Blue Goldstone
Aventurine Glass
Man-made glass (often grouped with minerals in lapidary)
Category
Mineraloid Like Synthetic Material
Browse mineraloid like synthetic material specimens identified by the Rock Identifier community.
Learn about Mineraloid Like Synthetic Material in the encyclopedia
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Ruby
Corundum (Al2O3 with Chromium trace)
mineral
Common Opal with Host Rock
Opal (Hydrated silica, SiO2·nH2O)
mineral
Polished amber inclusion specimen
Amber (fossilized plant resin), commonly succinite; organic mineraloid
gemstone
Opalite
Synthetic Opalised Glass
glass
Opalite
Synthetic opalescent glass
glass
Tiger’s eye
Quartz (SiO₂), fibrous pseudomorph after crocidolite
gemstone
Likely colorless topaz
Topaz, Al₂SiO₄(F,OH)₂
mineral
Blue Sapphire
Corundum (Al2O3 with trace Titanium and Iron)
mineral
Ruby
Corundum (Al2O3 with Chromium)
mineral
Tektite (specifically Indochinite)
Tektite (Natural silica glass)
Mineraloid (Impact glass)
Polished tiger’s eye
Quartz (microcrystalline SiO₂) with crocidolite-derived iron oxides
mineral
Larimar
Pectolite (NaCa2Si3O8(OH))
Mineral variant / Gemstone
Amber (polished piece)
Fossilized tree resin; amber is an organic mineraloid, not a true mineral
gemstone
Blue Sapphire
Corundum (Al2O3 with Cr, Fe, and Ti trace elements)
gemstone
Turquoise cabochon pendant
Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Blue faceted gemstone ring, likely synthetic sapphire or blue topaz
Uncertain from image; possible corundum (Al₂O₃) or topaz (Al₂SiO₄(F,OH)₂)
gemstone
Faceted pale-green gemstone, likely prasiolite or green quartz
Quartz (SiO₂), likely prasiolite; identification is uncertain from the photograph
gemstone
Diamond (or Diamond Simulant)
Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia - ZrO2, Moissanite - SiC)
gemstone
Obsidian
Volcanic Glass
igneous
Obsidian
Volcanic glass
igneous
Obsidian
Volcanic Glass
igneous
Obsidian
Volcanic Glass
igneous
Emerald in Matrix
Beryl (Be3Al2Si6O18) with trace amounts of Chromium/Vanadium
mineral
Tumbled opalite (likely synthetic glass)
Opalite; typically man-made opalescent soda-lime glass, not a recognized mineral species
gemstone
Rainbow Hematite / Magnetic Hematite
Iron oxide (Fe2O3) - often synthetic/coated for beads
mineral
Small faceted gemstone, likely diamond
Diamond (crystalline carbon, C)
gemstone
Chrysocolla in Malachite
Cu2CO3(OH)2 (Malachite) / Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)
mineral
Blue goldstone (man-made glass)
Copper-bearing aventurine glass; synthetic silicate glass
mineral
Snowflake Obsidian
Volcanic Glass (spherulitic Obsidian) - SiO2 (with Cristobalite inclusions)
igneous
Cubic Zirconia (Jewelry Setting)
Cubic Zirconia (ZrO2)
gemstone
Iron Slag
Ferrous Slag (Industrial Byproduct)
mineraloid (anthropogenic byproduct)
Blue-green gemstone ring, likely treated turquoise or synthetic/treated beryl
Indeterminate from image; possibilities include turquoise (CuAl6(PO4)4(OH)8·4H2O), apatite, or treated beryl
gemstone
Lapis Lazuli
Lapis lazuli (Rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Ruby (Pink to Red Corundum)
Al2O3 (Corundum with Chromium impurities)
mineral
Faceted golden beryl (likely heliodor)
Beryl, Be₃Al₂Si₆O₁₈; yellow color from iron impurities
gemstone
Blue gemstone, likely iolite or blue sapphire
Iolite (cordierite, Mg₂Al₄Si₅O₁₈) or corundum (sapphire, Al₂O₃)
gemstone
Faceted colorless gemstone, likely quartz or glass imitation
Most plausibly rock crystal (quartz, SiO₂); identity is uncertain because the photograph shows only intense facet reflections
gemstone
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst cabochon
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
gemstone
Artificial Rock Face (Faux Rock)
Glass Fiber Reinforced Concrete (GFRC)
man-made/construction material