Rock Identifier

Category

Mineral, Often Found In Sedimentary Deposits

Browse mineral, often found in sedimentary deposits specimens identified by the Rock Identifier community.

Limonite (Iron Ore/Sandstone mixture) (Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix) — mineral

Limonite (Iron Ore/Sandstone mixture)

Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix

Picture Jasper (Silicon dioxide (SiO2)) — sedimentary

Picture Jasper

Silicon dioxide (SiO2)

Banded Agate (Jasper-Agate) (Silicon Dioxide (SiO₂)) — Mineral

Banded Agate (Jasper-Agate)

Silicon Dioxide (SiO₂)

Magnetite / Ironstone (Magnetite (Fe3O4)) — mineral

Magnetite / Ironstone

Magnetite (Fe3O4)

Blue Calcite (Calcite (Calcium Carbonate, CaCO3)) — mineral

Blue Calcite

Calcite (Calcium Carbonate, CaCO3)

Quartz Geode (partially opened) (Silicon Dioxide (SiO2) with iron staining) — mineral

Quartz Geode (partially opened)

Silicon Dioxide (SiO2) with iron staining

Agate (Moss or Banded Agate variety) (Agate (Silicon Dioxide - SiO2)) — mineral

Agate (Moss or Banded Agate variety)

Agate (Silicon Dioxide - SiO2)

Green Aventurine (Aventurine Quartz (SiO2 with inclusions of Fuchsite)) — metamorphic

Green Aventurine

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Sandstone (Arenite (primarily Quartz, SiO2)) — sedimentary

Sandstone

Arenite (primarily Quartz, SiO2)

Sandstone (likely Arkosic) (Clastic Sedimentary Rock (primarily SiO2 with Feldspar)) — sedimentary

Sandstone (likely Arkosic)

Clastic Sedimentary Rock (primarily SiO2 with Feldspar)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Limonite and Goethite encrusted Chert/Ironstone (Hydrated Iron Oxide (FeO(OH)·nH2O) with cryptocrystalline Silica (SiO2)) — sedimentary

Limonite and Goethite encrusted Chert/Ironstone

Hydrated Iron Oxide (FeO(OH)·nH2O) with cryptocrystalline Silica (SiO2)

Jasper (Iron-rich) (Silicon Dioxide (SiO2) with Fe2O3 (Hematite) impurities) — sedimentary

Jasper (Iron-rich)

Silicon Dioxide (SiO2) with Fe2O3 (Hematite) impurities

Septarian Nodule (Siderite or Calcite Concretion) — sedimentary

Septarian Nodule

Siderite or Calcite Concretion

Jasper (Yellow/Brown) (Silicon Dioxide (SiO2) with impurities) — mineral

Jasper (Yellow/Brown)

Silicon Dioxide (SiO2) with impurities

Sandstone (Sandstone (composed primarily of sand-sized minerals or rock grains)) — sedimentary

Sandstone

Sandstone (composed primarily of sand-sized minerals or rock grains)

Bauxite (Bauxite (Al2O3·2H2O)) — sedimentary

Bauxite

Bauxite (Al2O3·2H2O)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Red Sandstone (Clastic Sedimentary Mineraloid (predominantly Quartz grains with Iron Oxide cement)) — sedimentary

Red Sandstone

Clastic Sedimentary Mineraloid (predominantly Quartz grains with Iron Oxide cement)

Pyrite (Fool's Gold) (Iron Sulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Chert (Jasper/Flint variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Kyanite (Purple variety) (Kyanite (Al₂SiO₅)) — metamorphic

Kyanite (Purple variety)

Kyanite (Al₂SiO₅)

Pyrite (Fool's Gold) (Iron Sulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Chert (often referred to as Flint or Jasper) (Chalcedony (SiO2) - Silicon Dioxide) — sedimentary

Chert (often referred to as Flint or Jasper)

Chalcedony (SiO2) - Silicon Dioxide

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

Banded Agate

Chalcedony (Silicon Dioxide, SiO2)

Septarian Nodule (Septarian concretion (Complex mixture of Siderite, Calcite, and Aragonite)) — sedimentary

Septarian Nodule

Septarian concretion (Complex mixture of Siderite, Calcite, and Aragonite)

Precious Opal (Hydrated Silica (SiO2·nH2O)) — mineral

Precious Opal

Hydrated Silica (SiO2·nH2O)

Green Fluorite (likely synthetic or heat-treated for jewelry) (Calcium Fluoride (CaF2)) — mineral

Green Fluorite (likely synthetic or heat-treated for jewelry)

Calcium Fluoride (CaF2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

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

Chert (Flint variety)

Microcrystalline Quartz (SiO2)

Fluorite (Rainbow Fluorite) (Calcium Fluoride (CaF2)) — Mineral

Fluorite (Rainbow Fluorite)

Calcium Fluoride (CaF2)

Fossilized Coral (Cnidaria (Anthozoa), often replaced by Calcium Carbonate (CaCO3) or Silica (SiO2)) — sedimentary

Fossilized Coral

Cnidaria (Anthozoa), often replaced by Calcium Carbonate (CaCO3) or Silica (SiO2)

Chert (Flint) (Chert (SiO2)) — sedimentary

Chert (Flint)

Chert (SiO2)

Fossilized Shark Tooth (Cretaceous to Neogene) (Elasmobranchii dental fossil (likely Squalicorax or similar species)) — mineral (biogenic replacement)

Fossilized Shark Tooth (Cretaceous to Neogene)

Elasmobranchii dental fossil (likely Squalicorax or similar species)

mineral (biogenic replacement)

Chert (Silicon dioxide (SiO2)) — Sedimentary

Chert

Silicon dioxide (SiO2)

Petrified Wood (Silicified wood (Quartz/Chalcedony replacement of organic matter)) — sedimentary

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement of organic matter)

Sandstone (likely Arkose or Quartz Sandstone) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (likely Arkose or Quartz Sandstone)

Clastic sedimentary rock (primarily SiO2)

Carnelian (Carnelian (Silicon Dioxide - SiO2)) — mineral

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Quartz Geode (Silicon Dioxide (SiO2) within a secondary sedimentary structure) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2) within a secondary sedimentary structure

Pyrite (Fool's Gold) (Iron Disulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Calcite (Calcium Carbonate (CaCO3)) — mineral

Calcite

Calcium Carbonate (CaCO3)