Not A Natural Rock (Man Made Composite)

Goldstone (brown goldstone)

Man-made aventurine glass, typically copper-bearing silica glass

Asphalt Chunk

Asphalt concrete

Green sea glass (likely slag glass or bottle glass)

Man-made soda-lime silicate glass; not a naturally occurring mineral

Painted River Rock

Artificially Coated Sedimentary Rock

Opalite (Man-made Glass)

Fused glass (typically made of dolomite and metal opacifiers)

Not a geological specimen

N/A (man-made object)

Crescent Pebble

Weathered Quartzite or Sandstone Fragment

Sandstone (with Liesegang rings or joints)

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)

Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)

Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)

Opalite

Synthetic Opalite Glass

Opalite

Synthetic glass / Opaque silicious glass

Green glass sphere/marble

Soda-lime glass (primarily SiO2, Na2O, CaO)

Granite with Cupules / Bedrock Mortars

Granite (felsic intrusive plutonic rock)

Mystic Topaz (Treated Quartz or Topaz)

Aluminum silicate fluoride hydroxide [Al2SiO4(F,OH)2] with thin-film metallic coating

Sea Glass

Man-made silicate glass

Green glass-like cabochon, likely synthetic glass or resin

Unidentified green transparent material; possibly molded glass, synthetic spinel, or resin

Aura Quartz (Titanium Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti)

Titanium Aura Quartz

Titanium bonded Silicon Dioxide (SiO2 + Ti)

Cobalt Blue Glass / Cullet Glass

Silicon dioxide (Amorphous man-made glass)

Aura Quartz (Titanium-coated Quartz)

Silicon Dioxide (SiO2) with metallic vapor coating

Slag

Metallurgical Slag

Goldstone

Aventurine Glass (Man-made)

Diamond (or Simulant)

Carbon (C)

Pet Rock (Man-made Quartzite or Granite Cobble)

Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica

Blue Obsidian (Cullet Glass)

Silicon Dioxide (Amorphous Glass)

Asphalt aggregate (crushed stone in bitumen)

Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen

Polished black pebble, likely basalt

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, commonly with olivine

Sandstone Anvil / Nutting Stone

Quartzose Sandstone (Sedimentary Rock)

Opalite

Synthetic Glass (Hydrated Silica Simulant)

Costume Jewelry with Synthetic Gemstones

Synthetic Cubic Zirconia and Glass (SiO2 / ZrO2)

Clear quartz tumbled stone

Quartz (silicon dioxide, SiO₂)

Polymer Clay (Mock Mineral)

Polyvinyl chloride (PVC) with plasticizers and pigment

Ring with an Orange Inlay

N/A (Man-made object)

Opalite

Synthetic Glass (SiO2 + impurities)

Polymictic conglomerate or breccia (possibly concrete-like aggregate)

Lithified polymictic gravel; clasts may include basalt, granite, quartzite, and other silicates

Opalite

Synthetic Glass (Amorphized Silicon Dioxide)

Opalite

Synthetic Opalized Glass (SiO2 + additives)

Opalite

Synthetic Glass (Simulated Opal)

Aura Quartz

Titanium or Gold bonded Silicon Dioxide (SiO2)

Aura Quartz (specifically Titanium Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti Coating)

Dyed Imperial Jasper (Sea Sediment Jasper)

Silicon Dioxide (SiO2) - Impure Quartz/Chalcedony

Decorated turquoise-like bead or mineral pendant

Likely turquoise [CuAl₆(PO₄)₄(OH)₈·4H₂O], possibly dyed composite or blue-green jasper