Opalite
Synthetic Glass (SiO2 + impurities)
mineral
Category
Tektite (Natural Glass)
Browse tektite (natural glass) specimens identified by the Rock Identifier community.
Learn about Tektite (Natural Glass) in the encyclopedia
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Libyan Desert Glass
Libyan Desert Glass (Impactite)
meteorite
Cullet Glass (Slag)
Amorphous Silicon Dioxide (Man-made)
Mineraloid
Colorless faceted gemstone, likely cubic zirconia
Cubic zirconia (synthetic ZrO₂), possibly glass or quartz
gemstone
Sandstone
Arenite
sedimentary
Obsidian
Volcanic Glass
igneous
Green Glass (often marketed as 'Obsidian' or 'Green Quartz')
Amorphous Silica (SiO2) with copper or chromium additives
Mineraloid (Man-made)
Dragon's Breath (Mexican Opal Glass)
Artisan Foil Glass (SiO2 based)
mineraloid
Chipped Glass/Plastic Fragment
Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic
Man-made material (simulant/artifact)
Blue Goldstone
Aventurine Glass (Silicon Dioxide with metal inclusions)
man-made glass mineral simulant
Sandstone (with vugs or solution cavities)
Arenite (primarily Quartz and Feldspar with CaCO3 or SiO2 cement)
sedimentary
Cubic Zirconia
Zirconium Dioxide (ZrO2)
mineral
Amethyst and Citrine (Ametrine Mix)
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Opalite
Synthetic Opalite Glass (Silicon Dioxide)
mineraloid (man-made)
Raw Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Ruby (Faceted)
Corundum (Al2O3:Cr)
gemstone
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Opalite
Man-made glass (traditionally simulated Opal)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Diamond (or Cubic Zirconia)
Carbon (C) / Cubic Zirconium Dioxide (ZrO2)
mineral
Prasiolite
Silicon Dioxide (SiO2) with iron impurities
mineral
Colorless faceted gemstone (likely cubic zirconia)
Cubic zirconia, zirconium dioxide (ZrO₂); possibly synthetic quartz or glass imitation
gemstone
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Snowflake Obsidian
Volcanic Glass with Cristobalite inclusions (SiO2)
igneous
Sandstone
Sandstone (SiO2-rich detrital sedimentary rock)
sedimentary
Quartz (Yellow / Citrine Pebble)
Silicon Dioxide (SiO2)
mineral
Opalite
Synthetic Opalised Glass
mineral
Blue Goldstone
Synthetic Avanturine Glass (or Aventurine Glass)
Synthetic Glass
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Cat's Eye Moonstone (Simulated/Synthetic or natural Cat's Eye Quartz/Glass)
There is no single scientific name. The appearance suggests either: Moonstone (feldspar group), Cat's Eye Quartz (SiO2), Apatite (Ca5(PO4)3(F,Cl,OH)), or most likely a synthetic material such as Fiber Optic Glass or 'Opalite' (a type of glass).
Mineral
Sandstone
Sandstone (Sedimentary rock composed of silicate grains)
sedimentary
Blue quartzite or blue aventurine glass-like aggregate
Quartzite, predominantly SiO₂ (identification uncertain from image)
metamorphic
Black Obsidian
Obsidian / Amorphous volcanic glass (SiO2)
igneous
Slag Glass
Silicon dioxide with impurities
mineral
Pink Quartz / Sea Glass
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Pink/red faceted gemstone, likely synthetic ruby or pink sapphire
Corundum, aluminum oxide (Al₂O₃); likely lab-grown or treated material
gemstone
Opalite Egg
Synthetic Glass (Simulated Opal)
mineral