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

Granodiorite / Granite (Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)) — igneous

Granodiorite / Granite

Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)

Vesicular Basalt (Mafic Igneous Rock (primarily Plagioclase and Pyroxene)) — igneous

Vesicular Basalt

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Flint or chert (Microcrystalline quartz (SiO₂), commonly with chalcedony) — sedimentary

Flint or chert

Microcrystalline quartz (SiO₂), commonly with chalcedony

Sandstone (Sandstone (clastic sedimentary rock)) — sedimentary

Sandstone

Sandstone (clastic sedimentary rock)

Arid Sandy Loam (Arenosols / Regosols) — sedimentary

Arid Sandy Loam

Arenosols / Regosols

Tumbled jasper, likely red/brown jasper (Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides) — metamorphic

Tumbled jasper, likely red/brown jasper

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides

Yellow Chert (Silicon Dioxide (SiO2)) — sedimentary

Yellow Chert

Silicon Dioxide (SiO2)

Tufa (Calcareous Tufa) (Calcareous Tufa (Precipitated CaCO3)) — sedimentary

Tufa (Calcareous Tufa)

Calcareous Tufa (Precipitated CaCO3)

Chert (Chert (SiO2)) — sedimentary

Chert

Chert (SiO2)

Diamond (Diamond (C)) — mineral

Diamond

Diamond (C)

Limestone (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Rough Emerald (Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities) — gemstone

Rough Emerald

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Tumbled milky quartz (Quartz (silicon dioxide, SiO₂)) — mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Garden Pebble (Quartzite or Limestone fragment) (Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) fragment) — sedimentary

Garden Pebble (Quartzite or Limestone fragment)

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) fragment

Coarse Sand or Fine Gravel (Detrital Sedimentary Fragments (mostly SiO2)) — sedimentary

Coarse Sand or Fine Gravel

Detrital Sedimentary Fragments (mostly SiO2)

Diamond (Carbon (C)) — mineral

Diamond

Carbon (C)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Fossilized Bivalve Shell (Class Bivalvia (fossilized)) — fossil

Fossilized Bivalve Shell

Class Bivalvia (fossilized)

Yellow Jasper (Quartz (Silicon Dioxide, SiO2 with impurities)) — sedimentary

Yellow Jasper

Quartz (Silicon Dioxide, SiO2 with impurities)

Seashell Fossil (Gastropoda fossil) — fossil

Seashell Fossil

Gastropoda fossil

Fossil Shark Tooth (Chondrichthyes (Class)) — fossil

Fossil Shark Tooth

Chondrichthyes (Class)

Fossilized Coral (Cnidaria (Hexacorallia)) — fossil

Fossilized Coral

Cnidaria (Hexacorallia)

Fossil Snail (Gastropoda fossil) — fossil

Fossil Snail

Gastropoda fossil

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

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

Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Blue Cat's Eye Quartz (Heated/Dyed) (Silicon Dioxide (SiO2) with fibrous inclusions) — mineral

Blue Cat's Eye Quartz (Heated/Dyed)

Silicon Dioxide (SiO2) with fibrous inclusions

Vuggy Limestone (Carbonate Sedimentary Rock with Vuggy Porosity (CaCO3)) — sedimentary

Vuggy Limestone

Carbonate Sedimentary Rock with Vuggy Porosity (CaCO3)

Opalite (Synthetic Opalized Glass) — gemstone

Opalite

Synthetic Opalized Glass

Flint (Chert (SiO2)) — sedimentary

Flint

Chert (SiO2)

Sandstone (Arenite (SiO2 predominantly)) — sedimentary

Sandstone

Arenite (SiO2 predominantly)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Chert (Flint) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Chert Arrowhead (Lithic Tool) (Microcrystalline quartz (SiO2) - Archeological lithic artifact) — sedimentary

Chert Arrowhead (Lithic Tool)

Microcrystalline quartz (SiO2) - Archeological lithic artifact

Chert (Flint Nodular) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Flint Nodular)

Silicon Dioxide (SiO2)

Shark Tooth Fossil (Carcharodonta (order Lamniformes), likely Carcharias spp.) — fossil

Shark Tooth Fossil

Carcharodonta (order Lamniformes), likely Carcharias spp.

Chert Nodule (with Geode cavity) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert Nodule (with Geode cavity)

Cryptocrystalline Quartz (SiO2)

Flint (Chert) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Flint (Chert)

Cryptocrystalline Quartz (SiO2)

Yellow Jasper (Silicon Dioxide (SiO2) with iron oxide impurities) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Pearl and Garnet Glass (Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass) — mineral and glass

Pearl and Garnet Glass

Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass

mineral and glass

Black Jasper (Silicon Dioxide (SiO2) with impurities) — sedimentary

Black Jasper

Silicon Dioxide (SiO2) with impurities