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

Polished ocean jasper (orbicular jasper), probable (Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral inclusions) — mineral

Polished ocean jasper (orbicular jasper), probable

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral inclusions

Quartz-rich metamorphic rock, likely quartzite (Quartzite; predominantly microcrystalline quartz (SiO₂), with possible mica or iron-oxide impurities) — metamorphic

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), with possible mica or iron-oxide impurities

Quartzite Pebble (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Metamorphic Quartzite (SiO2)

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

Sandstone

Sedimentary Rock (Quartz arenite/Arkose)

Quartzite Pebble (Metamorphic Quartz Sandstone (SiO2)) — metamorphic

Quartzite Pebble

Metamorphic Quartz Sandstone (SiO2)

Fossil Coral (Rugose Coral / Hexagonaria (CaCO3)) — fossil

Fossil Coral

Rugose Coral / Hexagonaria (CaCO3)

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

Jasper

Silicon Dioxide (Microcrystalline Quartz), SiO2

Sandstone (Sedimentary Clastic Rock (Quartz Arenite)) — sedimentary

Sandstone

Sedimentary Clastic Rock (Quartz Arenite)

Sandstone (Sedimentary Rock (Quartz Sandstone)) — sedimentary

Sandstone

Sedimentary Rock (Quartz Sandstone)

Sedimentary Rock (Limestone or Siltstone pebble) (Sedimentary rock fragment) — sedimentary

Sedimentary Rock (Limestone or Siltstone pebble)

Sedimentary rock fragment

Sandstone (Sedimentary Rock (Quartz arenite or arkose)) — sedimentary

Sandstone

Sedimentary Rock (Quartz arenite or arkose)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Red Sandstone (Quartz Arenite (iron-stained) / Quartzite precursor) — sedimentary

Red Sandstone

Quartz Arenite (iron-stained) / Quartzite precursor

Quartz Geode / Druzy Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz Geode / Druzy Quartz

Silicon Dioxide (SiO2)

Sandstone (Sandstone (SiO2 dominated)) — sedimentary

Sandstone

Sandstone (SiO2 dominated)

Unakite (or Polished Jasper Pebble) (Altered Granite (Epidote-Orthoclase Rock)) — metamorphic

Unakite (or Polished Jasper Pebble)

Altered Granite (Epidote-Orthoclase Rock)

Quartz (Milky/Smoky Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Smoky Quartz)

Silicon Dioxide (SiO2)

Red Jasper (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Granite (Granite (composed primarily of Quartz, Plagioclase, Alkali Feldspar, and Mica)) — igneous

Granite

Granite (composed primarily of Quartz, Plagioclase, Alkali Feldspar, and Mica)

Aventurine (Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2) — mineral

Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2

Granite (with Quartz fragment) (Intrusive Felsic Igneous Rock) — igneous

Granite (with Quartz fragment)

Intrusive Felsic Igneous Rock

Quartz with Iron Oxide Staining (Silicon Dioxide (SiO2)) — mineral

Quartz with Iron Oxide Staining

Silicon Dioxide (SiO2)

Diorite (River Cobble) (Intermediate phaneritic igneous rock) — igneous

Diorite (River Cobble)

Intermediate phaneritic igneous rock

Quartzite River Rock (Quartzite (primarily SiO2)) — metamorphic

Quartzite River Rock

Quartzite (primarily SiO2)

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Quartzite (Quartzite (mostly SiO2)) — metamorphic

Quartzite

Quartzite (mostly SiO2)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Sandstone (Sandstone (clastic sedimentary rock composite)) — sedimentary

Sandstone

Sandstone (clastic sedimentary rock composite)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Red Sandstone (Clastic sedimentary rock (Quartz arenite/Arkose)) — sedimentary

Red Sandstone

Clastic sedimentary rock (Quartz arenite/Arkose)

Rhodonite (Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3

Sodalite (Sodalite (Na8(Al6Si6O24)Cl2)) — mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Schist (Mica Schist) — metamorphic

Schist

Mica Schist

Quartzite Pebble (Metamorphic rock primarily composed of Quartz (SiO2)) — metamorphic

Quartzite Pebble

Metamorphic rock primarily composed of Quartz (SiO2)

Sandstone (Clastic sedimentary rock (Quartz arenite)) — sedimentary

Sandstone

Clastic sedimentary rock (Quartz arenite)

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock

Quartzite (Pink / Peach) (SiO2 (Metamorphosed Quartz Sandstone)) — metamorphic

Quartzite (Pink / Peach)

SiO2 (Metamorphosed Quartz Sandstone)

Fuchsite (Green Muscovite / Mica Schist) (Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)) — metamorphic

Fuchsite (Green Muscovite / Mica Schist)

Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock

Muscovite (Muscovite (KAl2(AlSi3O10)(OH)2)) — mineral

Muscovite

Muscovite (KAl2(AlSi3O10)(OH)2)

Conglomerate (Pebble Conglomerate) (Conglomerate) — sedimentary

Conglomerate (Pebble Conglomerate)

Conglomerate