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 (Ferruginous) (Arenite (SiO2 with Fe2O3 cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 cement)

Amazonite (K(AlSi3O8), Microcline (potassium feldspar)) — mineral

Amazonite

K(AlSi3O8), Microcline (potassium feldspar)

Quartz (Iron-Stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Chert Nodule in Limestone (Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)) — sedimentary

Chert Nodule in Limestone

Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)

Chert (often called Jasper or Flint in this color variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (often called Jasper or Flint in this color variety)

Silicon Dioxide (SiO2)

Milky quartz (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz

Quartz, silicon dioxide (SiO₂)

Wood Paneling (Engineered Wood / Plywood Paneling) — not a rock

Wood Paneling

Engineered Wood / Plywood Paneling

Iron Slag (Iron Slag (Industrial Vitreous Material)) — Mineral/By-product

Iron Slag

Iron Slag (Industrial Vitreous Material)

Mineral/By-product

Diamond (as set in a metal alloy ring) (Diamond (Pure Carbon, C)) — mineral

Diamond (as set in a metal alloy ring)

Diamond (Pure Carbon, C)

Quartz pebble (Silicon dioxide (SiO2)) — mineral

Quartz pebble

Silicon dioxide (SiO2)

Sandstone (Sedimentary Clastic Rock) — sedimentary

Sandstone

Sedimentary Clastic Rock

Jasper with Quartz Veining (Microcrystalline quartz (SiO2) with iron oxide impurities) — sedimentary

Jasper with Quartz Veining

Microcrystalline quartz (SiO2) with iron oxide impurities

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

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

Sandstone

Clastic sedimentary rock (Quartz arenite or Arkose)

Sandstone (Sedimentary Rock (Quartz/Feldspar grains cemented together)) — sedimentary

Sandstone

Sedimentary Rock (Quartz/Feldspar grains cemented together)

Fossilized Coral (Hexagonaria (Rugose coral) / Calcium Carbonate (CaCO3)) — fossil

Fossilized Coral

Hexagonaria (Rugose coral) / Calcium Carbonate (CaCO3)

Sandstone (Sedimentary Rock (Quartz Arenite)) — sedimentary

Sandstone

Sedimentary Rock (Quartz Arenite)

Graphic Granite / Pegmatite (Graphic Granite (Alkali Feldspar and Quartz)) — igneous

Graphic Granite / Pegmatite

Graphic Granite (Alkali Feldspar and Quartz)

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

Milky Quartz with Iron Staining

Quartz (SiO2)

Sandstone (Clastic sedimentary rock) — sedimentary

Sandstone

Clastic sedimentary rock

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock

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

Sandstone Pebble

Sedimentary Clastic Rock (Quartz Arenite)

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

Sandstone

Sedimentary Rock (Quartz arenite or arkose)

Sandstone (Quartz Arenite / Sedimentary Rock) — sedimentary

Sandstone

Quartz Arenite / Sedimentary Rock

Sandstone Pebble (Sedimentary Rock (Quartzose Sandstone)) — sedimentary

Sandstone Pebble

Sedimentary Rock (Quartzose Sandstone)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Sedimentary Rock (Quartz arenite)) — sedimentary

Sandstone

Sedimentary Rock (Quartz arenite)

Sandstone with Lichen and Iron Oxide Staining (Quartz Arenite / Sandstone) — sedimentary

Sandstone with Lichen and Iron Oxide Staining

Quartz Arenite / Sandstone

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (with potential fossil fragments) (Sandstone (SiO2 dominated with iron oxides)) — sedimentary

Sandstone (with potential fossil fragments)

Sandstone (SiO2 dominated with iron oxides)

Granite Boulder (Glacial Erratic) (Granite) — igneous

Granite Boulder (Glacial Erratic)

Granite

Granite Cobble (Granite) — igneous

Granite Cobble

Granite

Sandstone (Arenite (Sandstone)) — sedimentary

Sandstone

Arenite (Sandstone)

Sandstone (Sedimentary rock composed mainly of quartz sand) — sedimentary

Sandstone

Sedimentary rock composed mainly of quartz sand

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock

Golden Quartz (Silicon Dioxide (SiO2)) — mineral

Golden Quartz

Silicon Dioxide (SiO2)

Red Sandstone (Sandstone (principally Quartz, SiO2, with Iron Oxide hematite cement)) — sedimentary

Red Sandstone

Sandstone (principally Quartz, SiO2, with Iron Oxide hematite cement)

Sandstone (Sandstone (Quartz-rich sedimentary rock)) — sedimentary

Sandstone

Sandstone (Quartz-rich sedimentary rock)

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

Red Jasper

SiO2 (Silicon Dioxide with Iron Oxide inclusions)

Pebble Gravel Mix (Quartzite, Basalt, Chert) (Alluvial River Gravel / Aggregate Clasts) — sedimentary

Pebble Gravel Mix (Quartzite, Basalt, Chert)

Alluvial River Gravel / Aggregate Clasts

Agate Nodules (Cryptocrystalline Quartz (SiO2)) — mineral

Agate Nodules

Cryptocrystalline Quartz (SiO2)