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

Chert (Jasper/Carnelian variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Carnelian variety)

Microcrystalline Quartz (SiO2)

Chert Arrowhead (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Arrowhead

Microcrystalline Quartz (SiO2)

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

Chert (Flint) with Glauconite

Microcrystalline Quartz (SiO2)

Sandstone Cobble with Iron Staining (Arenite with Limonite/Hematite staining) — sedimentary

Sandstone Cobble with Iron Staining

Arenite with Limonite/Hematite staining

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Milky quartz (rough quartz specimen) (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz (rough quartz specimen)

Quartz, silicon dioxide (SiO₂)

River Stone (likely Quartzite or Limestone) (Silicon dioxide (SiO2) or Calcium carbonate (CaCO3)) — metamorphic

River Stone (likely Quartzite or Limestone)

Silicon dioxide (SiO2) or Calcium carbonate (CaCO3)

Calcite (likely a tumbled specimen) (Calcite (CaCO
3
)) — Mineral

Calcite (likely a tumbled specimen)

Calcite (CaCO 3 )

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

Quartz (Grain/Pebble)

Silicon Dioxide (SiO2)

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Weathered basalt cobble (Basalt; fine-grained plagioclase–pyroxene rock, commonly with olivine and iron oxides) — igneous

Weathered basalt cobble

Basalt; fine-grained plagioclase–pyroxene rock, commonly with olivine and iron oxides

Fossilized Shark Tooth (Carcharodon carcharias (fossilized) / Hydroxyapatite permineralized with silica or iron) — sedimentary

Fossilized Shark Tooth

Carcharodon carcharias (fossilized) / Hydroxyapatite permineralized with silica or iron

Dark basalt (likely vesicular basalt) (Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine (approx. SiO₂ 45–52%)) — igneous

Dark basalt (likely vesicular basalt)

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine (approx. SiO₂ 45–52%)

Fossilized Shark Tooth (Fragment) in Matrix (Elasmobranchii (subclass)) — fossil

Fossilized Shark Tooth (Fragment) in Matrix

Elasmobranchii (subclass)

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

White Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz (River Pebble) and Chert/Jasper (Silicon Dioxide (SiO2)) — mineral

Quartz (River Pebble) and Chert/Jasper

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Chert / Flint (Arrowhead Artifact) (Microcrystalline quartz (SiO2)) — sedimentary

Chert / Flint (Arrowhead Artifact)

Microcrystalline quartz (SiO2)

Riverstone Jasper (Chert variant) (Silicon Dioxide (SiO2) with impurities) — sedimentary

Riverstone Jasper (Chert variant)

Silicon Dioxide (SiO2) with impurities

Rounded dark igneous pebble, likely basalt (Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase and pyroxene, with possible olivine) — igneous

Rounded dark igneous pebble, likely basalt

Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase and pyroxene, with possible olivine

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite Pebble (Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Quartzite (SiO2)

Mosasaur Tooth Fossil (Mosasauridae (likely Prognathodon or Mosasaurus)) — fossil

Mosasaur Tooth Fossil

Mosasauridae (likely Prognathodon or Mosasaurus)

Likely galena-bearing metamorphic sulfide ore (Galena (PbS), possibly with pyrite and/or sphalerite in a schistose host) — mineral

Likely galena-bearing metamorphic sulfide ore

Galena (PbS), possibly with pyrite and/or sphalerite in a schistose host

Vesicular Basalt (Scoria) (Extrusive Mafic Volcanic Rock (FeO-SiO2-MgO)) — Igneous

Vesicular Basalt (Scoria)

Extrusive Mafic Volcanic Rock (FeO-SiO2-MgO)

Chert or flint fragment (Microcrystalline quartz (SiO₂), commonly called chalcedony or flint) — sedimentary

Chert or flint fragment

Microcrystalline quartz (SiO₂), commonly called chalcedony or flint

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

Chert (Pink Jasper variant)

Microcrystalline Quartz (SiO2)

Weathered basalt (possibly vesicular basalt) (Basalt; predominantly plagioclase, pyroxene, and commonly olivine) — igneous

Weathered basalt (possibly vesicular basalt)

Basalt; predominantly plagioclase, pyroxene, and commonly olivine

Biotite-bearing granite (Granite, composed mainly of quartz (SiO₂), potassium feldspar, plagioclase, and biotite mica) — igneous

Biotite-bearing granite

Granite, composed mainly of quartz (SiO₂), potassium feldspar, plagioclase, and biotite mica

Chert (with Iron Staining) (Silicon Dioxide (SiO2)) — sedimentary

Chert (with Iron Staining)

Silicon Dioxide (SiO2)

Diorite (River Pebble) (Diorite) — igneous

Diorite (River Pebble)

Diorite

Quartzite Cobble (Quartzite (SiO2)) — metamorphic

Quartzite Cobble

Quartzite (SiO2)

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

Sandstone (Painted)

Arenite (primarily SiO2)

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

Granite Pebble

Granite (Felsic intrusive igneous rock)

Siltstone / Slate (Siltstone / Low-grade Slate) — sedimentary

Siltstone / Slate

Siltstone / Low-grade Slate

Weathered basalt or mafic volcanic rock (Basalt; predominantly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides) — igneous

Weathered basalt or mafic volcanic rock

Basalt; predominantly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides

Chalcedony Geode (Silicon Dioxide (SiO2)) — mineral

Chalcedony Geode

Silicon Dioxide (SiO2)

Fossil Shark Tooth (Lamniformes (order) - likely Cretalamna or Carcharias species) — fossil

Fossil Shark Tooth

Lamniformes (order) - likely Cretalamna or Carcharias species

Calcite (likely honey/orange calcite) (Calcite — calcium carbonate, CaCO₃) — mineral

Calcite (likely honey/orange calcite)

Calcite — calcium carbonate, CaCO₃

Rhodonite-bearing metamorphic rock (Manganese-rich metamorphic rock, chiefly rhodonite (MnSiO₃), with quartz and manganese oxides) — metamorphic

Rhodonite-bearing metamorphic rock

Manganese-rich metamorphic rock, chiefly rhodonite (MnSiO₃), with quartz and manganese oxides

Polished granite (Granite; chiefly quartz, feldspar, and mica/amphibole) — igneous

Polished granite

Granite; chiefly quartz, feldspar, and mica/amphibole

Chert (Flint) (Silicon Dioxide (SiO2) - Cryptocrystalline Quartz) — sedimentary

Chert (Flint)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz