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 (Arenite/Quartz Arenite) — sedimentary

Sandstone

Arenite/Quartz Arenite

Amethyst Quartz (Silicon Dioxide (SiO2)) — mineral

Amethyst Quartz

Silicon Dioxide (SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Serpentinite (Serpentinite (composed primarily of minerals in the serpentine group: (Mg,Fe)3Si2O5(OH)4)) — metamorphic

Serpentinite

Serpentinite (composed primarily of minerals in the serpentine group: (Mg,Fe)3Si2O5(OH)4)

Schist (Mica Schist (Metamorphic Rock)) — metamorphic

Schist

Mica Schist (Metamorphic Rock)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

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

White Quartz

Quartz (Silicon Dioxide, SiO2)

Granite (Intrusive igneous rock) — igneous

Granite

Intrusive igneous rock

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

White Quartz (Silicon Dioxide (SiO2)) — mineral

White Quartz

Silicon Dioxide (SiO2)

Porphyry (Basaltic / Andesitic Porphyry) (Porphyritic Basalt / Porphyritic Andesite) — igneous

Porphyry (Basaltic / Andesitic Porphyry)

Porphyritic Basalt / Porphyritic Andesite

Biotite (Mica) (K(Mg,Fe)3AlSi3O10(OH,F)2) — mineral

Biotite (Mica)

K(Mg,Fe)3AlSi3O10(OH,F)2

Bauxite (Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))) — sedimentary

Bauxite

Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))

Quartz (Milky/Yellowish variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Yellowish variety)

Silicon Dioxide (SiO2)

Tumbled prehnite (probable) (Prehnite, Ca₂Al₂Si₃O₁₀(OH)₂; possibly epidote- or chlorite-bearing) — mineral

Tumbled prehnite (probable)

Prehnite, Ca₂Al₂Si₃O₁₀(OH)₂; possibly epidote- or chlorite-bearing

Polished orbicular jasper (likely kambaba jasper) (Silicified microcrystalline quartz/chalcedony, commonly with chlorite- or amphibole-rich orbicules; composition varies) — metamorphic

Polished orbicular jasper (likely kambaba jasper)

Silicified microcrystalline quartz/chalcedony, commonly with chlorite- or amphibole-rich orbicules; composition varies

Iron-rich meteorite candidate (Undetermined Fe–Ni meteorite, possibly an ordinary chondrite or iron meteorite) — meteorite

Iron-rich meteorite candidate

Undetermined Fe–Ni meteorite, possibly an ordinary chondrite or iron meteorite

Iron-stained quartz-rich rock, likely quartzite or silicified breccia (Quartz (SiO₂), possibly quartzite with limonite/goethite iron oxides) — metamorphic

Iron-stained quartz-rich rock, likely quartzite or silicified breccia

Quartz (SiO₂), possibly quartzite with limonite/goethite iron oxides

Greenish translucent mineral fragment (Indeterminate; possibly serpentine, epidote, or green glassy feldspar) — mineral

Greenish translucent mineral fragment

Indeterminate; possibly serpentine, epidote, or green glassy feldspar

Likely polished bronzite or serpentine-rich rock (Probable bronzite, an iron-bearing orthopyroxene (Mg,Fe)SiO₃; exact identification requires testing) — mineral

Likely polished bronzite or serpentine-rich rock

Probable bronzite, an iron-bearing orthopyroxene (Mg,Fe)SiO₃; exact identification requires testing

Jasper (Microcrystalline Quartz (Chalcedony), SiO2) — sedimentary

Jasper

Microcrystalline Quartz (Chalcedony), SiO2

Dinosaur Fossil Tooth (Vertebrate Fossilized Tooth) — fossil

Dinosaur Fossil Tooth

Vertebrate Fossilized Tooth

Fossil Shark Tooth (Chondrichthyes (class)) — fossil

Fossil Shark Tooth

Chondrichthyes (class)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Fossil Shark Tooth (Selachii (fossilized dentition)) — fossil

Fossil Shark Tooth

Selachii (fossilized dentition)

Fulgurite (Fulgurite (Lechatelierite or fused sand/quartz)) — mineral

Fulgurite

Fulgurite (Lechatelierite or fused sand/quartz)

Red Jasper with Quartz (Microcrystalline Quartz (SiO2)) — sedimentary

Red Jasper with Quartz

Microcrystalline Quartz (SiO2)

Coal (Anthracite / Bituminous Coal) — sedimentary

Coal

Anthracite / Bituminous Coal

Bivalve Fossil (Fossilized Shell) (Class Bivalvia (fossilized in Calcium Carbonate/Aragonite)) — fossil

Bivalve Fossil (Fossilized Shell)

Class Bivalvia (fossilized in Calcium Carbonate/Aragonite)

Fossil Coral (Scleractinia or Anthozoa (Fossilized)) — fossil

Fossil Coral

Scleractinia or Anthozoa (Fossilized)

Blue Goldstone (Synthetic glass with cobalt and copper inclusions) — man-made glass

Blue Goldstone

Synthetic glass with cobalt and copper inclusions

Ironstone Concretion (Ironstone (primarily Siderite or Limonite)) — sedimentary

Ironstone Concretion

Ironstone (primarily Siderite or Limonite)

Bivalve Fossil (Internal Mold) (Bivalvia (Phalladomya or similar genus)) — fossil

Bivalve Fossil (Internal Mold)

Bivalvia (Phalladomya or similar genus)

Petrified Wood (Silicified Wood (primarily SiO2)) — fossil

Petrified Wood

Silicified Wood (primarily SiO2)

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

Chert (Flint)

Microcrystalline Quartz (SiO2)