Red Sandstone
Sandstone (lithic arenite or arkose with iron oxide)
sedimentary
Category
Anthropogenic (Man Made Material Processed By Nature)
Browse anthropogenic (man made material processed by nature) specimens identified by the Rock Identifier community.
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Banded Calcite (often commercially sold as 'Mexican Onyx' or 'Honey Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Caliche (also known as hardpan, calcrete, kankar)
Primarily composed of calcium carbonate (CaCO₃), often mixed with other minerals like quartz, clay minerals, and iron oxides.
Mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Jasper (Silica-rich microcrystalline Quartz, SiO2 with Fe2O3 impurities)
sedimentary
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Synthetic Sapphire and Ion-X Glass
Single-crystal Alumina (Al2O3) and Ion-strengthened Aluminosilicate Glass
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
N/A - Image is non-geological
Acrylonitrile Butadiene Styrene (ABS) or Polypropylene (PP)
Synthetic material (Plastic/Polymer)
Jasper with Quartz inclusions
Silicon Dioxide (SiO2) - Microcrystalline Chalcedony
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Slag (Industrial Glass Slag)
Amorphous Silicate Glass (often containing Al, Ca, Mg, and Ti oxides)
Mineraloid (Industrial byproduct)
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Fossilized oyster shell
Bivalvia; likely an oyster (Ostreidae), partly mineralized with calcite
fossil
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Red Jasper
Jasper (variety of Chert) - SiO2
sedimentary
BROWN GRANITE (likely 'Tan Brown' or similar)
Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)
igneous
Honey Calcite (Yellow Calcite)
Calcium Carbonate (CaCO3)
mineral
Fossiliferous Limestone
Calcium Carbonate (CaCO3) - Limestone
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (siliciclastic sedimentary rock composed mostly of quartz)
sedimentary
Chert (Jasper/Quartzite river stone)
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Dyed Agate (Tumbled)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Slag Glass
Silicon dioxide with impurities
mineral
Chert (specifically Jasper or Flint variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Red Jasper
Opaque microcrystalline quartz (SiO2) with Hematite inclusions
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Ferro-Manganese Slag
Vitreous Silicate Slag
Anthropogenic (Industrial byproduct)
Coquina
Coquina (Limestone variant)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2), microcrystalline quartz with iron oxide inclusions
sedimentary
Yellow Jasper
Chalcedony/Quartz (SiO2)
sedimentary
Schorl (Black Tourmaline)
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Schorl (Black Tourmaline)
NaFe3Al6(BO3)3Si6O18(OH)4 (Complex Borosilicate)
mineral
Banded agate pendant (likely carnelian or brown-and-white chalcedony agate)
Agate, a banded variety of chalcedony; microcrystalline quartz, SiO₂, with iron-oxide coloration
gemstone
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Shark Tooth Fossil
Carcharocles megalodon or similar extinct shark tooth
fossil
Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')
Calcite (Calcium Carbonate, CaCO3)
Sedimentary