Rock Identifier

Category

Sedimentary (Secondary Formation)

Browse sedimentary (secondary formation) specimens identified by the Rock Identifier community.

Limonite (Ironstone) (Hydrated Iron Oxide (FeO(OH)·nH2O)) — mineral

Limonite (Ironstone)

Hydrated Iron Oxide (FeO(OH)·nH2O)

Lepidolite (Lepidolite [K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2]) — Mineral

Lepidolite

Lepidolite [K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2]

Fossilized Bivalve Shell (Bivalvia (fossil specimen)) — sedimentary

Fossilized Bivalve Shell

Bivalvia (fossil specimen)

Vanadinite on Barite (Pb5(VO4)3Cl (Vanadinite) with BaSO4 (Barite)) — mineral

Vanadinite on Barite

Pb5(VO4)3Cl (Vanadinite) with BaSO4 (Barite)

Dendritic Agate (Blue Chalcedony) (Silicon Dioxide (SiO2)) — sedimentary

Dendritic Agate (Blue Chalcedony)

Silicon Dioxide (SiO2)

Specular Hematite (Specularite) (Iron Oxide (Fe2O3)) — mineral

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Prehnite (Prehnite (Ca2Al2Si3O10(OH)2)) — mineral

Prehnite

Prehnite (Ca2Al2Si3O10(OH)2)

Iron-rich slag or weathered ironstone fragments (Probably hematite–goethite material; possibly industrial iron slag (Fe₂O₃/FeO(OH))) — mineral

Iron-rich slag or weathered ironstone fragments

Probably hematite–goethite material; possibly industrial iron slag (Fe₂O₃/FeO(OH))

Hematite Beads (Iron Oxide (Fe2O3)) — mineral

Hematite Beads

Iron Oxide (Fe2O3)

Agate (Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Agate (Chalcedony)

Silicon Dioxide (SiO2)

Small brown pebble or possible shell fragment (Unidentified natural clast; the image is too small and blurred for reliable identification) — sedimentary

Small brown pebble or possible shell fragment

Unidentified natural clast; the image is too small and blurred for reliable identification

Magnetite or Ironstone Nodule (Magnetite (Fe3O4) or Hematite-rich Sedimentary Nodule) — mineral

Magnetite or Ironstone Nodule

Magnetite (Fe3O4) or Hematite-rich Sedimentary Nodule

Cobaltian Calcite (Cobaltoan Calcite) (Cobaltian Calcite (CaCO3 with Co2+ substitution)) — Mineral

Cobaltian Calcite (Cobaltoan Calcite)

Cobaltian Calcite (CaCO3 with Co2+ substitution)

Chrysocolla on Matrix (Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)) — mineral

Chrysocolla on Matrix

Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)

Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion (Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image) — fossil

Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion

Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image

Quartz Druzy in Chert Pebble (Silicon Dioxide (SiO2) - Microcrystalline & Crystalline Quartz) — sedimentary

Quartz Druzy in Chert Pebble

Silicon Dioxide (SiO2) - Microcrystalline & Crystalline Quartz

Chert (Pebble) (Microcrystalline to Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Pebble)

Microcrystalline to Cryptocrystalline Quartz (SiO2)

Agate (Cryptocrystalline Quartz (SiO2)) — sedimentary

Agate

Cryptocrystalline Quartz (SiO2)

Red Jasper (Silicon Dioxide with Hematite (SiO2 + Fe2O3)) — sedimentary

Red Jasper

Silicon Dioxide with Hematite (SiO2 + Fe2O3)

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

Chert (Jasper influence)

Microcrystalline Quartz (SiO2)

Limonite stained Sandstone (Sedimentary rock with Goethite/Limonite (FeO(OH)·nH2O)) — sedimentary

Limonite stained Sandstone

Sedimentary rock with Goethite/Limonite (FeO(OH)·nH2O)

Limestone (with possible Manganese oxide inclusions) (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone (with possible Manganese oxide inclusions)

Sedimentary Calcium Carbonate (CaCO3)

Native Copper with Cuprite and Quartz (Copper (Cu), Cuprite (Cu2O), Quartz (SiO2)) — mineral

Native Copper with Cuprite and Quartz

Copper (Cu), Cuprite (Cu2O), Quartz (SiO2)

Sandstone Pebble (Sedimentary quartz arenite) — sedimentary

Sandstone Pebble

Sedimentary quartz arenite

Limonite (FeO(OH)·nH2O (Hydrated iron oxide)) — mineral

Limonite

FeO(OH)·nH2O (Hydrated iron oxide)

Chalcedony Geode (Chalcedony (SiO2) within a geode structure) — Mineral Geode/Sedimentary or Volcanic related

Chalcedony Geode

Chalcedony (SiO2) within a geode structure

Mineral Geode/Sedimentary or Volcanic related

Agate (Silicon Dioxide (SiO2)) — sedimentary

Agate

Silicon Dioxide (SiO2)

Carnelian Agate Nodule (Chalcedony (SiO2) with Iron Oxide inclusions) — sedimentary

Carnelian Agate Nodule

Chalcedony (SiO2) with Iron Oxide inclusions

Red Jasper (Jasper (Microcrystalline Quartz, SiO2)) — sedimentary

Red Jasper

Jasper (Microcrystalline Quartz, SiO2)

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

Jasper with Quartz Veins

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Unopened Geode (Geode (containing various mineralization like Quartz SiO2)) — sedimentary

Unopened Geode

Geode (containing various mineralization like Quartz SiO2)

Bloodstone (Heliotrope) (Silicon Dioxide (SiO2) with inclusions of Chlorite or Actinolite) — sedimentary

Bloodstone (Heliotrope)

Silicon Dioxide (SiO2) with inclusions of Chlorite or Actinolite

Pyrite-rich Ore (Pyrite (FeS2) with secondary minerals) — mineral

Pyrite-rich Ore

Pyrite (FeS2) with secondary minerals

Tumbled hematite (Hematite (iron(III) oxide, Fe₂O₃)) — mineral

Tumbled hematite

Hematite (iron(III) oxide, Fe₂O₃)

Iron-rich concretion or weathered ironstone (Limonite/goethite-rich ironstone; commonly hydrated iron oxides (FeO(OH)·nH₂O)) — sedimentary

Iron-rich concretion or weathered ironstone

Limonite/goethite-rich ironstone; commonly hydrated iron oxides (FeO(OH)·nH₂O)

Puddingstone (Gowganda) (Gowganda Formation Conglomerate) — sedimentary

Puddingstone (Gowganda)

Gowganda Formation Conglomerate

Banded Chert (Agate/Jasper blend) (Microcrystalline Quartz (SiO2)) — sedimentary

Banded Chert (Agate/Jasper blend)

Microcrystalline Quartz (SiO2)

Concrete Paver (Artificial Cementitious Rock) (Hydrated Portland Cement Aggregate) — Sedimentary (Synthetic)

Concrete Paver (Artificial Cementitious Rock)

Hydrated Portland Cement Aggregate

Sedimentary (Synthetic)

Chert or Flint (Silicon dioxide (SiO2)) — sedimentary

Chert or Flint

Silicon dioxide (SiO2)

Pitted Sedimentary Rock / Cupstone (Sedimentary rock with weathering pit (arenite / sandstone)) — sedimentary

Pitted Sedimentary Rock / Cupstone

Sedimentary rock with weathering pit (arenite / sandstone)

Mica-rich schist (Mica schist, likely muscovite–biotite schist with quartz) — metamorphic

Mica-rich schist

Mica schist, likely muscovite–biotite schist with quartz

Travertine (Calcium Carbonate (CaCO3)) — sedimentary

Travertine

Calcium Carbonate (CaCO3)