Limonite (Yellow Ochre)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
mineral
Category
Mineral With Artificial Coating
Browse mineral with artificial coating specimens identified by the Rock Identifier community.
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Blue Dyed Agate Geode (Slice)
Silicon Dioxide (SiO2) - Chalcedony / Quartz
mineral
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Iron-stained Quartzite / Agate
Silicon Dioxide with Iron Oxides (SiO2 + Fe2O3·nH2O)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Ferric Iron Oxides
mineral
Botryoidal Chalcedony (Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Druzy Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Red Sandstone
Ferruginous Sandstone (SiO2 dominated with Fe2O3 cement)
sedimentary
Quartzite Pebble (with Iron Staining)
Quartzite (SiO2)
metamorphic
Quartz Druze
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Pink Quartz (likely dyed)
Silicon Dioxide (SiO2)
mineral
Glass
Amorphous Silicon Dioxide (SiO2)
mineraloid
Limonite
Limonite (FeO(OH)·nH2O)
mineral
Sandstone with Iron Staining
Arenite (SiO2 with Fe-oxide coatings)
sedimentary
Limonite (Iron Ore)
Hydrated ferric oxide (FeO(OH)·nH2O)
sedimentary
Druzy Quartz on Chert/Siltstone
Silicon Dioxide (SiO2) on Microcrystalline Silica/Siltstone matrix
sedimentary
Ironstone Concretion (Moqui Marble / Boji Stone)
Sedimentary Iron Oxide Concretion (Fe2O3 / FeO(OH))
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Green Chalcedony (likely Green Agate or Chrysoprase)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Mineral
Blue Quartzite (Dyed)
Metamorphosed Quartz-rich Sandstone (SiO2 with organic dye)
metamorphic
Sandstone Cobble with Iron Staining
Arenite with Limonite/Goethite coatings
sedimentary
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral
Limonite-stained Quartz
Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O) coatings
mineral
Gold-bearing Quartz
Native Gold (Au) in Quartz (SiO2) matrix
mineral
Sandstone (Red/Brown Variety)
Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)
sedimentary
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Basalt with Desert Varnish
Mafic Volcanic Rock (Fe/Mg rich silica)
igneous
Heat-Treated Citrine (Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Heat-Treated Amethyst (Commercial Citrine)
Silicon Dioxide (SiO2) with iron impurities
mineral
Chalcedony with Druzy Quartz Geode
Silicon Dioxide (SiO2)
mineral
Pink Quartz (Inclusion-Rich Quartz)
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Ferruginous Sandstone
Iron-rich Clastic Sedimentary Rock
sedimentary
Pink Satin Spar (Satin Spar Selenite Dyed)
Gypsum (CaSO4·2H2O)
mineral
Druzy Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Druzy Geode
Silicon Dioxide (SiO2) - Crystalline Variety
mineral
N/A - Man-made object (Jewelry Chain)
Antiqued or Oxidized Metal Chain (often Steel or Brass)
Mineral (processed metal)
Moqui Marble (Shaman Stone)
Ironstone Concretion (Iron oxide Fe2O3 and FeO(OH))
sedimentary
Dyed Dalmatian Stone
Aplite (Alkali-feldspar granite) with Arfvedsonite
igneous
Iron-stained Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral