Sandstone
Arenite (often composed of Quartz, SiO2)
sedimentary
Category
Mineral Within A Sedimentary Rock
Browse mineral within a sedimentary rock specimens identified by the Rock Identifier community.
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Chert (Common Opal or Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Sandstone / Fossil Fragment
Fossiliferous Sedimentary Matrix with Indeterminate Fossil Material
fossil
Vuggy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Limestone Concretion (Botryoidal/Calcareous Nodules)
Calcium Carbonate Concretion (CaCO3)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Limonite Concretion
Limonite (Hydrated iron oxide) FeO(OH)·nH2O
sedimentary
Sandstone (Feldspathic / Arkose)
Sandstone (SiO2 with variable mineral grains)
sedimentary
Red jasper (likely polished/tumbled)
Jasper, microcrystalline quartz (SiO₂) colored by iron oxides
mineral
Fossiliferous Limestone containing a Brachiopod or Mollusk Impression
Biogenic Sedimentary Rock / Fossiliferous Limestone
sedimentary
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss
Granitic Gneiss
metamorphic
Chert (and Fossiliferous Chert)
Silicon Dioxide (SiO2)
sedimentary
Pebble with Basaltic and Quartz-rich Banding
Polymictic Lithic Pebble
sedimentary
Fossilized Dinosaur Skull (Tyrannosaurus rex)
Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica
sedimentary
Garnet Gneiss or Mica Schist with Garnet
Almandine Garnet-bearing Gneiss
metamorphic
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Small rounded limestone pebble
Limestone, predominantly calcite (CaCO₃), possibly fossiliferous or oolitic
sedimentary
Sandstone Geode (Unbroken)
Siliciclastic sedimentary rock (primarily Quartz)
sedimentary
Turquoise in Matrix
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Bauxite / Iron-rich Laterite
Laterite (principally Al(OH)3, Fe2O3, and SiO2)
sedimentary
Conglomerate (or Breccia)
Clastic Sedimentary Rock (Conglomeratic)
sedimentary
Ironstone Pebble
Sedimentary Ironstone (Hematite/Limonite-bearing)
sedimentary
Garnet-bearing Schist / Conglomerate Specimen
Metamorphic rock with almandine garnet porphyroblasts
metamorphic
Sandstone (likely Arkosic)
Arenite (SiO2 based)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within Sedimentary host rock
mineral
Ferruginous Sandstone
Sandstone with Iron Oxide (Limonite/Goethite)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Coprolite
Fossilized Feces
fossil
Sandstone Concretion
Carbonate-cemented Sandstone Concretion
sedimentary
Fossiliferous limestone
Bioclastic calcarenite/calcirudite, chiefly calcite (CaCO₃)
sedimentary
Turquoise in Matrix
Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)
mineral
Rounded brown river cobble
Likely iron-stained quartz-rich sandstone or weathered conglomeratic rock; exact identification requires testing
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (SiO2 principal)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a geode
sedimentary
Quartz Druzy (on Geode Fragments)
Silicon Dioxide (SiO2)
mineral