Spinel
Magnesium Aluminum Oxide (MgAl2O4)
Category
Browse sedimentary (synthetic) specimens identified by the Rock Identifier community.
Spinel
Magnesium Aluminum Oxide (MgAl2O4)
Ruby
Corundum (Al2O3 with Chromium trace)
Rough Ruby
Corundum (Al2O3 with Chromium impurities)
Smoky Quartz
Silicon Dioxide (SiO2)
Rough Emerald (Beryl)
Emerald (Be3Al2(SiO3)6 with Cr/V impurities)
Opalite crescent pendant
Opalite (man-made opalescent glass; not a natural mineral)
Colorless faceted gemstone, likely cubic zirconia
Synthetic cubic zirconia (zirconium dioxide, ZrO₂); identity is visual and not definitive
Rose Quartz and Cherry Quartz (Dyed Glass/Quartz)
Silicon Dioxide (SiO2) with inclusions/dye
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
Opalite
Man-made Glass (Synthetic Opalized Glass)
Bismuth Crystal
Bismuth (element symbol Bi, atomic number 83)
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Faceted pale-green gemstone, likely prasiolite or green quartz
Quartz (SiO₂), likely prasiolite; identification is uncertain from the photograph
Blue Goldstone
Man-made glass with cobalt and metal flecks
Diamond (or Cut Gemstone / Cubic Zirconia)
Carbon (C)
Dyed Purple Agate Sliced Tablet
Silicon Dioxide (SiO2), variety Chalcedony
Opalite
Synthetically produced glass (Silicon Dioxide with metallic inclusions)
Blue Sapphire
Corundum (Al2O3 with Cr, Fe, and Ti trace elements)
Ruby
Corundum (Al2O3)
Blue Sapphire (in a faceted jewelry setting)
Corundum (Al2O3) with trace Iron and Titanium
Ruby
Corundum (Al2O3 with Chromium)
Cherry Quartz with Rose Quartz
Crystalline Quartz (SiO2) with glass-based synthetic components
Opalite
Man-made Glass (SiO2 + additives)
K2 Stone (or K2 Jasper)
Azurite-in-Granite (Potassium Feldspar, Quartz, Plagioclase, Muscovite, and Azurite)
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
Opalite
Synthetic glass (SiO2 + metal additions)
Opalite
Synthetic Opalite (Man-made glass)
Dyed Quartzite
Metamorphosed Quartz (SiO2) with synthetic pigment
Synthetic Resin / Plastic Figurine
Synthetic Polymer (Copolymer of Polyethylene or Resin)
Dyed Crackle Quartz
Silicon Dioxide (SiO2) with synthetic dye
Opalite
Synthetic Opalized Glass (SiO2 + additives)
Opalite (Synthetic Opalized Glass)
Synthetic Silicon Dioxide (SiO2) glass
Goldstone
N/A (Synthetic Glass with Copper Inclusions)
Dyed Agate
Silicon Dioxide (SiO2) with synthetic dyes
Blue faceted gemstones, likely blue sapphire
Corundum (Al₂O₃), blue varieties colored chiefly by iron and titanium
Dyed Agate Geode
Silicon Dioxide (SiO2) with artificial pigment
Carborundum (Silicon Carbide)
Silicon Carbide (SiC)
Cubic Zirconia (Faceted)
Zirconium dioxide (ZrO2)
Cubic Zirconia (Simulated Diamond)
Zirconium dioxide (ZrO2)
Silicon
Crystalline Silicon (Si)
Opalite
Synthetic Glass (Hydrated Silica Simulant)
Blue Goldstone
Synthetic glass with cobalt and copper inclusions