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 (composed primarily of SiO2)) — sedimentary

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone

Arenite (composed primarily of SiO2)

Green Quartzite (Quartzite (SiO2 with chromium-rich impurities)) — metamorphic

Green Quartzite

Quartzite (SiO2 with chromium-rich impurities)

Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Iron Oxide)) — metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Iron Oxide)

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

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Sandstone with Liesegang Rings (Arenite with Iron Oxide Concretions) — sedimentary

Sandstone with Liesegang Rings

Arenite with Iron Oxide Concretions

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Engineered Quartz Stone (Agglomerated Quartz (SiO2 + Polymer Resin)) — mineral-based composite

Engineered Quartz Stone

Agglomerated Quartz (SiO2 + Polymer Resin)

mineral-based composite

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

Chert / Flint

Microcrystalline Quartz (SiO2)

Fossilized Shark Tooth (Chondrichthyes (Class) fossil) — fossil

Fossilized Shark Tooth

Chondrichthyes (Class) fossil

Honey-colored chalcedony (likely carnelian) (Microcrystalline quartz, SiO₂; orange chalcedony colored by iron oxides) — mineral

Honey-colored chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; orange chalcedony colored by iron oxides

Rose Quartz (Silicon dioxide (SiO2)) — mineral

Rose Quartz

Silicon dioxide (SiO2)

Dinosaur Claw Fossil (Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)) — fossil

Dinosaur Claw Fossil

Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)

Chert (Flint/Jasper) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Flint/Jasper)

Silicon Dioxide (SiO2)

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Tumbled turquoise-like stone (Likely turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O) — mineral

Tumbled turquoise-like stone

Likely turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O

Weathered sandstone fragment (Sandstone, primarily quartz (SiO₂) with feldspar and iron-oxide cement) — sedimentary

Weathered sandstone fragment

Sandstone, primarily quartz (SiO₂) with feldspar and iron-oxide cement

Polished brecciated jasper (likely ribbon jasper) (Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide inclusions) — mineral

Polished brecciated jasper (likely ribbon jasper)

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

Honey calcite (orange calcite) (Calcite — calcium carbonate, CaCO₃) — mineral

Honey calcite (orange calcite)

Calcite — calcium carbonate, CaCO₃

Dark flint or chert fragment (Microcrystalline quartz (SiO₂), likely flint/chert) — sedimentary

Dark flint or chert fragment

Microcrystalline quartz (SiO₂), likely flint/chert

Red synthetic corundum (ruby-colored lab-grown sapphire) (Corundum, aluminum oxide (Al₂O₃), likely synthetic and chromium-colored) — gemstone

Red synthetic corundum (ruby-colored lab-grown sapphire)

Corundum, aluminum oxide (Al₂O₃), likely synthetic and chromium-colored

Flagstone (Sedimentary Sandstone / Flagstone) — sedimentary

Flagstone

Sedimentary Sandstone / Flagstone

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)

Iron-stained Quartz Pebble (Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Goethite)) — mineral

Iron-stained Quartz Pebble

Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Goethite)

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

Green aventurine quartzite (likely) (Quartz-rich metamorphic rock; predominantly microcrystalline quartz (SiO₂), with possible fuchsite, chlorite, or epidote) — metamorphic

Green aventurine quartzite (likely)

Quartz-rich metamorphic rock; predominantly microcrystalline quartz (SiO₂), with possible fuchsite, chlorite, or epidote

Conglomerate (Clastic Sedimentary Rock (Conglomerate)) — sedimentary

Conglomerate

Clastic Sedimentary Rock (Conglomerate)

Basalt (Extrusive Igneous Basalt) — igneous

Basalt

Extrusive Igneous Basalt

Pink Granite (Phaneritic Felsic Igneous Rock (Granite)) — igneous

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Basalt (Aphanitic Mafic Volcanic Rock (Fe/Mg rich)) — igneous

Basalt

Aphanitic Mafic Volcanic Rock (Fe/Mg rich)

Basalt River Stone (Basalt) — igneous

Basalt River Stone

Basalt

Quartzite (SiO2 (Silicon Dioxide)) — metamorphic

Quartzite

SiO2 (Silicon Dioxide)

Basalt (Mafic Igneous Rock (Basalt)) — igneous

Basalt

Mafic Igneous Rock (Basalt)

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Greywacke (Lithic Sandstone (Greywacke)) — sedimentary

Greywacke

Lithic Sandstone (Greywacke)

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

White Quartz Pebble

Quartz (Silicon Dioxide, SiO2)