Sandstone
Sedimentary rock composed mainly of sand-sized minerals or rock grains
sedimentary
Category
Sedimentary Rock Or Mineral (Depending On Origin And Purity)
Browse sedimentary rock or mineral (depending on origin and purity) specimens identified by the Rock Identifier community.
Learn about Sedimentary Rock Or Mineral (Depending On Origin And Purity) in the encyclopedia
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Tumbled Black Stone
Unknown (possibly basalt, obsidian, or black jasper)
igneous or sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Rose Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Geode Segment
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz on Host Rock
Silicon Dioxide (SiO2)
Mineral Specimen
Granite Pegmatite with Tourmaline and Muscovite
Pegmatite (Feldspar: KAlSi3O8, Quartz: SiO2, Schorl: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH))
igneous
Red Sandstone
Arenite (with iron oxide cement)
sedimentary
Agate in Matrix
Silicon Dioxide (SiO2) within host rock
mineral
Ammonite fossil
Ammonoidea; likely a Jurassic or Cretaceous ammonite
fossil
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Diamond (Cut Gemstone)
Natural Carbon (C)
gemstone
Sandstone (Quartzose)
Arenite (SiO2 principal)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Sandstone and Mixed Rock Assemblage
Clastic Sedimentary Rock / Quartz Arenite
sedimentary
Limestone or Sandstone Cobble
Sedimentary rock (Calcium carbonate or Quartz based)
sedimentary
Sandstone
Arenite (SiO2 principal component)
sedimentary
Polished fossiliferous stone egg, likely fossiliferous limestone or marble
Unidentified carbonate rock; likely calcite-rich limestone (CaCO₃), possibly fossil-bearing
sedimentary
Sandstone
Arenite
sedimentary
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Petrified Wood
Silicified wood (SiO2)
fossil
Sandstone (Weathered Pebble)
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)
sedimentary
Opal
Hydrated amorphous silica, SiO2·nH2O
gemstone
Dyed turquoise-like gemstone beads
Likely turquoise (hydrous copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O), possibly dyed howlite or magnesite
gemstone
Plume Agate or Moss Agate
Agate (SiO2)
mineral
Quartz (Smoky/Milky variety with inclusion)
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Diamond
Natural Carbon (C)
mineral
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Sandstone
Arenite
sedimentary
Likely garnet-bearing rock (possibly almandine garnet in matrix)
Garnet, likely almandine (Fe₃Al₂Si₃O₁₂); host rock cannot be determined from the image
metamorphic
Ruby (or potential synthetic/imitation)
Corundum (Al2O3)
gemstone
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary Rock
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Quartz Vein in Hematitic Siltstone
Hydrothermal Quartz (SiO2) in Ferriferous Matrix
metamorphic
Sandstone
Arenite
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone Concretion
Septarian Concretion (Nodule)
sedimentary
Sandstone
Arenite (lithic or quartz sandstone)
sedimentary