Rock Identifier

Category

Sedimentary

Browse sedimentary specimens identified by the Rock Identifier community.

Learn about Sedimentary in the encyclopedia

Argillite

Arkose

Banded Iron Formation

Banded Iron Formation

Bauxite

Bituminous Coal

Bituminous Coal

Bituminous Shale

Bituminous Shale

Black Shale

Bog Iron

Breccia

Brecciated Jasper

Brecciated Jasper

Bumblebee Jasper

Bumblebee Jasper

Calcarenite

Sandstone with Iron Oxide Coating (Arenite (SiO2 with Fe2O3 impurities)) — sedimentary

Sandstone with Iron Oxide Coating

Arenite (SiO2 with Fe2O3 impurities)

Conglomerate (Conglomerate rock) — sedimentary

Conglomerate

Conglomerate rock

Sandstone (Ferruginous) (Arenite (with Goethite/Limonite cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (with Goethite/Limonite cement)

Banded Slate Pebble (Metamorphosed Mudstone / Slate) — metamorphic

Banded Slate Pebble

Metamorphosed Mudstone / Slate

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Iron-stained quartz-rich rock (likely sandstone) (Quartz-rich sandstone; exact identification is uncertain from the image) — sedimentary

Iron-stained quartz-rich rock (likely sandstone)

Quartz-rich sandstone; exact identification is uncertain from the image

Fossiliferous limestone (Fossil-bearing calcitic limestone (primarily calcite, CaCO₃)) — sedimentary

Fossiliferous limestone

Fossil-bearing calcitic limestone (primarily calcite, CaCO₃)

Ironstone pebble (Iron-oxide-cemented sediment, likely hematite- or goethite-rich) — sedimentary

Ironstone pebble

Iron-oxide-cemented sediment, likely hematite- or goethite-rich

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

Milky quartz

Quartz, silicon dioxide (SiO₂)

Banded gneiss (likely biotite-bearing) (Gneiss; quartz–feldspar–mica assemblage, with possible iron-oxide staining) — metamorphic

Banded gneiss (likely biotite-bearing)

Gneiss; quartz–feldspar–mica assemblage, with possible iron-oxide staining

Banded gneiss (likely garnet-biotite or quartz-feldspar gneiss) (Gneiss; predominantly quartz (SiO₂), feldspar, and dark biotite/amphibole) — metamorphic

Banded gneiss (likely garnet-biotite or quartz-feldspar gneiss)

Gneiss; predominantly quartz (SiO₂), feldspar, and dark biotite/amphibole

Banded Iron Formation (Banded Iron Formation (BIF)) — sedimentary

Banded Iron Formation

Banded Iron Formation (BIF)

Felsic gneiss, likely granitic gneiss (Quartz–feldspar–mica gneiss; commonly quartz + plagioclase/K-feldspar + biotite or hornblende) — metamorphic

Felsic gneiss, likely granitic gneiss

Quartz–feldspar–mica gneiss; commonly quartz + plagioclase/K-feldspar + biotite or hornblende

Granite (Felsic intrusive igneous rock) — igneous

Granite

Felsic intrusive igneous rock

Sandstone (Ferruginous) (Sandstone (primarily SiO2 with Iron Oxide cement)) — sedimentary

Sandstone (Ferruginous)

Sandstone (primarily SiO2 with Iron Oxide cement)

Fossilized Insect in Nodular Matrix (Invertebrata / Insecta fossil in sedimentary concretion) — fossil

Fossilized Insect in Nodular Matrix

Invertebrata / Insecta fossil in sedimentary concretion

Brachiopod Fossil in Sedimentary Rock (Phylum Brachiopoda fossil imprint in sedimentary matrix) — fossil

Brachiopod Fossil in Sedimentary Rock

Phylum Brachiopoda fossil imprint in sedimentary matrix

Limestone Pebble (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone Pebble

Sedimentary Calcium Carbonate (CaCO3)

Sandstone Pebble (Sedimentary Rock (Quartzose Sandstone)) — sedimentary

Sandstone Pebble

Sedimentary Rock (Quartzose Sandstone)

Painted River Rock (Artificially Coated Sedimentary Rock) — sedimentary

Painted River Rock

Artificially Coated Sedimentary Rock

Sandstone (Arenite (SiO2 composition primarily)) — sedimentary

Sandstone

Arenite (SiO2 composition primarily)

Jasper (Microcrystalline Quartz (SiO2)) — mineral

Jasper

Microcrystalline Quartz (SiO2)

Quartz Crystal (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal

Silicon Dioxide (SiO2)

Jasper (Silicon Dioxide (Microcrystalline Quartz, SiO2)) — sedimentary

Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Tumbled yellow jasper or chert (Microcrystalline quartz (SiO₂), likely iron-oxide-stained chalcedony/chert) — mineral

Tumbled yellow jasper or chert

Microcrystalline quartz (SiO₂), likely iron-oxide-stained chalcedony/chert

Weathered iron-rich rock (possibly ironstone) (Indeterminate ferruginous rock; likely iron-oxide-cemented sandstone or ironstone) — sedimentary

Weathered iron-rich rock (possibly ironstone)

Indeterminate ferruginous rock; likely iron-oxide-cemented sandstone or ironstone

Weathered sandstone fragment (Clastic sandstone, composed mainly of quartz and feldspar grains cemented by silica, calcite, or iron oxides) — sedimentary

Weathered sandstone fragment

Clastic sandstone, composed mainly of quartz and feldspar grains cemented by silica, calcite, or iron oxides

Small brown quartz-rich pebble, possibly chert or jasper (Microcrystalline quartz (SiO₂), tentative) — mineral

Small brown quartz-rich pebble, possibly chert or jasper

Microcrystalline quartz (SiO₂), tentative

Fossil Brachiopod or Mollusk Cast (Phylum Brachiopoda / Mollusca internal mold) — fossil

Fossil Brachiopod or Mollusk Cast

Phylum Brachiopoda / Mollusca internal mold

Geode (Quartz nodule / Chalcedony-lined cavity) — sedimentary

Geode

Quartz nodule / Chalcedony-lined cavity

Sandstone (Sedimentary rock composed mainly of quartz sand grains) — sedimentary

Sandstone

Sedimentary rock composed mainly of quartz sand grains

Banded sedimentary concretion (Likely a carbonate (calcite-rich) concretion with concentric mineral bands; exact composition cannot be confirmed from the image) — sedimentary

Banded sedimentary concretion

Likely a carbonate (calcite-rich) concretion with concentric mineral bands; exact composition cannot be confirmed from the image

Rounded sedimentary pebble (Likely micritic limestone or calcareous sandstone) — sedimentary

Rounded sedimentary pebble

Likely micritic limestone or calcareous sandstone

Sandstone (Sedimentary Rock) (Arenite (SiO2 based)) — sedimentary

Sandstone (Sedimentary Rock)

Arenite (SiO2 based)

Chalk (Sedimentary Limestone) (Calcite (CaCO3)) — sedimentary

Chalk (Sedimentary Limestone)

Calcite (CaCO3)

Banded Sedimentary Rock (Stratified Siliciclastic / Arenite or Siltstone with Mineral Bands) — sedimentary

Banded Sedimentary Rock

Stratified Siliciclastic / Arenite or Siltstone with Mineral Bands

Weathered Sedimentary Rock with Liesegang Rings (Sandstone or Siltstone with Iron Oxide Banding) — sedimentary

Weathered Sedimentary Rock with Liesegang Rings

Sandstone or Siltstone with Iron Oxide Banding

Chert (Chert (Microcrystalline Quartz)) — sedimentary

Chert

Chert (Microcrystalline Quartz)

Weathered iron-rich concretion or sedimentary rock (Likely ferruginous sandstone or ironstone concretion; exact identification is not possible from the image alone) — sedimentary

Weathered iron-rich concretion or sedimentary rock

Likely ferruginous sandstone or ironstone concretion; exact identification is not possible from the image alone

Conglomerate (Red Sandstone variety) (Clastic Sedimentary Rock (Conglomeratic Sandstone)) — sedimentary

Conglomerate (Red Sandstone variety)

Clastic Sedimentary Rock (Conglomeratic Sandstone)

Polished fossiliferous chert or silicified limestone pebble (Microcrystalline quartz (SiO₂), possibly with calcite and iron-oxide inclusions) — sedimentary

Polished fossiliferous chert or silicified limestone pebble

Microcrystalline quartz (SiO₂), possibly with calcite and iron-oxide inclusions

Puddingstone (Gowganda Tillite/Lorrain Quartzite) (Jasper Conglomerate) — sedimentary

Puddingstone (Gowganda Tillite/Lorrain Quartzite)

Jasper Conglomerate