Man Made Material (Simulated Mineral)

Citrine Quartz

Citrine (Silicon Dioxide, SiO2)

Transit Token (RTD Denver)

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

Opalite

Synthetic glass / Opaque silicious glass

Red goldstone beads

Goldstone (man-made copper-bearing glass; not a natural mineral)

Crushed Stone (Likely Limestone or Granite)

Calcium Carbonate (CaCO3) for Limestone / Quartz and Feldspar for Granite

Painted River Rock

Artificially Coated Sedimentary Rock

Small greenish crystal/mineral fragment

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

Opalite

Synthetic glass / Opalized glass

Man-made Synthetic Material (Plastic/Composite)

Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)

Conglomerate

Conglomerate (clastic sedimentary rock)

Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Tumbled opalite (likely man-made glass)

Opalite glass; a synthetic opalescent glass, not a natural mineral species

Concrete rubble

Anthropogenic conglomerate

Mystic Topaz (Treated Quartz or Topaz)

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

Opalite

Man-made opalescent glass

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial byproduct)

Iron Slag (Industrial Byproduct)

Anthropogenic Vitrification Product/Ferrous Slag

Likely blue-green glassy slag or a weathered mineral fragment

Unidentified; the image does not show diagnostic features sufficient for a mineral identification

Polished brown jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions

Porcelain (White Ceramic)

Mullite-bearing Vitrified Ceramic (Major phases: Mullite Al6Si2O13, Glassy Silica SiO2)

Blue cabochon, likely dyed or synthetic material

Undetermined; possibly dyed chalcedony (SiO₂), glass, or synthetic corundum

Green Obsidian Sphere (man-made glass)

Vitreous Silica with Chromium/Iron additives

Opalite (Synthetic Opalized Glass)

Synthetic Silicon Dioxide (SiO2) glass

Carborundum (Silicon Carbide)

Silicon carbide (SiC)

Opalite

Synthetic Opalite (Man-made glass)

Goldstone

Man-made glass with copper inclusions

Black glassy fragment, likely obsidian or industrial glass

Volcanic glass (obsidian), chiefly amorphous SiO₂; identification uncertain from image

Bouncy Ball (Synthetic Rubber Polymer)

Polybutadiene / Ethylene Vinyl Acetate (EVA)

Asphalt (Bituminous pavement)

Bituminous concrete / Asphalt

Obsidian (likely black volcanic glass)

Obsidian; primarily amorphous volcanic silica glass, approximately SiO₂-rich rhyolitic composition

Green sea glass (likely)

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

Diamond

Native Carbon (C)

Decorative mosaic cross containing mixed rock and glass fragments

Polychrome aggregate; likely quartz, feldspar, marble, granite, and assorted colored glass

Tumbled milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) with polymer resins

Polished black pebble, possibly obsidian

Volcanic glass (obsidian), likely; identification is tentative from the image

Blue cabochon gemstone, likely synthetic glass or dyed stone

Indeterminate from image; possible glass, synthetic spinel, sodalite, or lapis lazuli

Red Sandstone or Brick Fragment

Arenite (if sandstone)

Sea Glass

Man-made silicate glass

Sea Glass

Man-made silicate glass

Sea Glass

Man-made silicate glass

Sea Glass

Man-made silicate glass