Anthropogenic (Man Made Product Subject To Geological Processes)

Quartz

Silicon dioxide (SiO₂)

Blue Goldstone

Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)

Blue Goldstone

Aventurine Glass (SiO2 with Cobalt/Copper inclusions)

Glass Nugget (Tumbled Glass)

Amorphous Silicon Dioxide (SiO2) with additives

Quartz

Quartz (SiO2)

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various additives

Slag

Ferrous Slag (Siliceous industrial waste)

Sea Glass (Uranium/Vaseline Glass variant)

Silicon Dioxide (SiO2) with trace Uranium Oxide (U3O8)

Granite (weathered pebble)

Granite (plutonic igneous rock)

Sea Glass (Teal/Turquoise)

Amorphous Silica (SiO2) with trace metal oxides

Quartz (Milky Quartz)

Quartz (SiO2 - Silicon Dioxide)

Obsidian

Obsidian (volcanic glass, amorphous silica rich rock)

Serpentinite

Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)

Granite Cobble/Pebble

Granite

Green Slag Glass

Cullet (Amorphous Silicon Dioxide with impurities)

River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)

Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)

Marble

Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)

Polymictic breccia, possibly volcanic breccia

Polymictic clastic breccia; likely a matrix-supported breccia containing lithic fragments, quartz, feldspar, and dark mafic minerals

Carved quartz (likely rose quartz and green aventurine/quartz)

Quartz, silicon dioxide (SiO₂); green material may be aventurine quartz or serpentine

Green glassy mineral specimen, likely rough emerald or green fluorite

Tentatively beryl (Be₃Al₂Si₆O₁₈), emerald variety; synthetic/man-made glass cannot be excluded from the photograph

Crushed Limestone

Calcium Carbonate (CaCO3)

United States Quarter Dollar

Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)

Ferrochrome Slag

Industrial Glassy Slag (Fe-Cr alloy byproduct)

Synthetic Costume Glove (Paws)

Polyethylene terephthalate (Polyester) & Polyurethane blend

Porcelain (Kaolin-based)

Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)

Quartz

Silicon Dioxide (SiO₂)

Laterite

Laterite (primarily composed of hydrated oxides of iron and aluminum)

Quartz (Pebble)

Quartz (SiO₂)

Sulfur on Aragonite

Sulfur (S) and Aragonite (CaCO3)

Iron Slag

Vitreous glassy waste (Fe-Si-Al-Ca compounds)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Quartz (likely tumbled or naturally water-worn)

Quartz (SiO₂ - Silicon Dioxide)

Quartz (Engineered Quartz Surface)

Silicon Dioxide (SiO2) based composite

Probable amber fragment

Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)

Mother of Pearl (Nacre)

Calcium Carbonate (primarily aragonite, with conchiolin)

Marble

Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)

Goldstone (Synthetic Aventurescence Glass)

Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)

Epidote (or Epidote-rich rock)

Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).

Synthetic Marbled Aggregate (Footwear Component)

Ethylene-vinyl acetate (Croslite™)

Cullet Glass (Strawberry Glass)

Amorphous Silicon Dioxide (SiO2) with metallic dopants

Artificial Rock Face (Faux Rock)

Glass Fiber Reinforced Concrete (GFRC)

Green Aura Quartz (Titanium treated Kyanite or Quartz)

Silicon Dioxide (SiO2) or Aluminum Silicate (Al2SiO5) with Titanium/Metal Oxide coating