Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Category
Mineraloid Like Synthetic Material
Browse mineraloid like synthetic material specimens identified by the Rock Identifier community.
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Diamond (or high-quality simulant like Cubic Zirconia)
Carbon (C) - Native Element
mineral
Obsidian
Obsidian (Volcanic Glass)
igneous
Garden Quartz (Lodalite)
Silicon Dioxide with various mineral inclusions (SiO2)
mineral
Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)
Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)
Synthetic (Ceramic)
Green beryl gemstone (likely emerald or green beryl)
Beryl, Be₃Al₂Si₆O₁₈; green color from chromium/vanadium or iron
gemstone
Diamond ring
Diamond, crystalline carbon (C), set in a gold-colored metal ring
gemstone
Turquoise
Hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Bismuth
Bismuth (Bi)
mineral
Silicon
Element Si
mineral
Diamond jewelry pendant or cluster
Diamond, crystalline carbon (C), likely mounted in metal
gemstone
Diamond (in jewelry)
Cubic Carbon (C)
mineral
K2 Stone (or K2 Jasper)
Azurite-in-Granite (Potassium Feldspar, Quartz, Plagioclase, Muscovite, and Azurite)
igneous
Diamond (or Cubic Zirconia simulant)
Carbon (C) - Diamond / Zirconium dioxide (ZrO2) - CZ
mineral
Peridot gemstone pendant
Olivine, gem-quality forsteritic olivine (approximately (Mg,Fe)₂SiO₄)
gemstone
Tanzanite earrings
Tanzanite, blue-violet zoisite (Ca₂Al₃(SiO₄)₃(OH))
gemstone
Blue Goldstone
Aventurine Glass
man-made glass
Blue-and-white opalite sphere
Opalite (commercial synthetic or glass-based imitation; not true opal), typically silica glass or synthetic opalescent material
mineral
Opalite (Man-made Glass)
Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)
Synthetic Mineral Simulant / Glass
Red Sandstone
Clastic Sedimentary Mineraloid (predominantly Quartz grains with Iron Oxide cement)
sedimentary
Blue Sapphire
Corundum (Al2O3)
gemstone
Faceted red gemstone, likely ruby
Corundum (Al₂O₃), red variety colored mainly by chromium
gemstone
Ruby
Corundum (Al2O3 with Chromium impurities)
mineral
Amethyst jewelry centerpiece
Amethyst, purple quartz (SiO₂), likely set with colorless diamonds or other gems
gemstone
Malachite
Cu2CO3(OH)2 (Copper Hydroxide Carbonate)
mineral
Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
mineral
Tumbled amethyst
Amethyst, purple quartz (SiO₂)
gemstone
Golden Sheen Obsidian
Volcanic Glass (predominantly SiO2, >70%)
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Ruby (in jewelry)
Corundum (Al2O3 with Chromium traces)
mineral
Opalite
Synthetic Opalised Glass
Mineral (Synthetic / Man-made)
Opalite
Synthetic Opalised Glass
mineral
Blue Obsidian
Volcanic Glass (Amorphous)
gemstone
Obsidian
Volcanic Glass (comprised primarily of SiO2)
Igneous
Obsidian
Volcanic Glass
igneous
Aquamarine in Onyx / Blue Topaz Pendant
Beryl (Be₃Al₂Si₆O₁₈) or Topaz (Al₂SiO₄(F,OH)₂)
gemstone
Opalite
Man-made Opalized Glass (Synthetic Glass)
gemstone
Colorless faceted gemstone, likely cubic zirconia
Cubic zirconia (zirconium dioxide, ZrO₂); visual confirmation is unavailable
gemstone
Ruby
Corundum (Al2O3 with Chromium trace impurities)
mineral
Colorless faceted gemstone, likely cubic zirconia
Cubic zirconia (synthetic zirconium dioxide, ZrO₂); possibly colorless quartz or laboratory diamond
gemstone
Mahogany Obsidian
Volcanic Glass (SiO2 with Fe/Mg oxides)
igneous
Polished turquoise cabochon pendant
Turquoise, hydrated copper-aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; likely stabilized or matrix-bearing material
mineral