Limonite / Ironstone
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Category
Sedimentary Mineral
Browse sedimentary mineral specimens identified by the Rock Identifier community.
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Geode Nodule Fragment
Quartz / Chalcedony Nodule
sedimentary
Magnetite or Ironstone Nodule
Magnetite (Fe3O4) or Hematite-rich Sedimentary Nodule
mineral
Likely banded gneiss
Gneiss (quartz–feldspar–mica-rich rock; exact identification uncertain from the photo)
metamorphic
Banded gneiss
Foliated gneiss, likely quartz–feldspar–mica gneiss
metamorphic
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Sandstone
Clastic sedimentary rock (primarily quartz arenite)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Apatite
Ca5(PO4)3(F,Cl,OH)
mineral
Siltstone Pebble with Veining
Siltstone
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone
Arenite
sedimentary
Sedimentary Pebble
Sedimentary Rock Fragment
sedimentary
Sandstone (Weathered Fragment)
Clastic Sedimentary Rock
sedimentary
Brown Sandstone
Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)
sedimentary
Galena
Lead Sulfide (PbS)
mineral
Sandstone
Arenite
sedimentary
Banded river pebble
Likely banded sandstone or siltstone; exact identification requires testing
sedimentary
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Polished fossil-bearing shale or mudstone
Fossiliferous carbonaceous mudstone/shale; visible fossils may be bivalves or ammonites, but species cannot be confirmed from the image
fossil
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Shale / Mudstone
Laminated Mudrock (Siliciclastic Sedimentary Rock)
sedimentary
Likely bituminous coal
Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed from the image
sedimentary
Banded sandstone
Quartz-rich sandstone (quartz arenite or feldspathic sandstone; exact type cannot be determined from the image)
sedimentary
Selenite / Gypsum
Gypsum (CaSO4·2H2O)
Mineral
Shale / Mudstone
Sedimentary rock (Claystone / Mudstone / Shale)
sedimentary
Banded Sedimentary Rock
Sedimentary rock with Liesegang banding
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Satin Spar (Gypsum)
Hydrous Calcium Sulfate (CaSO4·2H2O)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Arenite (SiO2 dominant)
sedimentary
Sandstone (Ferruginous)
Clastic sedimentary rock (SiO2 with Fe2O3)
sedimentary
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Sandstone (Quartz-rich)
Arenite (SiO2)
sedimentary
Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Conglomerate / Breccia Matrix (Aggregated Rock)
Sedimentary Breccia / Conglomerate
sedimentary
General Rock and Mineral Collection (Center: Angelite / Blue Anhydrite)
Anhydrite (Calcium Sulfate, CaSO4)
Mineral