Rock Identifier

Category

Organic Material (Likely A Fruit Or Berry)

Browse organic material (likely a fruit or berry) specimens identified by the Rock Identifier community.

Learn about Organic Material (Likely A Fruit Or Berry) in the encyclopedia

Peat

Orange Obsidian

Sapropel

Bituminous Shale

Bituminous Shale

Black Shale

Amber

Lizard Skin Jasper

Petrified Wood

Jet

Oil Shale

Limonite

Tangerine Obsidian

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

Jasper

Jasper (Silicon Dioxide, SiO2)

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

Banded Chert

Banded Microcrystalline Quartz (SiO2)

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

Chert (Jasper/Common Chert Pebble)

Microcrystalline Quartz (SiO2)

Dark rounded pebble, likely basalt or volcanic rock (Fine-grained mafic igneous rock; possibly basalt (composition chiefly plagioclase and pyroxene)) — igneous

Dark rounded pebble, likely basalt or volcanic rock

Fine-grained mafic igneous rock; possibly basalt (composition chiefly plagioclase and pyroxene)

Mica-rich metamorphic rock, likely schist (Biotite–muscovite schist, possibly garnet-bearing) — metamorphic

Mica-rich metamorphic rock, likely schist

Biotite–muscovite schist, possibly garnet-bearing

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

Chert (Flint)

Silicon Dioxide (SiO2)

Shark Tooth Fossil (Carcharhiniformes or Lamniformes (order level fossil)) — fossil

Shark Tooth Fossil

Carcharhiniformes or Lamniformes (order level fossil)

Coral Fossil (Agatized Coral or Petoskey Stone) (Hexagonaria percarinata (if Petoskey) or generally Scleractinia (Agatized Coral)) — Sedimentary/Fossil

Coral Fossil (Agatized Coral or Petoskey Stone)

Hexagonaria percarinata (if Petoskey) or generally Scleractinia (Agatized Coral)

Sedimentary/Fossil

Chert (Chert (Silica: SiO2)) — sedimentary

Chert

Chert (Silica: SiO2)

Chert (and/or Flint) (Chert (Cryptocrystalline variety of Quartz, SiO2)) — sedimentary

Chert (and/or Flint)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Chert (Yellow Jasper/Honey Chert) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Yellow Jasper/Honey Chert)

Silicon Dioxide (SiO2)

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

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

Sandstone (Weathered) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Weathered)

Arenite (primarily SiO2)

Sandstone (clastic) (Clastic Sedimentary Rock (primarily composed of SiO2)) — sedimentary

Sandstone (clastic)

Clastic Sedimentary Rock (primarily composed of SiO2)

Metallic sulfide ore, likely pyrite-bearing rock (Pyrite (FeS₂), possibly with chalcopyrite and quartz/host rock) — mineral

Metallic sulfide ore, likely pyrite-bearing rock

Pyrite (FeS₂), possibly with chalcopyrite and quartz/host rock

Banded Quartzite or Gneissic Pebble (Quartzite with mafic inclusions (SiO2) or Banded Gneiss) — metamorphic

Banded Quartzite or Gneissic Pebble

Quartzite with mafic inclusions (SiO2) or Banded Gneiss

Petrified Wood (Silicified wood (Quartz, SiO2)) — fossil

Petrified Wood

Silicified wood (Quartz, SiO2)

Petrified Wood (Silicified Wood (Quartzo-feldspathic fossil wood)) — fossil

Petrified Wood

Silicified Wood (Quartzo-feldspathic fossil wood)

Banded Chert / Sandstone Pebble (Microcrystalline Quartz (SiO2) / Silicified Sandstone) — sedimentary

Banded Chert / Sandstone Pebble

Microcrystalline Quartz (SiO2) / Silicified Sandstone

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

Jasper

Silicon Dioxide (SiO2) with impurities

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

River Cobble (Quartzite or Sandstone) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

River Cobble (Quartzite or Sandstone)

Clastic sedimentary rock (primarily SiO2)

Sandstone (Arenite (SiO2 based with quartz grains)) — sedimentary

Sandstone

Arenite (SiO2 based with quartz grains)

Chert (Yellow Jasper) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Fossil Shark Tooth (Chondrichthyes (Class)) — fossil

Fossil Shark Tooth

Chondrichthyes (Class)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Weathered granite (likely biotite granite) (Granite; interlocking quartz, feldspar, and mica, commonly with biotite) — igneous

Weathered granite (likely biotite granite)

Granite; interlocking quartz, feldspar, and mica, commonly with biotite

Chert (often called Flint in dark varieties) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (often called Flint in dark varieties)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Biotite granite (weathered granitic rock) (Granite; chiefly quartz (SiO₂), feldspar, and biotite mica) — igneous

Biotite granite (weathered granitic rock)

Granite; chiefly quartz (SiO₂), feldspar, and biotite mica

Granite Glacial Erratic (Intrusive Phaneritic Felsic Rock (Granite)) — igneous

Granite Glacial Erratic

Intrusive Phaneritic Felsic Rock (Granite)

Likely weathered quartz-rich rock fragment (Uncertain; possibly granitic pegmatite or quartz-bearing metamorphic rock) — igneous

Likely weathered quartz-rich rock fragment

Uncertain; possibly granitic pegmatite or quartz-bearing metamorphic rock

Polished yellow jasper or opaque chalcedony bead (Microcrystalline quartz (SiO₂), likely iron-oxide-stained jasper) — mineral

Polished yellow jasper or opaque chalcedony bead

Microcrystalline quartz (SiO₂), likely iron-oxide-stained jasper

Chert Arrowhead (Projectile Point) (Microcrystalline Quartz (Chert or Flint)) — sedimentary

Chert Arrowhead (Projectile Point)

Microcrystalline Quartz (Chert or Flint)

Chert (Jasper/Flint variety) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

Chert (Jasper/Quartzite variety) (Microcrystalline Silica (SiO2)) — sedimentary

Chert (Jasper/Quartzite variety)

Microcrystalline Silica (SiO2)

Sandstone (likely Graywacke or Arkose) (Arenite) — sedimentary

Sandstone (likely Graywacke or Arkose)

Arenite

Quartz and Mixed Sedimentary Rocks (Silicon Dioxide (SiO2) mixed with various clastic sedimentary lithologies) — sedimentary

Quartz and Mixed Sedimentary Rocks

Silicon Dioxide (SiO2) mixed with various clastic sedimentary lithologies

Weathered granite or granitic gneiss pebble (Granite; mainly quartz (SiO₂), feldspar, and mica, with possible gneissic alteration) — igneous

Weathered granite or granitic gneiss pebble

Granite; mainly quartz (SiO₂), feldspar, and mica, with possible gneissic alteration

Basalt (Mafic Igneous Pebble) — igneous

Basalt

Mafic Igneous Pebble

Chert (Black Chert or Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Black Chert or Flint)

Silicon Dioxide (SiO2)

Coquina / Shell Limestone (Coquina (Bioclastic Limestone)) — sedimentary

Coquina / Shell Limestone

Coquina (Bioclastic Limestone)

Chert (specifically Gray Chert) (Silicon Dioxide (SiO2)) — sedimentary

Chert (specifically Gray Chert)

Silicon Dioxide (SiO2)