Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities and natural radiation
mineral
Category
Mineraloid (Synthetic)
Browse mineraloid (synthetic) specimens identified by the Rock Identifier community.
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Tourmalinated Quartz
Crystalline Silicon Dioxide with Schorl inclusions (SiO2 + NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Ruby (set in a gold pendant)
Ruby (Variety of Corundum, Al2O3)
mineral
Dalmatian Stone
Dalmatian Stone (Felsic Igneous Rock)
igneous
Sapphire (Blue)
Corundum (Al2O3)
mineral
White Sapphire
Corundum (Al2O3)
mineral
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Diamond (or high-quality simulant like Cubic Zirconia)
Carbon (C) - Native Element
mineral
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Corundum (variety Ruby/Sapphire)
Aluminum Oxide (Al2O3)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Opalite
Synthetic Glass / Man-made Opal Simulant
gemstone
Blue Goldstone
Synthetic glass with copper or cobalt/manganese inclusions
man-made glass
Quartzite (Engineered Stone)
Silicon Dioxide (SiO2) based synthetic composite
metamorphic
Goldstone (with Tiger's Eye and Quartz)
Aventurine glass (Synthetic SiO2 with Cu inclusions)
mineral
Blue Goldstone
Auraventurine (Synthetic glass with cobalt and copper inclusions)
Synthetic (Man-made Glass)
Black Opal (Triplet)
Hydrated Silica (SiO2·nH2O)
mineral
Man-made Jewelry (Metal and Glass/Plastic)
Synthetic Alloy and Amorphous Solid (SiO2/Polymer)
not a rock
Build-A-Bear Plush (Non-Geological)
Polyester fibers (C10H8O4)n and Synthetic Polymers
Anthropogenic / Non-mineral
Limonite (Yellow Ochre)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
mineral
Snowflake Obsidian
Volcanic Glass (spherulitic Obsidian) - SiO2 (with Cristobalite inclusions)
igneous
Obsidian
Volcanic glass (silica-rich rhyolitic melt; primarily SiO₂)
igneous
Obsidian
Obsidian (Extrusive Volcanic Glass)
igneous
Obsidian
Volcanic Glass (comprised primarily of SiO2)
Igneous
Black Obsidian
Volcanic Glass (predominantly SiO2, Silicon Dioxide)
igneous
Mahogany Obsidian
Volcanic glass (SiO2 + Fe2O3)
igneous
Emerald
Beryl (Be3Al2(SiO3)6) with trace Chromium/Vanadium
mineral
Blue Goldstone
Aventurine Glass
man-made glass
Opalite
Man-made opalescent glass (SiO2 + metal oxides)
mineral (synthetic)
Green cabochon gemstone pendant, likely turquoise or dyed green turquoise
Probably turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; exact identification requires testing
gemstone
Pearls (likely freshwater cultured pearls)
Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin
gemstone
Lapis Lazuli
Lapis lazuli (complex rock; primarily Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Carborundum (Silicon Carbide)
Silicon Carbide (SiC)
mineral
Blue Dyed Agate
Cryptocrystalline Quartz (SiO2)
mineral
Diamond (Faceted)
Carbon (C)
gemstone
Anthracite Coal
Anthracite (Carbon ≥ 86%)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic glass (Amorphous silicon dioxide)
igneous
Obsidian
Volcanic glass
igneous
Mahogany Obsidian
Volcanic Glass (SiO2 with Fe/Mg oxides)
igneous