Rock Identifier

Category

Biogenic Material

Browse biogenic material specimens identified by the Rock Identifier community.

Learn about Biogenic Material in the encyclopedia

Peat

Diatomite

Dunite

Limonite

Diamond

Peacock Opal

Metarhyolite

Rhodochrosite

Shell Opal

Madagascar Opal

Lavender Obsidian

Electric Blue Obsidian

Sandstone (Arenite (SiO2 principal component)) — sedimentary

Sandstone

Arenite (SiO2 principal component)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Sandstone (Arenite (predominantly SiO2)) — sedimentary

Sandstone

Arenite (predominantly SiO2)

Amber (Succinite (C10H16O)) — mineral

Amber

Succinite (C10H16O)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Geode or Concretion (Silica-filled nodule (likely SiO2)) — sedimentary

Geode or Concretion

Silica-filled nodule (likely SiO2)

Sandstone/Quartzite (Sedimentary Rock (composed mainly of SiO2)) — sedimentary

Sandstone/Quartzite

Sedimentary Rock (composed mainly of SiO2)

Conglomerate (Clastic Sedimentary Conglomerate (SiO2 based clasts in matrix)) — sedimentary

Conglomerate

Clastic Sedimentary Conglomerate (SiO2 based clasts in matrix)

Jasper with Epidote (Silicon Dioxide (SiO2) with Calcium Aluminum Iron Sorosilicate [Ca2Al2Fe3+Si3O12(OH)]) — sedimentary/metamorphic

Jasper with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Sorosilicate [Ca2Al2Fe3+Si3O12(OH)]

sedimentary/metamorphic

Chert (Chert (SiO2)) — sedimentary

Chert

Chert (SiO2)

Serpentinite (Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4) — metamorphic

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4

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

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Picture Sandstone) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Picture Sandstone)

Arenite (primarily SiO2)

Gneiss (Banded Gneiss) (Gneiss) — metamorphic

Gneiss (Banded Gneiss)

Gneiss

Granite (Granite) — Igneous

Granite

Granite

White Quartz (Milky Quartz) (Silicon Dioxide (SiO2)) — mineral

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Septarian Nodule (Septarian Concretion (Calcium Carbonate/Aragonite/Calcite/Siderite)) — sedimentary

Septarian Nodule

Septarian Concretion (Calcium Carbonate/Aragonite/Calcite/Siderite)

Copper-bearing Quartz (with Malachite and Iron Oxides) (Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)) — Mineral Specimen

Copper-bearing Quartz (with Malachite and Iron Oxides)

Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)

Mineral Specimen

Sandstone (Red) (Arenite (primarily Quartz, SiO2, with Iron Oxide cement)) — sedimentary

Sandstone (Red)

Arenite (primarily Quartz, SiO2, with Iron Oxide cement)

Quartzite (Quartzite (chiefly SiO2)) — metamorphic

Quartzite

Quartzite (chiefly SiO2)

Red Sandstone (Arenite with Iron Oxide (Hematite) cement) — sedimentary

Red Sandstone

Arenite with Iron Oxide (Hematite) cement

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Pink Granite (Phaneritic Igneous Rock (high K-feldspar content)) — igneous

Pink Granite

Phaneritic Igneous Rock (high K-feldspar content)

Biotite on Matrix (Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)) — mineral

Biotite on Matrix

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

Eudialyte (Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2) — mineral

Eudialyte

Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

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

Sandstone

Arenite (composed primarily of Quartz, SiO2)

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

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Greenschist (Greenschist (Actinolite-Chlorite Schist)) — metamorphic

Greenschist

Greenschist (Actinolite-Chlorite Schist)

Sandstone (Weathered Pebble) (Arenite (SiO2 primarily)) — sedimentary

Sandstone (Weathered Pebble)

Arenite (SiO2 primarily)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Limestone (River Pebble) (Calcite-rich Sedimentary Rock (CaCO3)) — sedimentary

Limestone (River Pebble)

Calcite-rich Sedimentary Rock (CaCO3)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Sandstone with Tafoni Weathering (Arenite (SiO2 based)) — sedimentary

Sandstone with Tafoni Weathering

Arenite (SiO2 based)

Coal (Anthracite or Bituminous) (Lithified plant matter (Carbon)) — sedimentary

Coal (Anthracite or Bituminous)

Lithified plant matter (Carbon)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Red Sandstone (Ferruginous Sandstone (formula varies, primarily SiO2 with Fe2O3)) — sedimentary

Red Sandstone

Ferruginous Sandstone (formula varies, primarily SiO2 with Fe2O3)

Sandstone (Arenite (specifically Quartz Arenite)) — sedimentary

Sandstone

Arenite (specifically Quartz Arenite)

Sandstone (Quartzose) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

Siltstone River Pebble (Siltstone (primarily composed of silt-sized particles)) — sedimentary

Siltstone River Pebble

Siltstone (primarily composed of silt-sized particles)

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Coal (Bituminous) (Organic sedimentary rock primarily consisting of carbon (C)) — sedimentary

Coal (Bituminous)

Organic sedimentary rock primarily consisting of carbon (C)