Amethyst
Silicon Dioxide (SiO2) with Fe4+ impurities
Category
Browse mineral with artificial coating specimens identified by the Rock Identifier community.
Amethyst
Silicon Dioxide (SiO2) with Fe4+ impurities
Desert Rose
Gypsum (variety Selenite) or Baryte, CaSO4 · 2H2O
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
Amethyst (Chevron or Banded Amethyst)
Silicon Dioxide (SiO2) with trace Iron (Fe)
Smoky Quartz
Silicon Dioxide (SiO2)
Amethyst
Silicon dioxide (SiO2) with iron impurities
Orange Calcite
Calcium Carbonate (CaCO3)
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
Amethyst
Silicon dioxide with iron impurities (SiO2)
Amethyst
Silicon dioxide (SiO2) with iron impurities
Amazonite
Microcline (variety Amazonite), K(AlSi3O8)
Biotite Mica
K(Mg, Fe)3(AlSi3O10)(F, OH)2
Amethyst
Silicon dioxide (SiO2)
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
Amethyst
Silicon Dioxide (SiO2) with iron impurities
Quartz Geode (Chalcedony)
Silicon Dioxide (SiO2)
Amethyst
Silicon Dioxide (SiO2) with iron impurities
Quartz Geode
Crystalline Silicon Dioxide (SiO2)
Amazonite
Microcline (KAlSi3O8)
Amethyst
Silicon Dioxide (SiO2) with Iron impurities
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
Amazonite
Amazonite (Microcline variant: KAlSi3O8)
Quartz Geode Fragment
Silicon Dioxide (SiO2)
Amethyst (Tumbled)
Silicon Dioxide (Quartz) with traces of Iron; SiO2
Tree Agate
Silicon Dioxide (SiO2) with Chlorite inclusions
Quartz Geode
Silicon Dioxide (SiO2)
Lepidolite (Lithium Mica)
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Fluorite
Calcium Fluoride (CaF2)
Amethyst
Silicon Dioxide (SiO2) with iron impurities
Crazy Lace Agate
Chalcedony (SiO2)
Schorl (Black Tourmaline)
Sodium iron aluminum borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
Amazonite
Potassium Feldspar (KAlSi3O8)
Amethyst Geode Piece
Silicon Dioxide (SiO2)
Amazonite
Microcline (KAlSi3O8) with lead impurities
Turquoise (Dyed Howlite/Magnesite)
CuAl6(PO4)4(OH)8·4H2O (Natural Turquoise) or Ca2B5SiO9(OH)5 (Howlite)
Amethyst
Silicon dioxide with iron impurities (SiO2)
Malachite
Malachite (Cu2CO3(OH)2)
Rose Quartz
Silicon Dioxide (SiO2)
Rhodochrosite
Manganese Carbonate (MnCO3)
Peacock Ore
Bornite (Cu5FeS4) or Chalcopyrite treated with acid
Amethyst (Polished Point)
Crystalline Quartz (SiO2 with iron impurities)