Silicon Carbide (Carborundum)
Silicon Carbide (SiC)
mineral
Category
Synthetic (Glass)
Browse synthetic (glass) specimens identified by the Rock Identifier community.
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Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Ruby (in jewelry)
Corundum (Al2O3 with Chromium traces)
mineral
Bituminous Coal
Organic-rich sedimentary rock (Complex hydrocarbons)
sedimentary
Amethyst (Tumbled/Weathered Quartz)
Amethyst (SiO2 with iron impurities)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Ametrine
Ametrine (SiO2 - Silicon Dioxide with trace amounts of Iron)
mineral
Man-made Green Quartz (Lab-grown or Treated)
Silicon Dioxide (SiO2) with artificial coloration
mineral
Quartzite (Engineered Stone)
Silicon Dioxide (SiO2) based synthetic composite
metamorphic
Cubic Zirconia (Simulated Diamond)
Cubic Zirconia (ZrO2)
mineral
Chalcanthite
Copper(II) sulfate pentahydrate (CuSO4·5H2O)
mineral
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Diamond (or high-quality simulant like Cubic Zirconia)
Carbon (C) - Native Element
mineral
Ruby (set in a gold pendant)
Ruby (Variety of Corundum, Al2O3)
mineral
Crystal Quartz Beads (likely Clear Quartz)
Quartz (SiO₂)
Mineral
Build-A-Bear Plush (Non-Geological)
Polyester fibers (C10H8O4)n and Synthetic Polymers
Anthropogenic / Non-mineral
Likely diamond accent
Diamond (crystalline carbon, C)
gemstone
Dalmatian Stone
Dalmatian Stone (Felsic Igneous Rock)
igneous
Man-made Crystal (Lead Glass)
Lead oxide-doped Silica Glass (approx. SiO2 + PbO)
Mineraloid/Synthetic Material
White Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineraloid
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Corundum (variety Ruby/Sapphire)
Aluminum Oxide (Al2O3)
mineral
Pearl-embellished decorative cross
Pearl (biogenic calcium carbonate, predominantly aragonite) with rhinestone-mounted glass or synthetic gemstones
gemstone
Colorless faceted gemstone (most likely synthetic cubic zirconia)
Cubic zirconia, ZrO₂ (likely synthetic); natural alternatives include quartz or diamond
gemstone
Emerald
Beryl (Be3Al2(SiO3)6) with trace Chromium/Vanadium
mineral
Lapis Lazuli
Lapis lazuli (complex rock; primarily Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Amber
Succinite (specifically for Baltic amber; general formula C10H16O)
Mineraloid (Organic)
Carborundum (Silicon Carbide)
Silicon Carbide (SiC)
mineral
Blue Dyed Agate
Cryptocrystalline Quartz (SiO2)
mineral
Anthracite Coal
Anthracite (Carbon ≥ 86%)
sedimentary
Peridot gemstone pendant
Olivine, gem-quality forsteritic olivine (approximately (Mg,Fe)₂SiO₄)
gemstone
Diamond (Faceted)
Carbon (C)
gemstone
Iolite (Cordierite)
Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18
Mineral
Smoky Quartz (with Druzy/Polished Edge)
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Ruby
Corundum (Al2O3 with Chromium trace elements)
mineral
Sapphire (likely blue synthetic sapphire or blue glass in a ring)
Corundum (Al₂O₃), specifically the blue variety due to trace amounts of iron and titanium impurities. If synthetic, it would still be Al₂O₃.
Mineral
Diamond
Carbon (C)
mineral
Sapphire
Corundum (Al2O3)
mineral
Tumbled turquoise-like stone
Likely turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Emerald
Beryl (Be3Al2Si6O18), specifically the green variety colored by chromium or vanadium
Mineral (Gemstone variety of Beryl)