Carborundum (Silicon Carbide)
Silicon Carbide (SiC)
mineral
Category
Mineral Simulant (Synthetic Glass)
Browse mineral simulant (synthetic glass) specimens identified by the Rock Identifier community.
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Cubic Zirconia (Simulated Diamond)
Zirconium dioxide (ZrO2)
mineral
Diamond ring
Diamond (crystalline carbon, C)
gemstone
Terrazzo (Synthetic Composite Rock)
Cementitious or Epoxy Resin-bound Aggregates
Man-made metamorphic-style composite
Hematite
Iron(III) oxide, Fe2O3
mineral
Dalmatian jasper
Orbicular rhyolite, commonly sold as Dalmatian jasper; quartz- and feldspar-rich volcanic rock with dark amphibole/biotite inclusions
igneous
Diamond (in Jewelry)
Diamond (Carbon, C)
mineral
Blue-beaded gemstone jewelry, likely lapis lazuli or dyed blue agate
Uncertain from the image; possible lazurite-bearing lapis lazuli (Na₃Ca(Si₃Al₃)O₁₂S) or blue chalcedony (SiO₂)
gemstone
Black faceted gemstone, possibly black spinel or synthetic material
Undetermined from image; candidates include spinel (MgAl₂O₄) or black sapphire (corundum, Al₂O₃)
gemstone
Bismuth Crystal
Bismuth (element symbol Bi, atomic number 83)
mineral
Tumbled hematite
Hematite (iron(III) oxide, Fe₂O₃)
mineral
Tumbled hematite
Hematite (Fe₂O₃), commonly sold as “magnetic hematite” when synthetic or magnetized
mineral
Blue Sapphire (in a faceted jewelry setting)
Corundum (Al2O3) with trace Iron and Titanium
mineral
Ruby
Corundum (Al2O3)
mineral
Ruby
Corundum (Al2O3 with Chromium)
mineral
Emerald
Beryl, Be₃Al₂(SiO₃)₆, colored green mainly by chromium and/or vanadium
gemstone
Faceted golden beryl (likely heliodor)
Beryl, Be₃Al₂Si₆O₁₈; yellow color from iron impurities
gemstone
Emerald in Matrix
Beryl (Be3Al2Si6O18) with trace amounts of Chromium/Vanadium
mineral
Cubic Zirconia and Synthetic Ruby Jewelry
Cubic Zirconia (ZrO2) and Synthetic Corundum (Al2O3)
gemstone
Emerald
Beryl (Be3Al2(SiO3)6) colored by Chromium and/or Vanadium
mineral
Synthetic Marbled Aggregate (Footwear Component)
Ethylene-vinyl acetate (Croslite™)
not a rock (man-made polymer)
Diamond (Faceted Gemstone)
Native Carbon (C)
mineral
Opal ring
Common opal, likely synthetic or assembled blue-green opal (hydrated amorphous silica, SiO₂·nH₂O)
gemstone
Ruby (Pink to Red Corundum)
Al2O3 (Corundum with Chromium impurities)
mineral
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Polished amethyst cabochon
Amethyst, purple quartz (SiO₂)
gemstone
Bouncy Ball (Synthetic Rubber Polymer)
Polybutadiene / Ethylene Vinyl Acetate (EVA)
Synthetic material (Not a rock or mineral)
Serpentine (Serpentinite)
Serpentinite rock / Serpentine subgroup ((Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Black onyx or black spinel ring stone
Likely chalcedony (SiO₂), variety black onyx; possibly synthetic spinel or glass
gemstone
Anthropogenic Heat Source (Electronic/Industrial Interface)
Thermal IR emission (Electronic infrastructure)
not a rock or mineral
Sapphire
Corundum (Al2O3)
gemstone
Amethyst (Resin Carving/Orgonite)
Silicon Dioxide (SiO2) with iron impurities
mineral
Cubic Zirconia (Man-made)
Cubic Zirconia (ZrO2) with Enamel and Metal Alloy
mineral
Man-made Ceramic / Clay Figurine
Aluminosilicate Ceramic (Processed Clay)
Synthetic (not a rock or mineral)
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Emerald
Beryl (Be₃Al₂Si₆O₁₈), colored green by chromium and/or vanadium
gemstone
Amber (and Cubic Zirconia)
Fossilized Tree Resin
mineraloid
Tumbled blue glass-like specimen, possibly dyed chalcedony or synthetic glass
Uncertain; possible dyed quartz/chalcedony (SiO₂), but appearance strongly suggests cobalt-blue glass
mineral
Icy Jadeite (Jade Bangle)
Jadeite, NaAlSi2O6 (Pyroxene group)
gemstone
Likely rough amber
Amber (fossilized tree resin; composition varies, commonly dominated by polymerized terpenoids)
gemstone
Diamond
Carbon (C), Native Element
mineral
Blue-green turquoise (probable)
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral