Cullet (Slag Glass)
Amorphous Silica (SiO2) with various metal oxide colorants
mineraloid / anthropogenic
Category
Not A Natural Rock (Man Made Composite)
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Green Glass (often marketed as 'Obsidian' or 'Green Quartz')
Amorphous Silica (SiO2) with copper or chromium additives
Mineraloid (Man-made)
Aura Quartz (Titanium/Rainbow Quartz)
SiO2 (Silicon Dioxide) with metallic coating
mineral
Opalite
Synthetic Opalised Glass
mineral
Opalite
Synthetic Opalite Glass (Silicon Dioxide)
mineraloid (man-made)
Colorless faceted gemstone (most likely synthetic cubic zirconia)
Cubic zirconia, ZrO₂ (likely synthetic); natural alternatives include quartz or diamond
gemstone
Colorless faceted gemstone (likely cubic zirconia)
Cubic zirconia, zirconium dioxide (ZrO₂); possibly synthetic quartz or glass imitation
gemstone
Cullet Glass (Slag)
Amorphous Silicon Dioxide (Man-made)
Mineraloid
Obsidian (Blue)
Volcanic Glass (SiO2)
igneous
Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂), opaque-to-translucent milky variety
mineral
Diamond
Carbon (C)
gemstone
One Pound Coin (UK)
Nickel-Brass Alloy (Cu-Zn-Ni)
mineral
Dyed Agate
Chalcedony (SiO2)
mineral
Aura Quartz (Rainbow Quartz)
Silicon Dioxide (SiO2) with metallic vapor coatings
mineral
Aura Rose Quartz
SiO2 (Silicon Dioxide with Titanium/Gold coating)
mineral
Concrete Rubble with Aggregate
Hardened Portland Cement Paste with Coarse Aggregate
Anthropogenic (Man-made)
Opalite
Synthetic Glass (Simulated Opal)
mineral
Opalite
Synthetic Opalized Glass / Man-made Glass
gemstone
Beads (likely glass or man-made material)
N/A (artificial material)
Man-made material, not a natural rock or mineral specimen
Titanium Aura Quartz (Bismuth-coated Druzy)
Silicon Dioxide (SiO2) with Titanium/Metal vapor coating
mineral
Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral
Cubic Zirconia (Diamond Simulant)
Zirconium Dioxide (ZrO2)
gemstone
Opalite
Synthetic Glass / Man-made Opal Simulant
gemstone
Concretion (Sandstone)
Carbonate-cemented Sandstone Concretion
sedimentary
Engineered Quartz Stone
Agglomerated Quartz (SiO2 + Polymer Resin)
mineral-based composite
Opalite
Synthetic Glass, SiO2 base with metallic inclusions
mineraloid (synthetic)
Iron-rich vesicular rock, possibly slag or basalt
Uncertain; likely basaltic rock (plagioclase–pyroxene–iron oxide) or industrial iron slag
igneous
Aventurine Quartz
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite or Goethite inclusions
mineral
Jasper and Chalcedony Nodule
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Concrete rubble
Anthropogenic conglomerate
sedimentary
Opalite
Synthetic opalescent glass
glass
Aqua Aura Quartz
Silicon Dioxide (SiO2) bonded with Gold (Au)
mineral (treated)
Asphalt Concrete
Bituminous Concrete (Anthropic Rock)
sedimentary
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (Industrial byproduct)
mineraloid
Silicon Carbide (Carborundum)
Silicon Carbide (SiC)
mineral
Opalite
Synthetic Glass (typically Silica/Magnesium based with metal additives)
mineral
Zinc Alloy (Silver-plated)
Zinc Alloy Casting (Zn-Al-Mg-Cu)
mineral (refined metal)
Opalite
Man-made glass (traditionally simulated Opal)
mineral
Opalite (Synthetic Moonstone/Sea Opal)
Silicon Dioxide (SiO2) glass with metallic inclusions
Synthetic/Man-made Glass
White quartz pebble
Quartz (SiO₂), likely milky quartz
mineral
Opalite (a synthetic glass, often confused with Opal)
Silicon dioxide glass (SiO2nH2O, for natural opal)
Synthetic (glass)