Man Made Glass

Diamond (or Simulant)

Carbon (C)

Opalite (likely imitation opal glass)

Man-made opalescent glass; not a natural mineral (often sold as opalite)

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial byproduct)

Silicon Carbide (Carborundum)

Silicon Carbide (SiC) / Moissanite (natural)

Blue opalite glass (likely man-made)

Opalite glass; a silica-based amorphous glass, not natural opal

Opalite

Synthetic Opalite Glass

Opalite crescent pendant

Opalite (man-made opalescent glass; not a natural mineral)

Opalite

Synthetic Opalised Glass

Sea Glass

Man-made vitreous material (silica-based glass)

Slag

Anthropogenic glassy silicate

Opalite

Synthetic Fluorescent Glass (SiO2 + impurities)

Pink Quartz / Sea Glass

Silicon Dioxide (SiO2)

Goldstone (Red)

Aventurine Glass (Cupriferous glass)

Sea Glass

Man-made silicate glass (Amorphous silicon dioxide)

Slag Glass

Vitreous Silicate Residue

White sea glass (naturally frosted glass fragment)

Man-made silicate glass, typically soda-lime glass; not a mineral or rock

Stainless Steel (Polished)

Ferrous Alloy containing Iron (Fe), Chromium (Cr), and Carbon (C)

Chert (Arrowheads)

Microcrystalline Quartz (SiO2)

Red Slag Glass

Amorphous Silica (Industrial byproduct with metallic oxide dopants)

Green Slag

Anthropogenic Silicate Glass

Obsidian (Blue)

Volcanic Glass (SiO2)

Opalite

Synthetic Opalised Glass

Green sea glass or tumbled green quartz (uncertain)

Likely quartz (SiO₂) if natural; alternatively man-made soda-lime glass

Opalite

Synthetic Opalized Glass

Exposed Aggregate Concrete (Pea Gravel)

Concrete with Siliceous Alluvial Gravels

Opalite (likely man-made opalescent glass)

Opalite; not a true mineral, typically synthetic opalescent glass (silica-based)

Blue Obsidian (Cullet Glass)

Silicon Dioxide (Amorphous Glass)

Green sea glass (likely bottle glass)

Man-made soda–lime silicate glass; not a natural mineral

Concrete Fragment

Hardened Portland cement and mineral aggregate

Opalite

Synthetic Glass (Simulated Moonstone/Opal)

Asphalt Concrete

Bituminous conglomerate

Slag (Industrial Byproduct)

Artificial silicate/iron byproduct

Green glass sphere/marble

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

Goldstone beads (likely brown goldstone)

Man-made copper-bearing glass; not a natural mineral. Often sold as “aventurine glass.”

Opalite

Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)

Transit Token (RTD Denver)

Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)

Blue Goldstone

Synthetic Avanturine Glass (or Aventurine Glass)

Cullet Glass (sometimes mistaken for Blue Obsidian or Slag)

Amorphous Silicon Dioxide (SiO2) with chemical additives (e.g., Cobalt for blue color)

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

Small greenish crystal/mineral fragment

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

Pyrite in Quartz (Drill Core)

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

Green sea glass (likely bottle glass)

Man-made soda-lime silicate glass; not a natural mineral