Anthropogenic Material (Man Made Rock)

Dyed or synthetic turquoise-blue glass-like specimen

Likely man-made colored glass or resin; exact identification requires testing

Glass

Amorphous Silicon Dioxide (SiO2)

Opalite

Man-made opalescent glass

Opalite

Man-made opalized glass

Sea Glass

Man-made silicate glass

Slag Glass

Amorphous Silicate (Man-made)

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

Slag (Anthropogenic Glass/Iron byproduct)

Ferro-silicate Slag

Goldstone (aventurine glass)

Man-made copper-bearing glass; not a natural mineral (commonly sold as blue/brown goldstone)

Opalite (Man-made Glass)

Fused glass (typically made of dolomite and metal opacifiers)

Crescent Pebble

Weathered Quartzite or Sandstone Fragment

Synthetic Costume Accessory (Non-Geological)

Polyester and Acrylic Fiber (Anthropogenic polymer)

Tumbled gray stone, likely quartz-rich pebble

Probable microcrystalline quartz/chalcedony (SiO₂), possibly gray jasper or quartzite

Aura Quartz (Rainbow Quartz)

Silicon Dioxide (SiO2) with metallic vapor coatings

Small pebble, likely limestone

Unidentified carbonate pebble, possibly micritic limestone (calcite, CaCO₃)

Blue glassy gemstone cabochon, likely dyed chalcedony or glass

Uncertain; possible dyed chalcedony (microcrystalline quartz, SiO₂)

Asphalt (Bituminous Pavement Bit)

Bitumen-bound aggregate (Petrochemical-bound composite)

Goldstone (likely red/brown aventurine glass)

Man-made aventurine glass; copper-bearing silicate glass (not a natural mineral)

Blue-green cabochon, likely chalcedony or treated glass imitation

Cryptocrystalline quartz (chalcedony/possibly chrysoprase); identification uncertain from image

Chakra Stone (Composite / Man-made Bonded Gemstones)

Composite of Quartz, Lapis Lazuli, Aventurine, Tiger's Eye, and Jasper (SiO2, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, etc.)

Man-made Synthetic Material (Not a rock or mineral)

Polyester (Polyethylene terephthalate) / Faux Fur

Opalite

Synthetic Glass (Hydrated Silica Simulant)

Granite with Cupules / Bedrock Mortars

Granite (felsic intrusive plutonic rock)

Likely clear quartz pebble or glassy quartz fragment

Quartz (silicon dioxide, SiO₂)

Strawberry Quartz

Silicon Dioxide (SiO2) with Hematite or Goethite inclusions

Hematite

Iron(III) oxide (Fe2O3)

Dyed Agate / Painted Stone

Silicon Dioxide (SiO2) with artificial pigment

Mother of Pearl (Nacre)

Aragonite (CaCO3) with Organic Matrix

Ferrous Slag

Iron/Steel Slag (Complex Calcium-Alumino-Silicates)

Clear quartz fragment

Quartz (silicon dioxide, SiO₂)

Diamond (or Simulant)

Carbon (C)

Sandstone Concretion

Septarian or Carbonate-cemented Sandstone Concretion

Boxwork or Septarian Concretion

Septarian nodule / Boxwork weathering

Goldstone (Brown/Gold)

Aventurine Glass (Man-made glass with Copper inclusions)

Opalite

Synthetic Opalised Glass

Fossiliferous limestone with colonial coral

Calcite (CaCO₃) limestone containing fossil tabulate or rugose coral colonies

Synthetic Resin / Plastic Figurine

Synthetic Polymer (Copolymer of Polyethylene or Resin)

Cultured Marble (Synthetic)

Polymer-matrix composite (typically calcium carbonate in polyester resin)

Slag (Industrial Glass)

Anthropogenic Amorphous Vitreous Silicate

Sea Glass

Silicon dioxide (mostly)

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

Goldstone (with Tiger's Eye and Quartz)

Aventurine glass (Synthetic SiO2 with Cu inclusions)