Mineral (Man Made Glass, Not Natural)

Green Sea Glass

Man-made silicate glass (weathered)

Man-made Slag (Industrial Byproduct)

Anthropogenic Glassy Residue

White quartz pebble or chip

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Unidentified translucent crystal/mineral fragment

Likely quartz (SiO₂), but visual identification is uncertain

Tumbled clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Slag Glass (Cullet)

Amorphous Silica (man-made), primarily SiO2 with trace metal oxides

Crackle Glass (Simulated Gemstone)

Amorphous Solid (SiO2)

Blue Goldstone

Auraventurine (Synthetic glass with cobalt and copper inclusions)

Porcelain Tile (Sandstone-look)

Man-made Ceramic (resembling Quartz-rich Sandstone)

Libyan Desert Glass

Tektite (high-silica impact glass), SiO2

Sea Glass

Man-made vitreous material (silica-based glass)

Dyed Crackle Quartz

Silicon Dioxide (SiO2) with synthetic dye

Terrazzo (Man-made Composite)

Cementitious or Resin-bound Lithic Composite

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Moldavite

Tektite (Impact Glass), ~80% SiO2 + Al2O3

Man-made Dyed Aura Quartz

Silicon Dioxide (SiO2) with metallic coating/dye

Clear quartz sphere

Quartz (silicon dioxide, SiO₂)

Goldstone

N/A (Synthetic Glass with Copper Inclusions)

Tumbled gray stone, likely quartz-rich pebble

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

Goldstone (aventurine glass)

Synthetic copper-bearing soda-lime glass; commonly sold as red goldstone

Crescent Pebble

Weathered Quartzite or Sandstone Fragment

Sea Glass

Man-made silicate glass (Amorphous silicon dioxide)

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Concrete Fragment

Hardened Portland cement and mineral aggregate

Pyrite in Quartz (Drill Core)

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions

Rounded graywacke or sandstone cobble

Lithified clastic sandstone; likely quartz–feldspar–lithic grain aggregate in a silica or calcite matrix

Small greenish crystal/mineral fragment

Indeterminate; possibly olivine, quartz, or a green gemstone fragment

Clear quartz fragment (rock crystal)

Quartz, silicon dioxide (SiO₂)

Red glassy cabochon, likely synthetic ruby or red glass

Uncertain; possible synthetic corundum (Al₂O₃, chromium-colored) or man-made glass

Sea Glass

Man-made silicate glass (Amorphous silicon dioxide)

Slag

Anthropogenic glassy silicate

Sea Glass

Amorphous silicon dioxide (Man-made glass weathered by nature)

Rock crystal (clear quartz), possibly cloudy quartz

Quartz, silicon dioxide (SiO₂)

Blue glass-like bead or gemstone keychain ornament

Indeterminate; likely cobalt-blue glass or synthetic blue spinel, not identifiable as a natural mineral from the image

Polished labradorite sphere

Labradorite, calcic plagioclase feldspar ((Ca,Na)(Al,Si)₄O₈)

Sea Glass

Man-made silicate glass weathering product

Blue Goldstone

Synthetic glass with cobalt and copper inclusions

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2

Milky quartz (likely quartz crystal fragment)

Quartz, silicon dioxide (SiO₂)

Pet Rock (Man-made Quartzite or Granite Cobble)

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

Sandstone Concretion

Limonitic Sandstone Concretion

Polished labradorite pendant

Labradorite, a calcium-rich plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈)