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

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

Jasper / Chert Pebble

Microcrystalline Quartz (SiO2)

Sandstone (Sandstone (composed mainly of SiO2)) — sedimentary

Sandstone

Sandstone (composed mainly of SiO2)

Granite Boulder (and Tree Root) (Granite) — igneous

Granite Boulder (and Tree Root)

Granite

Banded Iron Formation (BIF) / Ferruginous Quartzite (Banded Iron Formation containing Hematite/Goethite and Chert/Quartz) — sedimentary

Banded Iron Formation (BIF) / Ferruginous Quartzite

Banded Iron Formation containing Hematite/Goethite and Chert/Quartz

Chert (Common Opal/Chalcedony nodule) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Common Opal/Chalcedony nodule)

Microcrystalline Quartz (SiO2)

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

Quartzite River Rock

Metamorphic Quartzite (SiO2)

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

Sandstone (Quartzose Sandstone)

Arenite (SiO2 based)

Red Sandstone (Arenite (SiO2 with Fe2O3)) — sedimentary

Red Sandstone

Arenite (SiO2 with Fe2O3)

Shale (Sedimentary rock composed of clay minerals and quartz) — sedimentary

Shale

Sedimentary rock composed of clay minerals and quartz

Red Sandstone (Ferruginous Sandstone (SiO2 with Fe2O3)) — sedimentary

Red Sandstone

Ferruginous Sandstone (SiO2 with Fe2O3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

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

Serpentine

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

Sandstone Pebble (River Cobble) (Arenite (Sandstone)) — sedimentary

Sandstone Pebble (River Cobble)

Arenite (Sandstone)

Green Aventurine (Silicon Dioxide (SiO2) with Fuchsite inclusions) — mineral

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Pink Granite / Gneiss Pebble (Quartz-Feldspar Granitic Rock) — igneous

Pink Granite / Gneiss Pebble

Quartz-Feldspar Granitic Rock

Quartz (Pegmatitic Quartz with Feldspar) (SiO2 (Silicon Dioxide)) — mineral

Quartz (Pegmatitic Quartz with Feldspar)

SiO2 (Silicon Dioxide)

Aventurine (Quartz (SiO2) with Fuchsite inclusions) — mineral

Aventurine

Quartz (SiO2) with Fuchsite inclusions

Breccia (Breccia (Sedimentary Clastic Rock)) — sedimentary

Breccia

Breccia (Sedimentary Clastic Rock)

Orange Calcite (or Yellow Calcite) (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite (or Yellow Calcite)

Calcium Carbonate (CaCO3)

Garnet (Rough Almandine Crystal) (Almandine Garnet (Fe3Al2(SiO4)3)) — mineral

Garnet (Rough Almandine Crystal)

Almandine Garnet (Fe3Al2(SiO4)3)

Carnelian (Polished Agate/Jasper) (SiO2 (Silicon Dioxide - Microcrystalline Quartz)) — mineral

Carnelian (Polished Agate/Jasper)

SiO2 (Silicon Dioxide - Microcrystalline Quartz)

Quartzite with Chlorite / Epidote Inclusion (Metamorphic Quartzite (SiO2 with chlorite/epidote inclusions)) — metamorphic

Quartzite with Chlorite / Epidote Inclusion

Metamorphic Quartzite (SiO2 with chlorite/epidote inclusions)

Sandstone (Arenite (SiO2 dominant)) — sedimentary

Sandstone

Arenite (SiO2 dominant)

Green Quartzite (Silicon Dioxide (SiO2) with mineral inclusions) — metamorphic

Green Quartzite

Silicon Dioxide (SiO2) with mineral inclusions

Greenstone (Greenschist facies metabasite) — metamorphic

Greenstone

Greenschist facies metabasite

Chalcedony (Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)) — mineral

Chalcedony

Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite (River Pebble) (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (SiO2)

Sandstone with Quartz Vein (Arenite with hydrothermal quartz intrusion) — sedimentary

Sandstone with Quartz Vein

Arenite with hydrothermal quartz intrusion

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

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

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Sandstone with Iron Staining (Arenite (SiO2 with FeO(OH) impurities)) — sedimentary

Sandstone with Iron Staining

Arenite (SiO2 with FeO(OH) impurities)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Bloodstone (Heliotrope) (Cryptocrystalline Quartz (SiO2) with inclusions of Iron Oxide/Hematite) — mineral

Bloodstone (Heliotrope)

Cryptocrystalline Quartz (SiO2) with inclusions of Iron Oxide/Hematite

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Red Sandstone Pebble (Arenite with iron oxide (Hematite)) — sedimentary

Red Sandstone Pebble

Arenite with iron oxide (Hematite)

Basalt (Mafic Igneous Rock) — igneous

Basalt

Mafic Igneous Rock

River Stone (composed of Siltstone/Basalt mixture) (Siltstone or microcrystalline Basalt pebble) — sedimentary

River Stone (composed of Siltstone/Basalt mixture)

Siltstone or microcrystalline Basalt pebble

Red Sandstone (Arenite (Ferruginous Sandstone)) — sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Sandstone with Mineral Veining or Crust (Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)) — sedimentary

Sandstone with Mineral Veining or Crust

Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)

Scoria (Lava Rock) (Scoria (basaltic pyroclastic rock)) — igneous

Scoria (Lava Rock)

Scoria (basaltic pyroclastic rock)

Scoria (Lava Rock) (Scoria (vesicular mafic igneous rock)) — igneous

Scoria (Lava Rock)

Scoria (vesicular mafic igneous rock)