Red Sandstone
Clastic sedimentary rock (primarily Quartz with Hematite)
sedimentary
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
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Quartz geode
Microcrystalline and crystalline quartz, SiO₂, likely with chalcedony and iron-oxide staining
mineral
Weathered sandstone or iron-rich sedimentary rock
Indeterminate siliciclastic sandstone, possibly ferruginous sandstone
sedimentary
Gold in Quartz
Gold (Au) in Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
mineral
Small red-brown mineral or rock fragment
Unidentified; possibly iron-oxide-rich jasper, garnet, or weathered sulfide
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Dalmatian Jasper
Microcrystalline Quartz with Arfvedsonite and Tourmaline
igneous
Granite
Felsic intrusive igneous rock
igneous
Weathered granite
Granite, a quartz–feldspar–mica intrusive igneous rock
igneous
Quartz-rich rock, possibly milky quartz
Quartz (SiO₂), likely a massive quartz specimen; exact identification is uncertain from the image
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Bauxite
Alumina ore (Mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Mixed Rock Assortment
Polylithic geological specimens
sedimentary
Green-gray stone pebble (not reliably identifiable from the image)
Undetermined; possibly a fine-grained sedimentary rock such as mudstone or siltstone
sedimentary
Chalcedony (likely brown agate or flint)
Microcrystalline quartz, SiO₂; chalcedony, possibly iron-stained
mineral
Bauxite
AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Shale
Laminated Mudstone (Shale)
sedimentary
Bauxite
Hydrated aluminum oxides (mixture of gibbsite, boehmite, and diaspore)
sedimentary
Bauxite
Aluminium ore (Hydrated aluminium oxides AlOx(OH)3-2x)
sedimentary
Bauxite
Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)
sedimentary
Mica-rich schist (likely biotite–muscovite schist)
Mica schist; composed chiefly of muscovite and/or biotite with quartz and feldspar
metamorphic
Ferruginous Sandstone
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Petrified Wood
Fossilized Xylem (SiO2)
fossil
Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Micaceous)
Arenite (composed primarily of SiO2)
sedimentary
Quartz Sand Grain / Micro Crystal
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic sedimentary rock
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of Quartz and Potassium Feldspar)
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Dark basalt cobble
Basalt; fine-grained mafic volcanic rock composed chiefly of plagioclase, pyroxene, and commonly olivine
igneous
Green serpentine pebble (possibly serpentine-rich rock)
Serpentinite, composed chiefly of serpentine-group minerals such as antigorite, lizardite, or chrysotile; exact identification requires testing
metamorphic
Quartz with Inclusions
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Arkosic or Lithic Sandstone)
Clastic Sedimentary Rock (SiO2 with assorted minerals)
sedimentary
Ironstone concretion (possibly a limonite/goethite-rich nodule)
Iron-oxide/hydroxide concretion, commonly composed of goethite (α-FeO(OH)) and/or limonite; exact identification requires testing
sedimentary
Limestone
Sedimentary rock composed of Calcium Carbonate (CaCO3)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Quartz-rich gneiss
Foliated quartz–feldspar–mica gneiss, possibly migmatitic
metamorphic