Limonite / Ironstone
Hydrated Iron Oxide (FeO(OH)·nH2O)
sedimentary
Category
Sedimentary Mineral
Browse sedimentary mineral specimens identified by the Rock Identifier community.
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Shale
Argillite / Shale
sedimentary
Light-colored limestone
Calcitic limestone; primarily calcium carbonate (CaCO₃), mineral calcite
sedimentary
Aragonite Star Cluster (Cross-section)
Aragonite (Calcium Carbonate, CaCO3)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Halite (Rock Salt)
Halite (Sodium Chloride, NaCl)
mineral
Orange Calcite (Cleavage Rhomb)
Calcite (Calcium Carbonate, CaCO3)
mineral
Sandstone (Iron-stained)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Limonite/Ironstone
Limonite (FeO(OH)·nH2O)
mineral
River Stone (Sandstone or Siltstone)
Sedimentary Rock (Clastic)
sedimentary
Banded Sandstone
Clastic Sedimentary Sandstone
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Pyrite with Quartz
Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)
mineral
Sedimentary Outcrop (Sandstone/Shale)
Sedimentary bedrock formation (variable composition)
sedimentary
Sandstone (with minor weathering/pitting)
Clastic Sedimentary Rock (composed mostly of SiO2)
sedimentary
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Galena
Lead Sulfide (PbS)
mineral
Selenite (Satin Spar)
Gypsum (CaSO4·2H2O)
mineral
Hematite
Iron(III) oxide, Fe2O3
mineral
Gypsum (Alabaster variety)
Calcium sulfate dihydrate (CaSO4·2H2O)
mineral
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone (likely Arkose or Lithic)
Clastic sedimentary rock (SiO2 + impurities)
sedimentary
Banded Gneiss
Gneiss (Felsic to Mafic Metamorphic Rock)
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic sedimentary rock
sedimentary
River Cobble (likely Siltstone or Sandstone)
Clastic Sedimentary Rock
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O
mineral
Quartz Geode
Silicon Dioxide (SiO2) in Calcareous or Siliceous Matrix
mineral
Graphite
Graphite (Carbon, C)
mineral
Ironstone (Limonite/Hematite concretion)
Ferruginous Siltstone / Goethite (FeO(OH))
sedimentary
Limonite (Iron Ore)
Hydrated ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Limonite
FeO(OH)·nH2O
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Sandstone and River Pebbles
Sedimentary Rock (Sandstone / Quartzite / Chert)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Gravel and Sediment Sample
Mixed clastic sediment
sedimentary