Chalcedony
Cryptocrystalline Quartz (SiO2)
Category
Browse mineral with artificial coating specimens identified by the Rock Identifier community.
Chalcedony
Cryptocrystalline Quartz (SiO2)
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
Sapphire
Corundum (Al2O3)
Orange Calcite
Calcium Carbonate (CaCO3)
Blue Aventurine
Silicon Dioxide (SiO2) containing Dumortierite or Crocidolite inclusions
Fluorite
Calcium Fluoride (CaF2)
Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
Pearl
Biogenic CaCO3 (Aragonite and Calcite)
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
Rutilated Quartz
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
Taaffeite
BeMgAl4O8 (Beryllium Magnesium Aluminum Oxide)
Quartz Geode
Crystalline Quartz (Silicon Dioxide, SiO2)
Malachite
Copper(II) carbonate hydroxide [Cu2CO3(OH)2]
Yellow Aventurine
Quartz (Silicon Dioxide) with Mica inclusions (SiO2)
Garnet
Garnet group: X3Y2(SiO4)3 (commonly Almandine-Pyrope series)
Amethyst Geode
Silicon Dioxide (SiO2) with iron impurities
Quartz Pebble
Silicon Dioxide (SiO2)
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
Carnelian Agate
Carnelian (Silicon Dioxide - SiO2 with Fe impurities)
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
Pyrite
Iron Disulfide (FeS2)
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in sedimentary/volcanic host
Amethyst
Silicon Dioxide (SiO2) with iron impurities
Amazonite
Potassium Feldspar (Microcline) - K(AlSi3O8)
Fluorite
Calcium Fluoride (CaF2)
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
Silver (Native or Alloyed)
Ag (Argentum)
Smoky Quartz
Silicon Dioxide (SiO₂)
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Quartz Geode Fragment
Silicon Dioxide (SiO2) in a Sedimentary Host
Turquoise (likely stabilized or simulated Howlite)
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
Quartz (Druzy/Macro-crystalline)
Silicon Dioxide (SiO2)
Heliotrope (Bloodstone)
Cryptocrystalline Quartz (SiO2) with inclusions of Hematite (Fe2O3)
Quartz (Microcrystalline variety)
Silicon Dioxide (SiO2)
Lepidolite Polished Point
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
Smoky Quartz
Silicon Dioxide (SiO2)
Milky Quartz Pebble
Silicon Dioxide (SiO2)
Green Fluorite
Calcium Fluoride (CaF2)
Chalcedony (Agatized Coral / Rough Chalcedony Node)
Silicon Dioxide (SiO2)
Pyrite in Quartz
Iron Disulfide (FeS2) in Silicon Dioxide (SiO2)