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

Biotite-rich granite or granitic gneiss (Granite; quartz–feldspar–biotite assemblage) — igneous

Biotite-rich granite or granitic gneiss

Granite; quartz–feldspar–biotite assemblage

Mixed Mineral Collection (with Quartz, Beryl, and host rock) (Silicon Dioxide (Quartz), Be3Al2Si6O18 (Beryl), and associated Schist/Pegmatite) — mineral

Mixed Mineral Collection (with Quartz, Beryl, and host rock)

Silicon Dioxide (Quartz), Be3Al2Si6O18 (Beryl), and associated Schist/Pegmatite

Limestone (Riprap) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (Riprap)

Calcium Carbonate (CaCO3)

Tumbled Granite (Granite (Felsic intrusive igneous rock)) — igneous

Tumbled Granite

Granite (Felsic intrusive igneous rock)

Basalt Pebble (Basalt (Mafic Extrusive Volcanic Rock)) — igneous

Basalt Pebble

Basalt (Mafic Extrusive Volcanic Rock)

Basalt Riverstone (Basalt (Aphanitic Mafic Volcanic Rock)) — igneous

Basalt Riverstone

Basalt (Aphanitic Mafic Volcanic Rock)

Basalt (River Stone) (Basalt (SiO2 range 45-52%)) — igneous

Basalt (River Stone)

Basalt (SiO2 range 45-52%)

Granodiorite (Intermediate Phaneritic Plutonic Rock) — igneous

Granodiorite

Intermediate Phaneritic Plutonic Rock

Black-and-white gneiss (Gneiss, chiefly quartz–feldspar with dark biotite/amphibole bands) — metamorphic

Black-and-white gneiss

Gneiss, chiefly quartz–feldspar with dark biotite/amphibole bands

Orbicular granite (likely larvikite or related granitic rock) (Granite composed mainly of quartz, feldspar, and dark mafic minerals; exact variety is uncertain from the image) — igneous

Orbicular granite (likely larvikite or related granitic rock)

Granite composed mainly of quartz, feldspar, and dark mafic minerals; exact variety is uncertain from the image

Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

Fossilized Brachiopod or Gastropod in Chert/Limestone (Phylum Brachiopoda / Mollusca) — fossil

Fossilized Brachiopod or Gastropod in Chert/Limestone

Phylum Brachiopoda / Mollusca

Gravel Pebble (Likely Quartzite or Basalt) (Quartzite (or Macrocrystalline Quartz)) — metamorphic

Gravel Pebble (Likely Quartzite or Basalt)

Quartzite (or Macrocrystalline Quartz)

Chalcedony (Dyed Agate and Citrine-style Quartz) (Silicon Dioxide (SiO2)) — gemstone

Chalcedony (Dyed Agate and Citrine-style Quartz)

Silicon Dioxide (SiO2)

Quartzite (with Quartz Veining) (Quartzite (SiO2)) — metamorphic

Quartzite (with Quartz Veining)

Quartzite (SiO2)

Likely weathered brown quartz-bearing rock (Tentatively weathered granite or granitic gneiss; exact identification is uncertain from the photograph) — igneous

Likely weathered brown quartz-bearing rock

Tentatively weathered granite or granitic gneiss; exact identification is uncertain from the photograph

River Quartz Pitting/Cobble (Silicon Dioxide (SiO2)) — mineral

River Quartz Pitting/Cobble

Silicon Dioxide (SiO2)

Pink Granite (Phaneritic Granitoid (K-Feldspar rich)) — igneous

Pink Granite

Phaneritic Granitoid (K-Feldspar rich)

Limestone with Calcite Veins (Calcium Carbonate (CaCO3)) — sedimentary

Limestone with Calcite Veins

Calcium Carbonate (CaCO3)

Black tumbled stone, likely basalt or black jasper (Most consistent with fine-grained basalt (mainly plagioclase and pyroxene); exact identification requires testing) — igneous

Black tumbled stone, likely basalt or black jasper

Most consistent with fine-grained basalt (mainly plagioclase and pyroxene); exact identification requires testing

Weathered granitic rock (Granite, likely quartz–feldspar–mica aggregate) — igneous

Weathered granitic rock

Granite, likely quartz–feldspar–mica aggregate

Granite (Phaneritic plutonic felsic igneous rock) — igneous

Granite

Phaneritic plutonic felsic igneous rock

Common Opal (Hydrated silica (SiO2 "n"H2O)) — mineral

Common Opal

Hydrated silica (SiO2 "n"H2O)

Chalcedony (River Pebble) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (River Pebble)

Silicon Dioxide (SiO2)

Jasper (Jasper (Silicate - SiO2)) — sedimentary

Jasper

Jasper (Silicate - SiO2)

Limestone (CaCO3 (Calcium Carbonate)) — sedimentary

Limestone

CaCO3 (Calcium Carbonate)

Unidentified gray rock/mineral specimen (Indeterminate; possibly quartz-rich rock or a metallic sulfide-bearing specimen) — mineral

Unidentified gray rock/mineral specimen

Indeterminate; possibly quartz-rich rock or a metallic sulfide-bearing specimen

Basalt (Basalt (Extrusive Mafic Igneous Rock)) — igneous

Basalt

Basalt (Extrusive Mafic Igneous Rock)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartz-rich metamorphic rock, likely quartzite (Quartzite (mostly microcrystalline quartz, SiO₂), possibly mica-bearing) — metamorphic

Quartz-rich metamorphic rock, likely quartzite

Quartzite (mostly microcrystalline quartz, SiO₂), possibly mica-bearing

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Green Calcite (Calcium Carbonate (CaCO3)) — mineral

Green Calcite

Calcium Carbonate (CaCO3)

Porphyritic Basalt or Andesite (Porphyritic Basalt/Andesite) — Igneous

Porphyritic Basalt or Andesite

Porphyritic Basalt/Andesite

Quartz-rich vein rock, likely milky quartz in weathered host rock (Milky quartz (SiO₂), probably with weathered feldspar and iron-oxide staining) — igneous

Quartz-rich vein rock, likely milky quartz in weathered host rock

Milky quartz (SiO₂), probably with weathered feldspar and iron-oxide staining

Fossilized Shark Tooth (Selachii (Elasmobranchii subclass)) — fossil

Fossilized Shark Tooth

Selachii (Elasmobranchii subclass)

Chert (often called Flint or River Pebble) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (often called Flint or River Pebble)

Microcrystalline Quartz (SiO2)

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

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

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Weathered granitic rock (Granite, likely biotite granodiorite) — igneous

Weathered granitic rock

Granite, likely biotite granodiorite

Clear Quartz Crystal on Matrix (SiO2 (Silicon Dioxide)) — mineral

Clear Quartz Crystal on Matrix

SiO2 (Silicon Dioxide)

Marine invertebrate fossils (Brachiopods and Gastropods) (Phylum Brachiopoda and Class Gastropoda) — fossil

Marine invertebrate fossils (Brachiopods and Gastropods)

Phylum Brachiopoda and Class Gastropoda

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

Chert (Jasper variety)

Silicon Dioxide (SiO2)