Rock Identifier

Category

Rock (Likely Sedimentary)

Browse rock (likely sedimentary) specimens identified by the Rock Identifier community.

Learn about Rock (Likely Sedimentary) in the encyclopedia

Asphalt Rock

Rock Gypsum

Conglomerate

Breccia

Ironstone

Limestone

Claystone

Phosphorite

Chert

Coal

Pisolite

Mudstone

Rounded river pebble (Indeterminate; likely quartz-rich sandstone, chert, or weathered volcanic rock) — sedimentary

Rounded river pebble

Indeterminate; likely quartz-rich sandstone, chert, or weathered volcanic rock

Rounded quartz-rich pebble (Chert or quartzite pebble (tentative; mostly microcrystalline quartz, SiO₂)) — sedimentary

Rounded quartz-rich pebble

Chert or quartzite pebble (tentative; mostly microcrystalline quartz, SiO₂)

Limestone (specifically Grainstone or Micrite) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (specifically Grainstone or Micrite)

Calcium Carbonate (CaCO3)

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

Sandstone

Arenite (SiO2 based with quartz grains)

Sandstone (likely Arkosic) (Clastic Sedimentary Rock (Sandstone)) — sedimentary

Sandstone (likely Arkosic)

Clastic Sedimentary Rock (Sandstone)

Conglomerate (Conglomeratic Sandstone) — sedimentary

Conglomerate

Conglomeratic Sandstone

Yellow Chert (Cherty Pebble) (Silicon Dioxide (SiO2)) — sedimentary

Yellow Chert (Cherty Pebble)

Silicon Dioxide (SiO2)

Smooth gray river pebble (Likely fine-grained sandstone or siltstone; exact identification requires a fresh surface and tests) — sedimentary

Smooth gray river pebble

Likely fine-grained sandstone or siltstone; exact identification requires a fresh surface and tests

Sandstone (likely Conglomerate or Gritstone) (Arenite (SiO2 based)) — sedimentary

Sandstone (likely Conglomerate or Gritstone)

Arenite (SiO2 based)

Quartz Sand/Gravel (Silicon Dioxide (SiO2)) — sedimentary

Quartz Sand/Gravel

Silicon Dioxide (SiO2)

Sandstone (likely Arkosic) (Clastic Sedimentary Rock (primarily SiO2 with Feldspar)) — sedimentary

Sandstone (likely Arkosic)

Clastic Sedimentary Rock (primarily SiO2 with Feldspar)

Quartz (Sunstone-like Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Quartz (Sunstone-like Chalcedony)

Silicon Dioxide (SiO2)

Yellow Chert (Sedimentary cryptocrystalline quartz (SiO2)) — sedimentary

Yellow Chert

Sedimentary cryptocrystalline quartz (SiO2)

Pebble or Cobble (likely composed of sandstone or conglomerate) (Clastic Sedimentary Rock (specific name like sandstone, conglomerate, or breccia would require microscopic analysis of clast size and angularity)) — Sedimentary Rock (possibly a conglomerate or coarse-grained sandstone)

Pebble or Cobble (likely composed of sandstone or conglomerate)

Clastic Sedimentary Rock (specific name like sandstone, conglomerate, or breccia would require microscopic analysis of clast size and angularity)

Sedimentary Rock (possibly a conglomerate or coarse-grained sandstone)

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

Chert (Agatized)

Silicon Dioxide (SiO2)

Banded Agate (Silicon dioxide (SiO2) - variety of Chalcedony) — sedimentary

Banded Agate

Silicon dioxide (SiO2) - variety of Chalcedony

Fossil-bearing sedimentary rock, possibly fossil wood or bone (Indeterminate silicified/carbonate fossil in sandstone or mudstone) — fossil

Fossil-bearing sedimentary rock, possibly fossil wood or bone

Indeterminate silicified/carbonate fossil in sandstone or mudstone

Sandstone (Banded) (Arenite (SiO2 with iron oxide impurities)) — sedimentary

Sandstone (Banded)

Arenite (SiO2 with iron oxide impurities)

Iron-rich brown stone, possibly weathered chert or ironstone (Undetermined; likely iron-oxide-bearing silica-rich rock (chert/ironstone)) — sedimentary

Iron-rich brown stone, possibly weathered chert or ironstone

Undetermined; likely iron-oxide-bearing silica-rich rock (chert/ironstone)

Sandstone (Quartz-rich) (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone (Quartz-rich)

Arenite (composed primarily of SiO2)

Chert (River Cobble) (Chert (Cryptocrystalline Quartz, SiO2)) — sedimentary

Chert (River Cobble)

Chert (Cryptocrystalline Quartz, SiO2)

Sandstone Pebble (Arenite (primarily SiO2)) — sedimentary

Sandstone Pebble

Arenite (primarily SiO2)

Sandstone Pebble (Ventifact) (Arenite (mostly SiO2)) — sedimentary

Sandstone Pebble (Ventifact)

Arenite (mostly SiO2)

Fossiliferous Limestone Pebble (Biogenic Sedimentary Rock (CaCO3)) — fossil

Fossiliferous Limestone Pebble

Biogenic Sedimentary Rock (CaCO3)

Chert (Jasper/Flint variety) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossiliferous Limestone (Calcium Carbonate (CaCO3) with marine fossils) — sedimentary

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with marine fossils

Sandstone (likely Siltstone) (Arenite or Siltstone (high SiO2 content)) — sedimentary

Sandstone (likely Siltstone)

Arenite or Siltstone (high SiO2 content)

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

Sandstone (Pebble)

Arenite (primarily SiO2)

Weathered granite pebble (Granite, mainly quartz, feldspar, and mica; approximate composition SiO₂-rich continental crust) — igneous

Weathered granite pebble

Granite, mainly quartz, feldspar, and mica; approximate composition SiO₂-rich continental crust

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

Chert (Likely Jasper)

Microcrystalline Quartz (SiO2)

Quartz (Grain) (Silicon Dioxide (SiO2)) — mineral

Quartz (Grain)

Silicon Dioxide (SiO2)

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

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Vein-bearing sandstone or quartzite cobble (Quartz-rich sandstone with white quartz veins; possibly metamorphosed to quartzite) — sedimentary

Vein-bearing sandstone or quartzite cobble

Quartz-rich sandstone with white quartz veins; possibly metamorphosed to quartzite

Sandstone (likely Quartzose) (Sandstone (Principally SiO2)) — sedimentary

Sandstone (likely Quartzose)

Sandstone (Principally SiO2)

Quartz Geode (Silicon Dioxide (SiO2) within Sedimentary or Igneous host) — mineral

Quartz Geode

Silicon Dioxide (SiO2) within Sedimentary or Igneous host

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

Sandstone (River Cobble)

Clastic sedimentary rock (primarily SiO2)

Banded Sedimentary Rock (Siltstone/Mudstone with concretion) (Siltstone with Ferruginous Banding) — sedimentary

Banded Sedimentary Rock (Siltstone/Mudstone with concretion)

Siltstone with Ferruginous Banding

Sandstone (Ferruginous) (Arenite with iron oxide cement (Fe2O3)) — sedimentary

Sandstone (Ferruginous)

Arenite with iron oxide cement (Fe2O3)

Quartz Vein in Siltstone (Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix) — metamorphic

Quartz Vein in Siltstone

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix

River Cobble with Algae Patina (Weathered Chert or Quartzite pebble (SiO2 dominated)) — sedimentary

River Cobble with Algae Patina

Weathered Chert or Quartzite pebble (SiO2 dominated)

Unidentified dark pebble (Unknown) — rock

Unidentified dark pebble

Unknown

Pink Chalcedony (Agate/Jasper blend) (Silicon Dioxide (SiO₂)) — mineral

Pink Chalcedony (Agate/Jasper blend)

Silicon Dioxide (SiO₂)