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 (Sedimentary Rock (Quartz arenite/Arkose)) — sedimentary

Sandstone

Sedimentary Rock (Quartz arenite/Arkose)

Jasper (Silicon Dioxide (Microcrystalline Quartz, SiO2)) — sedimentary

Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Quartz pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz pebble

Silicon dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Crinoid Stem Fossil (Crinoida (columnal ossicles)) — fossil

Crinoid Stem Fossil

Crinoida (columnal ossicles)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Sandstone (Sedimentary Clastic Rock) — sedimentary

Sandstone

Sedimentary Clastic Rock

Quartz pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz pebble

Silicon dioxide (SiO2)

Quartz Pebble with Chlorite or Epidote Inclusions (Silicon Dioxide (SiO2) with inclusions) — metamorphic

Quartz Pebble with Chlorite or Epidote Inclusions

Silicon Dioxide (SiO2) with inclusions

Mica Schist (Schist) — metamorphic

Mica Schist

Schist

Sandstone (Calcareous) (Clastic sedimentary rock (primarily SiO2 with CaCO3 cement)) — sedimentary

Sandstone (Calcareous)

Clastic sedimentary rock (primarily SiO2 with CaCO3 cement)

Unakite (Unakite (metamorphosed granitic rock)) — metamorphic

Unakite

Unakite (metamorphosed granitic rock)

Fossiliferous Sandstone with Plant Remains (Arenite with Carbonaceous impressions (likely Paleozoic/Mesozoic Flora)) — sedimentary

Fossiliferous Sandstone with Plant Remains

Arenite with Carbonaceous impressions (likely Paleozoic/Mesozoic Flora)

Coarse-grained Granite (Granitoid (Felsic Plutonic Rock)) — igneous

Coarse-grained Granite

Granitoid (Felsic Plutonic Rock)

Sandstone (Arenite (SiO2 with various cementing agents)) — sedimentary

Sandstone

Arenite (SiO2 with various cementing agents)

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

Pink Granite

Phaneritic Plutonic Igneous Rock (high K-feldspar)

Porphyritic Rhyolite (Birdseye Rhyolite) (Rhyolite (Porphyritic texture)) — igneous

Porphyritic Rhyolite (Birdseye Rhyolite)

Rhyolite (Porphyritic texture)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Slag (Industrial) (N/A (Anthropogenic Slag)) — industrial by-product

Slag (Industrial)

N/A (Anthropogenic Slag)

industrial by-product

Granite (Granite) — Igneous

Granite

Granite

Quartzite Geode or Crystalline Quartz Node (Silicon Dioxide (SiO2)) — metamorphic

Quartzite Geode or Crystalline Quartz Node

Silicon Dioxide (SiO2)

Sandstone (Pebble) (Arenite (SiO2 based)) — sedimentary

Sandstone (Pebble)

Arenite (SiO2 based)

Likely quartz-rich metamorphic rock (quartzite or milky quartz) (Quartzite; predominantly quartz (SiO₂), possibly with feldspar and iron-oxide staining) — metamorphic

Likely quartz-rich metamorphic rock (quartzite or milky quartz)

Quartzite; predominantly quartz (SiO₂), possibly with feldspar and iron-oxide staining

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Diamond (Emerald Cut) (Carbon (C)) — mineral

Diamond (Emerald Cut)

Carbon (C)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Asphalt (Bituminous Concrete) (Asphaltum / Bitumen-Aggregate Matrix) — Technonatural composite (often containing sedimentary/igneous aggregate)

Asphalt (Bituminous Concrete)

Asphaltum / Bitumen-Aggregate Matrix

Technonatural composite (often containing sedimentary/igneous aggregate)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Diamond (in Jewelry) (Diamond (Carbon, C)) — mineral

Diamond (in Jewelry)

Diamond (Carbon, C)

Quartz vein in Schist (Crystalline Silicon Dioxide (SiO2) in Metamorphic Host) — metamorphic

Quartz vein in Schist

Crystalline Silicon Dioxide (SiO2) in Metamorphic Host

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartzite in Conglomerate (Clastic Sedimentary Rock with Silicon Dioxide (SiO2) inclusions) — sedimentary

Quartzite in Conglomerate

Clastic Sedimentary Rock with Silicon Dioxide (SiO2) inclusions

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon dioxide (SiO2)

Quartz Pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz pebble (Silicon dioxide (SiO2)) — mineral

Quartz pebble

Silicon dioxide (SiO2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock

Sandstone (Sedimentary Clastic Rock (Quartz-rich)) — sedimentary

Sandstone

Sedimentary Clastic Rock (Quartz-rich)