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

Slate (Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)) — metamorphic

Slate

Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)

Mudstone (Lutylite (group of fine-grained sedimentary rocks)) — sedimentary

Mudstone

Lutylite (group of fine-grained sedimentary rocks)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Rounded gray limestone pebble with a calcite vein (Calcitic limestone, composed predominantly of calcite (CaCO₃), locally cut by a white calcite vein) — sedimentary

Rounded gray limestone pebble with a calcite vein

Calcitic limestone, composed predominantly of calcite (CaCO₃), locally cut by a white calcite vein

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Dalmatian Stone (Aplite (often incorrectly called Dalmatian Jasper)) — igneous

Dalmatian Stone

Aplite (often incorrectly called Dalmatian Jasper)

Tumbled granite or granitic pebble (Granite; primarily quartz, feldspar, and mica (exact variety uncertain from the image)) — igneous

Tumbled granite or granitic pebble

Granite; primarily quartz, feldspar, and mica (exact variety uncertain from the image)

Polished green aventurine (Quartzite or quartz-rich rock containing fuchsite mica; mainly SiO₂) — mineral

Polished green aventurine

Quartzite or quartz-rich rock containing fuchsite mica; mainly SiO₂

Gypsum (Alabaster variety) (Calcium sulfate dihydrate (CaSO4·2H2O)) — mineral

Gypsum (Alabaster variety)

Calcium sulfate dihydrate (CaSO4·2H2O)

Granite River Stone (Phaneritic Felsic Igneous Rock) — igneous

Granite River Stone

Phaneritic Felsic Igneous Rock

Basalt with Phenocrysts (Porphyritic Basalt) (Porphyritic Basalt (primarily Plagioclase and Pyroxene)) — igneous

Basalt with Phenocrysts (Porphyritic Basalt)

Porphyritic Basalt (primarily Plagioclase and Pyroxene)

River Stone (likely Basalt or Greywacke) (Basalt with mineral veining) — igneous

River Stone (likely Basalt or Greywacke)

Basalt with mineral veining

Likely greenstone (serpentinized ultramafic rock) (Serpentinite, dominated by serpentine-group minerals (chrysotile/lizardite/antigorite), possibly with chlorite or epidote) — metamorphic

Likely greenstone (serpentinized ultramafic rock)

Serpentinite, dominated by serpentine-group minerals (chrysotile/lizardite/antigorite), possibly with chlorite or epidote

Sandstone (Ferruginous) (Arenite with Iron Oxide (Limonite/Hematite) coating) — sedimentary

Sandstone (Ferruginous)

Arenite with Iron Oxide (Limonite/Hematite) coating

Quartzite River Cobble (Quartzite (dominated by SiO2)) — metamorphic

Quartzite River Cobble

Quartzite (dominated by SiO2)

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

Chert (Jasper)

Silicon Dioxide (SiO2)

Vesicular quartz-rich rock, possibly weathered rhyolite or hydrothermal quartz (Likely quartz (SiO₂) with altered feldspar, iron oxides, and cavities; exact identification requires testing) — igneous

Vesicular quartz-rich rock, possibly weathered rhyolite or hydrothermal quartz

Likely quartz (SiO₂) with altered feldspar, iron oxides, and cavities; exact identification requires testing

Chert (and Petrified Wood) (Silicon Dioxide (SiO2)) — sedimentary

Chert (and Petrified Wood)

Silicon Dioxide (SiO2)

Chalcedony with inclusions (Agate/Quartz) (Silicon Dioxide (SiO2)) — mineral

Chalcedony with inclusions (Agate/Quartz)

Silicon Dioxide (SiO2)

Garnet (Almandine (Fe3Al2(SiO4)3)) — mineral

Garnet

Almandine (Fe3Al2(SiO4)3)

Garnet in Schist or Pegmatite (Almandine Garnet (Fe3Al2(SiO4)3) in host rock) — metamorphic

Garnet in Schist or Pegmatite

Almandine Garnet (Fe3Al2(SiO4)3) in host rock

Sandstone (Sandstone (clastic sedimentary rock)) — Rock

Sandstone

Sandstone (clastic sedimentary rock)

Garnet (likely Almandine) (Almandine (Fe3Al2(SiO4)3)) — mineral

Garnet (likely Almandine)

Almandine (Fe3Al2(SiO4)3)

Porphyritic granite (likely weathered granitic rock) (Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende) — igneous

Porphyritic granite (likely weathered granitic rock)

Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende

Quartz Geode with Calcite (Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)) — mineral

Quartz Geode with Calcite

Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Starfish Fossil (Asteroidea fossil) — fossil

Starfish Fossil

Asteroidea fossil

Quartz Crystal with Inclusions (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal with Inclusions

Silicon Dioxide (SiO2)

Chalcedony (Botryoidal or Geode form) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Botryoidal or Geode form)

Silicon Dioxide (SiO2)

Milky quartz fragment (Quartz (silicon dioxide, SiO₂)) — mineral

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Green aventurine (likely) (Quartzite dominated by quartz (SiO₂), colored green by fuchsite mica or chlorite) — mineral

Green aventurine (likely)

Quartzite dominated by quartz (SiO₂), colored green by fuchsite mica or chlorite

Silicified Snail Fossil (Gastropod (likely replaced by Chalcedony/Quartz - SiO2)) — fossil

Silicified Snail Fossil

Gastropod (likely replaced by Chalcedony/Quartz - SiO2)

Petrified Wood (Silicified Wood (SiO2)) — mineral

Petrified Wood

Silicified Wood (SiO2)

Amber (Rough Baltics/Beach Specimen) (Succinicum (Organic Gemstone - Fossilized Resin)) — mineral

Amber (Rough Baltics/Beach Specimen)

Succinicum (Organic Gemstone - Fossilized Resin)

Weathered river stones, likely basaltic andesite and related volcanic rocks (Fine-grained mafic/intermediate volcanic rocks; commonly basalt (plagioclase + pyroxene ± olivine) or andesite (plagioclase + pyroxene ± amphibole)) — igneous

Weathered river stones, likely basaltic andesite and related volcanic rocks

Fine-grained mafic/intermediate volcanic rocks; commonly basalt (plagioclase + pyroxene ± olivine) or andesite (plagioclase + pyroxene ± amphibole)

Fossiliferous limestone (Bioclastic limestone, composed mainly of calcite (CaCO₃)) — sedimentary

Fossiliferous limestone

Bioclastic limestone, composed mainly of calcite (CaCO₃)

Weathered sandstone pebble (Ferruginous quartz arenite (iron-stained sandstone)) — sedimentary

Weathered sandstone pebble

Ferruginous quartz arenite (iron-stained sandstone)

Chert or flint with chalcedony/quartz veins (Microcrystalline silica: primarily quartz (SiO₂), including chalcedony; possible fossiliferous limestone or silicified material) — sedimentary

Chert or flint with chalcedony/quartz veins

Microcrystalline silica: primarily quartz (SiO₂), including chalcedony; possible fossiliferous limestone or silicified material

Jasper with Hematite Inclusions (Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)) — sedimentary

Jasper with Hematite Inclusions

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)

Chert (Common Opal/Agate inclusion) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Common Opal/Agate inclusion)

Microcrystalline Quartz (SiO2)

Milky quartz with iron-oxide staining (Quartz, silicon dioxide (SiO₂), likely massive milky quartz) — mineral

Milky quartz with iron-oxide staining

Quartz, silicon dioxide (SiO₂), likely massive milky quartz

Granite (likely biotite granite or granodiorite) (Coarse-grained plutonic rock composed mainly of quartz, feldspar, and dark mica/amphibole) — igneous

Granite (likely biotite granite or granodiorite)

Coarse-grained plutonic rock composed mainly of quartz, feldspar, and dark mica/amphibole