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

Agate (specifically a Blue Agate Geode Slice) (Chalcedony (cryptocrystalline variety of Quartz); SiO2) — mineral

Agate (specifically a Blue Agate Geode Slice)

Chalcedony (cryptocrystalline variety of Quartz); SiO2

Sandstone (Arenite (predominantly SiO2 quartz grains)) — sedimentary

Sandstone

Arenite (predominantly SiO2 quartz grains)

Fossilized Shark Tooth (Carcharocles sp. (likely Lemon or Sand Tiger)) — sedimentary

Fossilized Shark Tooth

Carcharocles sp. (likely Lemon or Sand Tiger)

Polished red jasper (likely hematite-bearing jasper) (Jasper, microcrystalline quartz (SiO₂), colored chiefly by iron oxides such as hematite/goethite) — mineral

Polished red jasper (likely hematite-bearing jasper)

Jasper, microcrystalline quartz (SiO₂), colored chiefly by iron oxides such as hematite/goethite

Fossilized coral (likely honeycomb or branching coral) (Fossil coral; probable Scleractinia or Tabulata, composition mainly microcrystalline CaCO₃) — fossil

Fossilized coral (likely honeycomb or branching coral)

Fossil coral; probable Scleractinia or Tabulata, composition mainly microcrystalline CaCO₃

Pink Granite (Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)) — igneous

Pink Granite

Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)

Sandstone (Weathered Fragment) (Clastic Sedimentary Rock) — sedimentary

Sandstone (Weathered Fragment)

Clastic Sedimentary Rock

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock

Possible basalt pebble (Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene) — igneous

Possible basalt pebble

Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene

Biotite-bearing gneiss or schist (Quartz–feldspar–biotite metamorphic rock) — metamorphic

Biotite-bearing gneiss or schist

Quartz–feldspar–biotite metamorphic rock

Sandstone with Quartz Sphere (Arenite (SiO2-rich sedimentary rock) with Quartzite/Rose Quartz sphere) — sedimentary

Sandstone with Quartz Sphere

Arenite (SiO2-rich sedimentary rock) with Quartzite/Rose Quartz sphere

Druzy Quartz on Host Rock (Silicon Dioxide (SiO2)) — mineral

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2)

Sandstone (Clastic sedimentary rock) — sedimentary

Sandstone

Clastic sedimentary rock

Granite (Phaneritic intrusive igneous rock (consisting mainly of Quartz, Alkali Feldspar, and Plagioclase)) — igneous

Granite

Phaneritic intrusive igneous rock (consisting mainly of Quartz, Alkali Feldspar, and Plagioclase)

Weathered quartz-rich rock, possibly pegmatite or quartzite (Quartz (SiO₂)-rich aggregate; exact identification is uncertain from the photograph) — igneous

Weathered quartz-rich rock, possibly pegmatite or quartzite

Quartz (SiO₂)-rich aggregate; exact identification is uncertain from the photograph

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Fossilized Bone (Petrified Bone) (Permineralized Vertebrate Remains) — sedimentary

Fossilized Bone (Petrified Bone)

Permineralized Vertebrate Remains

Sandstone (Sedimentary Clastic Rock (Quartz Arenite)) — sedimentary

Sandstone

Sedimentary Clastic Rock (Quartz Arenite)

Light-colored chert or weathered limestone (Microcrystalline quartz (SiO₂) or calcitic limestone (CaCO₃); exact identification requires testing) — sedimentary

Light-colored chert or weathered limestone

Microcrystalline quartz (SiO₂) or calcitic limestone (CaCO₃); exact identification requires testing

Iron-stained quartzite (likely) (Quartzite, predominantly quartz (SiO₂), with iron-oxide staining and possible mica/feldspar) — metamorphic

Iron-stained quartzite (likely)

Quartzite, predominantly quartz (SiO₂), with iron-oxide staining and possible mica/feldspar

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

Chert (Flint Nodular)

Silicon Dioxide (SiO2)

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

Chert (Jasper)

Cryptocrystalline Quartz (SiO2)

Coquina or Fossiliferous Limestone (Fossiliferous Calcarenite (CaCO3)) — sedimentary

Coquina or Fossiliferous Limestone

Fossiliferous Calcarenite (CaCO3)

Chalcopyrite (Copper Iron Sulfide (CuFeS2)) — mineral

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Sandstone (Clastic sedimentary rock (primarily quartz arenite)) — sedimentary

Sandstone

Clastic sedimentary rock (primarily quartz arenite)

Sandstone (Micaceous) (Clastic Sedimentary Rock (primarily SiO2 with Mica)) — sedimentary

Sandstone (Micaceous)

Clastic Sedimentary Rock (primarily SiO2 with Mica)

Weathered limestone pebble (Limestone, chiefly calcite (CaCO₃)) — sedimentary

Weathered limestone pebble

Limestone, chiefly calcite (CaCO₃)

Chert (Jasper/Flint variety) (Microcrystalline silicon dioxide (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Microcrystalline silicon dioxide (SiO2)

Quartzite (or Ferruginous Quartzite) (Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 impurities)) — metamorphic

Quartzite (or Ferruginous Quartzite)

Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 impurities)

Shale (Argillite / Shaly Mudstone) — sedimentary

Shale

Argillite / Shaly Mudstone

Rounded brown sandstone or weathered river cobble (Likely quartz-rich sandstone; exact identification requires a fresh surface and tests) — sedimentary

Rounded brown sandstone or weathered river cobble

Likely quartz-rich sandstone; exact identification requires a fresh surface and tests

Quartz-bearing rock fragment (Likely quartz (SiO₂) with iron-oxide staining and possible host-rock grains) — mineral

Quartz-bearing rock fragment

Likely quartz (SiO₂) with iron-oxide staining and possible host-rock grains

Chert (Chalcedony/Agate) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Chalcedony/Agate)

Microcrystalline Quartz (SiO2)

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

Chert (Jasper/Flint Pebble)

Microcrystalline quartz (SiO2)

Rounded quartz-rich river pebble (Quartz-rich sandstone or quartzite; chiefly silicon dioxide (SiO₂)) — sedimentary

Rounded quartz-rich river pebble

Quartz-rich sandstone or quartzite; chiefly silicon dioxide (SiO₂)

Dark rounded pebble, likely basalt (Basalt — fine-grained mafic volcanic rock, mainly plagioclase and pyroxene with possible olivine) — igneous

Dark rounded pebble, likely basalt

Basalt — fine-grained mafic volcanic rock, mainly plagioclase and pyroxene with possible olivine

Sandstone (Clastic Sedimentary Rock (composed mostly of SiO2)) — sedimentary

Sandstone

Clastic Sedimentary Rock (composed mostly of SiO2)

Generic Pebble / Rock Fragment (Lithic fragment / Weathered rock) — sedimentary

Generic Pebble / Rock Fragment

Lithic fragment / Weathered rock

Banded Slate (Slate (Metamorphosed Siltstone/Mudstone)) — metamorphic

Banded Slate

Slate (Metamorphosed Siltstone/Mudstone)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Quartz (Crystal/Druzy Quartz) (Quartz (SiO₂)) — Mineral

Quartz (Crystal/Druzy Quartz)

Quartz (SiO₂)

Quartz Druzy (Geode Fragment) (Silicon Dioxide (SiO2)) — mineral

Quartz Druzy (Geode Fragment)

Silicon Dioxide (SiO2)