Limonite
Hydrous Iron Oxide (often Goethite FeO(OH), Lepidocrocite γ-FeO(OH), and other amorphous iron oxyhydroxides)
Mineral
Category
Mineral With Artificial Coating
Browse mineral with artificial coating specimens identified by the Rock Identifier community.
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Ferruginous Quartz
Silicon Dioxide with Hematite/Limonite impurities (SiO2 + Fe2O3)
mineral
Dyed Agate
Microcrystalline Quartz (SiO2) with artificial pigment
sedimentary
Carved Mottled Greenish-Yellow Crystal/Glass Object
Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.
Man-made Object/Uncertain Mineral
Rainbow Hematite Ring
Iron(III) oxide (Fe2O3) with thin-film coating
mineral
Aura Quartz (specifically Titanium Aura Quartz)
Titanium-coated Silicon Dioxide (SiO2 + Ti Coating)
mineral
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Red Sandstone
Arenite (Iron-rich)
sedimentary
Connemara Marble
Ophiocalcite (Serpentinitic Marble)
metamorphic
Orange Quartz
Silicon Dioxide (SiO2) with iron inclusions
mineral
Angel Aura Quartz (Treated Clear Quartz)
Silicon Dioxide (SiO2) coated with Vaporized Silver and Platinum
mineral
Kambaba Jasper
Stromatolite (Fossilized Algae)
sedimentary
Lapis Lazuli
Lapis Lazuli (Rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)
metamorphic
Siltstone with iron staining
Siltstone (primarily SiO2 with FeO(OH) coatings)
sedimentary
Limonite (Iron Ore)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
mineral
Jasper containing epidote (Unakite-like)
Epidotized Jasper (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Aura Quartz Geode
Titanium/Gold bonded Quartz (SiO2 with metallic coating)
mineral
Scoria (Lava Rock)
Scoria (Vesicular Basaltic Rock)
Igneous
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz Druzy on Basalt
Silicon Dioxide (SiO2) on Mafic Volcanic Rock
Mineral on Igneous Rock
Druzy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Blue Dyed Agate Geode Slice
Chalcedony (Silicon Dioxide, SiO2) with artificial cobalt/iron-based dye
mineral
Milky Quartz with Iron Oxide Weathering
Silicon Dioxide (SiO2) with Goethite/Limonite coatings
mineral
Ammonite Fossil (Polished Section)
Ammonoidea (typically mineralized with Calcite CaCO3)
sedimentary
Cream River Jasper
Silicified microcrystalline quartz (SiO2)
sedimentary
Bismuth
Bismuth (Bi)
mineral
Unakite
Epidotized Granite
metamorphic
Burmese Jadeite (Water Jade)
Jadeite (NaAlSi2O6)
metamorphic
Ferruginous Sandstone (Ironstone Nodules)
Ferruginous Sandstone with Limonite/Goethite coating (Fe2O3·H2O)
sedimentary
Quartzite River Rock (with Limonite staining)
Quartzite (SiO2)
metamorphic
Gossan (with Limonite/Hematite coating)
Ferruginous Gossan (Fe2O3·nH2O / Fe2O3)
sedimentary
Granite with Quartz/Feldspar Vein
Granite
igneous
Pink Cubic Zirconia (CZ)
Zirconium Dioxide (ZrO2)
mineral (synthetic)
Red Sandstone
Arenite (primarily SiO2 with hematite/iron oxide coating)
sedimentary
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
mineral
Propylitic Altered Andesite
Hydrothermally Altered Andesite
igneous
Ferruginous Sandstone (Gozzanous)
SiO2 (Quartz) with FeO(OH) (Goethite) or Fe2O3 (Hematite) coating
sedimentary
Red Sandstone (Old Red Sandstone)
Ferruginous Sandstone (SiO2 + Fe2O3)
sedimentary
Agate (Dyed Blue)
SiO2 (Silicon Dioxide)
Mineral (Chalcedony/Quartz variety)
Mixed Mineral Collection (with Titanium Aura Quartz)
Silicon Dioxide (SiO2) with metallic coatings and various silicates
mineral
Epidote
Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
metamorphic
Rainbow Hematite (Titanium Coated)
Iron(III) oxide (Fe2O3) with Titanium/Metal Oxide coating
mineral