Chert (with Manganese Oxide coating)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Mineral With Artificial Coating
Browse mineral with artificial coating specimens identified by the Rock Identifier community.
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River Rock
Fluvial Cobble (typically Quartzite or Sandstone)
sedimentary
Jasper (Multi-colored) / Sea Glass Slag
Silicon Dioxide (SiO2) with impurities of Iron Oxide
Sedimentary (if natural Jasper) or Artificial (if Slag)
Ironstone (Limonite/Goethite Concretion)
Ferruginous Sedimentary Rock (composed of Goethite FeO(OH) and Limonite)
sedimentary
Slag (Industrial Byproduct)
Anthropogenic Vitreous Silicate material
igneous
Ferrous Slag
Fused calcium-iron silicates (Industrial Slag)
Anthropogenic/Industrial byproduct
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Druzy Quartz on Matrix (Chert/Limestone)
Silicon Dioxide (SiO2) with Carbonate host rock
sedimentary
Dalmatian Stone
Peralkaline Feldsphathic Igneous Rock
igneous
Chalcedony Geode Fragment
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Concrete Fragment
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Banded Calcite (often sold as 'Mexican Onyx')
Calcite (Calcium Carbonate - CaCO3)
sedimentary
Artificial Rock Face (Faux Rock)
Glass Fiber Reinforced Concrete (GFRC)
man-made/construction material
River Quartzite or Chert Pebble
Quartzite (primarily Silicon Dioxide - SiO2)
metamorphic
Man-made Jewelry (Metal and Glass/Plastic)
Synthetic Alloy and Amorphous Solid (SiO2/Polymer)
not a rock
Talc
Talc (Hydrated magnesium silicate, Mg3Si4O10(OH)2)
metamorphic
Ferruginous Sandstone (Iron-rich Sandstone)
Ferruginous Arenite
sedimentary
Scoria
Vesicular Basalt / Scoriaceous Basalt
igneous
Faceted Glass (Costume Jewelry)
Amorphous Silicon Dioxide with colorants (Glass)
Synthetic/Man-made Material
Chert (Flint Pebbles)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (specifically a fragment with Desert Varnish)
Microcrystalline quartz (SiO2)
sedimentary
Red Sandstone
Ferruginous Sandstone (SiO2 dominated with Fe2O3)
sedimentary
Sandstone (Iron-stained)
Sandstone (dominated by Quartz, SiO2, with Iron Oxide impurities)
sedimentary
Basalt with Fusion Crust (Meteorite-like appearance)
Vesicular Basalt
igneous
Red Sandstone
Arenite (composed primarily of SiO2 with Fe2O3 cementation)
sedimentary
Dyed Agate (Tumbled)
Silicon Dioxide (SiO2) - stained microcrystalline quartz
sedimentary
Painted River Rock (likely Quartzite or Granite)
Quartzite or Granitic Gneiss (painted)
metamorphic
Mica Schist
Muscovite Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Eurasite (or Ferruginous Sandstone)
Ferruginous Sandstone (SiO2 with Fe2O3/FeOOH)
sedimentary
Quartzite
Quartzite (primarily SiO2 with iron oxide impurities)
metamorphic
Chert (Flint) with Limestone Coating
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) cortex
sedimentary
Cullet Glass / Slag Glass
Amorphous silica glass
man-made glass / industrial byproduct
Cubic Zirconia (Jewelry Setting)
Cubic Zirconia (ZrO2)
gemstone
Red Tiger's Eye
Silicified Crocidolite (Quartz pseudo-morph after Crocidolite), SiO2
metamorphic
Basalt (Polished River Stone)
Basalt (Extrusive Mafic Volcanic Rock)
igneous
Note: Item is a Synthetic/Man-made Object
Titanium-coated Stainless Steel (Fe-Cr-Ni-Ti)
Non-geological
Cubic Zirconia (CZ)
Cubic Zirconium Dioxide (ZrO2)
gemstone
Blue Agate (Dyed)
Silicon Dioxide (SiO2)
Sedimentary (formed from silica deposits)
Red Sandstone
Clastic sedimentary rock (Quartz arenite/Arkose)
sedimentary
Martian Basalt Rock
Extrusive Mafic Igneous Rock (Basalt)
igneous
Anthracite Coal
Anthracite (Carbon ≥ 86%)
sedimentary
Ferruginous Sandstone with Quartz Inclusions
Clastic Sedimentary Rock (Iron-rich Sandstone)
sedimentary