Rock Identifier

Category

Sedimentary Rock (Specifically A Clastic Sedimentary Rock Formed Into A Cobble)

Browse sedimentary rock (specifically a clastic sedimentary rock formed into a cobble) specimens identified by the Rock Identifier community.

Sandstone with Ironstone Concretion (Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))) — sedimentary

Sandstone with Ironstone Concretion

Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))

Bauxite (Bauxite (Al(OH)3, AlO(OH))) — sedimentary

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Pumice (specifically a water-worn, weathered variety) (Vesicular volcanic glass) — igneous

Pumice (specifically a water-worn, weathered variety)

Vesicular volcanic glass

Limonite Concretion (Goethite-rich Concretion (FeO(OH))) — sedimentary

Limonite Concretion

Goethite-rich Concretion (FeO(OH))

Chert Nodule (Flint) (Chert (Cryptocrystalline Silica - SiO2)) — sedimentary

Chert Nodule (Flint)

Chert (Cryptocrystalline Silica - SiO2)

Fossilized Bone Fragment (Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)) — sedimentary

Fossilized Bone Fragment

Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)

Travertine (Travertine (CaCO3 - Calcium Carbonate)) — sedimentary

Travertine

Travertine (CaCO3 - Calcium Carbonate)

Chert (Iron-stained) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Red Jasper (Silicon Dioxide (SiO2) with Hematite impurities) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Red Jasper (Silicon Dioxide (SiO2) with Hematite impurities) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Selenite (Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O) — mineral

Selenite

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Milky Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Chert (White Chert/Flint) (Chert (SiO2)) — sedimentary

Chert (White Chert/Flint)

Chert (SiO2)

Greenstone (Metamorphosed Mafic Igneous Rock) — metamorphic

Greenstone

Metamorphosed Mafic Igneous Rock

Chert / Flint Nodules in Limestone (Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)) — sedimentary

Chert / Flint Nodules in Limestone

Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)

Pink Opal (Amorphous Hydrous Silica (SiO2·nH2O)) — mineral

Pink Opal

Amorphous Hydrous Silica (SiO2·nH2O)

Garnet Schist (Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)) — metamorphic

Garnet Schist

Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)

Schist (Mica Schist (primarily Muscovite or Biotite sheet silicates)) — metamorphic

Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

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

Jasper

Jasper (Cryptocrystalline Quartz; SiO2)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

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

Puddingstone (Gowganda Tillite/Lorrain Quartzite)

Jasper Conglomerate

Honey Calcite (Calcium Carbonate (CaCO3)) — mineral

Honey Calcite

Calcium Carbonate (CaCO3)

Rough Quartz in Pegmatite Matrix (Quartz (Silicon Dioxide - SiO2) in Granitic Pegmatite) — igneous

Rough Quartz in Pegmatite Matrix

Quartz (Silicon Dioxide - SiO2) in Granitic Pegmatite

Magnetite (Magnetite (Fe3O4)) — mineral

Magnetite

Magnetite (Fe3O4)

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

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Yellow Jasper (Silicon Dioxide (SiO2) with Iron inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Iron inclusions

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

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Limonite Concretion (Ironstone) (Limonite (FeO(OH)·nH2O) / Goethite) — sedimentary

Limonite Concretion (Ironstone)

Limonite (FeO(OH)·nH2O) / Goethite

Fossil Shell (Bivalve) (Class Bivalvia (Likely a member of the Ostreidae or Gryphaeidae family), CaCO3) — sedimentary

Fossil Shell (Bivalve)

Class Bivalvia (Likely a member of the Ostreidae or Gryphaeidae family), CaCO3

Geode Nodules / Chalcedony Geode (Silicon Dioxide (SiO2) - Amorphous to Cryptocrystalline Quartz) — sedimentary

Geode Nodules / Chalcedony Geode

Silicon Dioxide (SiO2) - Amorphous to Cryptocrystalline Quartz

Bauxite (Bauxite (principal ore of aluminum, primarily Al(OH)3)) — sedimentary

Bauxite

Bauxite (principal ore of aluminum, primarily Al(OH)3)

Granite Sand (Decomposed Granite) (Grus / Quartz-Feldspar Detritus) — sedimentary

Granite Sand (Decomposed Granite)

Grus / Quartz-Feldspar Detritus

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

Limestone (Weathered)

Calcium Carbonate (CaCO3)

Rough Agate/Chert Nodules (Cryptocrystalline Quartz (SiO2)) — sedimentary

Rough Agate/Chert Nodules

Cryptocrystalline Quartz (SiO2)

Black Sand (Magnetite Sand) (Magnetite-rich Placers (Fe3O4)) — sedimentary

Black Sand (Magnetite Sand)

Magnetite-rich Placers (Fe3O4)

Jasper with Dendritic Inclusions (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Jasper with Dendritic Inclusions

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chalcedony on Matrix (Silicon Dioxide (SiO2)) — mineral

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Granitic Pegmatite (Coarse-grained Granite (KAlSi3O8 + SiO2)) — igneous

Granitic Pegmatite

Coarse-grained Granite (KAlSi3O8 + SiO2)

Quartz (Milky/Clear variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Unidentifiable Specimen (Undetermined) — Unknown

Unidentifiable Specimen

Undetermined

Carnelian (Red Chalcedony) (Silicon Dioxide (SiO2) - variety of Chalcedony) — mineral

Carnelian (Red Chalcedony)

Silicon Dioxide (SiO2) - variety of Chalcedony

Agate (Chalcedony (cryptocrystalline variety of Quartz, SiO2)) — mineral

Agate

Chalcedony (cryptocrystalline variety of Quartz, SiO2)