Sandstone (Ferruginous)
Arenite (primarily SiO2 with Iron Oxide staining)
sedimentary
Category
Mineral With Artificial Coating
Browse mineral with artificial coating specimens identified by the Rock Identifier community.
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Red Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O
mineral
Aggregate Concrete
Anthropogenic Conglomerate (Technosol)
sedimentary
Quartzite with Calcite Tufa
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
metamorphic
Dragon Vein Agate (Dyed)
SiO2
mineral
Amethyst (Hematoid Quartz)
Silicon Dioxide (SiO2) with Ferric Iron inclusions
mineral
Peridot (Olivine)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Red Sandstone Pebble
Arenite with Hematite (Fe2O3) cement
sedimentary
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Dyed Blue Agate Slice
Chalcedony (Silicon Dioxide, SiO2)
mineral
Dyed Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Pink Dyed Agate Geode Slice
Cryptocrystalline Quartz (SiO2)
mineral
Red Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Red Jade (Dyed Quartzite)
Silicon Dioxide (SiO2) - variety Quartzite
metamorphic
Basalt with Desert Varnish
Mafic Igneous Rock with Ferromanganese Coating
igneous
Heat-Treated Citrine (Amethyst-based)
Quartz (Silicon Dioxide) - SiO2
mineral
Pearl
Calcium Carbonate (Aragonite) with Conchiolin; formula: CaCO3
mineral
Druzy Quartz (part of a Geode)
Silicon Dioxide (SiO2)
mineral
Red Quartzite
Tectonically compressed Quartz-rich rock (SiO2)
metamorphic
Limonite-coated Shale
Ferruginous Siliciclastic Shale
sedimentary
Iron Ore (Limonite and Hematite)
Goethite/Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)
mineral
Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
sedimentary
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Limonite (Iron-rich Siltstone / Sandstone base)
Hydrous ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Ferruginous Sandstone
Sandstone (rich in iron oxides/hydroxides)
sedimentary
Quartz Vein Rock
Silicon Dioxide (SiO2)
mineral
Clear Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Sunkissed Quartz or Hematoid Quartz
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
mineral
Ferruginous Quartz (Iron-stained Quartz)
Quartz with Iron Oxide inclusions (SiO2 with Fe2O3)
mineral
Titanium Amethyst Geode
Silicon Dioxide (SiO2) with Titanium/Metal Vapor Deposition Layer
mineral
Red Quartz (Hematoid Quartz)
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
mineral
Kaolinite (Chalky Clay)
Kaolinite (Al2Si2O5(OH)4)
sedimentary
Quartzite (Coldwater or Druzy Quartz over Quartzite)
SiO2 (Silicon Dioxide)
metamorphic
Peacock Ore (Bornite or Iridescent Chalcopyrite)
Bornite (Cu5FeS4) or Acid-treated Chalcopyrite (CuFeS2)
mineral
Cubic Zirconia (Faceted)
Zirconium dioxide (ZrO2)
mineral
Mystic Topaz
Aluminum Silicate Fluoride Hydroxide (Al2SiO4(F,OH)2) with metallic film coating
mineral
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Chalcedony (Tumbled/Cabochon)
Silicon dioxide (SiO2)
mineral