jasper mix)

Silicon Dioxide (SiO2)

Schist (Mica Schist) — metamorphic

Schist

Mica Schist

Native Gold in Quartz (Native Gold (Au)) — mineral

Native Gold in Quartz

Native Gold (Au)

Pearl (Calcium Carbonate (Aragonite) - CaCO3) — mineral

Pearl

Calcium Carbonate (Aragonite) - CaCO3

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

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

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Bloodstone (Heliotrope) (Cryptocrystalline Quartz (SiO2) with inclusions of Hematite or Chlorite) — mineral

Bloodstone (Heliotrope)

Cryptocrystalline Quartz (SiO2) with inclusions of Hematite or Chlorite

Red Jasper (Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Scoria (Vesicular Basaltic Glass) — igneous

Scoria

Vesicular Basaltic Glass

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Sandstone (Stream-rounded) (Arenite (SiO2 based)) — sedimentary

Sandstone (Stream-rounded)

Arenite (SiO2 based)

Quartzite with Quartz Veins (Quartzite (chiefly SiO2)) — metamorphic

Quartzite with Quartz Veins

Quartzite (chiefly SiO2)

Sandstone (Arenite (composed primarily of Quartz, SiO2)) — sedimentary

Sandstone

Arenite (composed primarily of Quartz, SiO2)

Unable to Identify (Image Obscured) — Indeterminate

Unable to Identify (Image Obscured)

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

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Basalt (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Pyrite (Iron Disulfide (FeS2)) — mineral

Pyrite

Iron Disulfide (FeS2)

Quartzite (Quartzite (predominantly SiO2)) — metamorphic

Quartzite

Quartzite (predominantly SiO2)

Basalt (Basalt) — igneous

Basalt

Basalt

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

Chert (Flint variety)

Silicon Dioxide (SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Black Opal (Hydrated silica (SiO2·nH2O)) — mineraloid

Black Opal

Hydrated silica (SiO2·nH2O)

Basalt (Extrusive Mafic Igneous Rock) — igneous

Basalt

Extrusive Mafic Igneous Rock

Vesicular Basalt (Vesicular Basalt (Aphanitic Mafic Igneous Rock)) — igneous

Vesicular Basalt

Vesicular Basalt (Aphanitic Mafic Igneous Rock)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Sandstone (Clastic Sedimentary Rock (composed mostly of SiO2)) — sedimentary

Sandstone

Clastic Sedimentary Rock (composed mostly of SiO2)

Carnelian (Carnelian Agate (SiO2)) — mineral

Carnelian

Carnelian Agate (SiO2)

Anthracite Coal (Low-grade metamorphic carbonaceous rock) — metamorphic

Anthracite Coal

Low-grade metamorphic carbonaceous rock

Diamond (Carbon (C)) — mineral

Diamond

Carbon (C)

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

Red Jasper (possibly Orbicular)

Silicon Dioxide (SiO2) with iron oxide inclusions

Anthracite Coal (Anthracite) — sedimentary

Anthracite Coal

Anthracite

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Red Sandstone (Arenite (primarily Quartz with Iron Oxide)) — sedimentary

Red Sandstone

Arenite (primarily Quartz with Iron Oxide)

Granodiorite Core (Granodiorite) — igneous

Granodiorite Core

Granodiorite