Sandstone (likely Graywacke or Lithic Arenite)
Clastic sedimentary rock predominantly composed of silicate grains
sedimentary
Category
Sedimentary (Processed Mineral Product)
Browse sedimentary (processed mineral product) specimens identified by the Rock Identifier community.
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Geode or Concretion
Silica-filled nodule (likely SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone (Red Arkose)
Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Gold in Quartz
Hydrothermal Quartz with Native Gold (SiO2 with Au)
mineral
Sandstone or Quartzite
Arenite (if sedimentary) / Quartzite (if metamorphic)
Sedimentary or Metamorphic
Fluorite
Calcium Fluoride (CaF2)
mineral
Satin Spar (often marketed as Selenite)
Fibrous Gypsum (CaSO4·2H2O)
mineral
Red Quartzite
Quartzite (SiO2)
metamorphic
Blue Dyed Agate
Silicon Dioxide (SiO2)
mineral
Shale
Argillaceous sedimentary rock
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Psilomelane (Black Hematite varietal)
Barium Manganese Oxide (Ba,H2O)2Mn5O10
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Quartz (Silicon Dioxide, SiO2) in a Geode
sedimentary
Magnetic Sand Grain / Magnetite Pellet
Magnetite (Fe3O4)
mineral
Satin Spar (often sold as Selenite)
Gypsum (CaSO4·2H2O)
mineral
Satin Spar (Satin Spar Selenite)
Gypsum (CaSO4·2H2O)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Fossil Shark Tooth
Carcharocles (Otodus) sp. or similar fossilized Chondrichthyes tooth
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Limonite
Limonite (FeOO·nH2O)
mineral
Sandstone Concretion (Omar or Nut Rock)
Sedimentary Concretion (specifically an 'Omarolluk' or Omar)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
sedimentary
Lapis Lazuli
Lazurite-dominant rock, (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2
metamorphic
Chert (or Flint)
Chert (cryptocrystalline quartz), SiO2
Sedimentary
Limonite (Iron Ore)
Limonite; FeO(OH)·nH2O
mineral
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)
Metamorphic Rock
Citrine
SiO2 (Silicon Dioxide)
mineral
Serpentinite
Serpentinite (composed largely of serpentine group minerals including Antigorite, Lizardite, or Chrysotile)
metamorphic
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Ferruginous Sandstone (River Pebble)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Shale with Trace Fossils
Fissile mudrock (Shale)
sedimentary
Sandstone (with potential iron mineralization)
Arenite
sedimentary