Antropogenic (Man Made Material)

Porcelain (White Ceramic)

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

Tumbled milky quartz

Quartz (SiO₂), cryptocrystalline-to-massive variety

Slag

Metallurgical by-product

Blue opalite glass cabochon (likely imitation opal)

Man-made opalescent glass; not a natural mineral

Mohave Turquoise (Composite/Stabilized)

Hydrated copper aluminium phosphate (CuAl6(PO4)4(OH)8·4H2O) with stabilizing resin and metallic inclusions

Opalite

Man-made glass (traditionally simulated Opal)

Painted River Rock

Artificially Coated Sedimentary Rock

Stainless Steel (Polished)

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

Asphalt Concrete (Bituminous Concrete)

Bituminous aggregate

Opalite (Synthetic Moonstone/Sea Opal)

Silicon Dioxide (SiO2) glass with metallic inclusions

Opalite

Synthetic glass (SiO2 + impurities)

Asphalt (Bituminous pavement)

Bituminous concrete / Asphalt

Slag (Industrial Glass/Glassy Rock)

Anthropogenic Vitreous Material

Diamond

Native Carbon (C)

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) with polymer resins

Blue cabochon gemstone, likely synthetic glass or dyed stone

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

Blue glassy gemstone-like specimen

Indeterminate; possibly dyed or treated turquoise, blue apatite, or man-made glass

Red Sandstone or Brick Fragment

Arenite (if sandstone)

Goldstone

Avventurina (Man-made Glass with Copper inclusions)

Polished black pebble, likely basalt

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

Opalite (a synthetic glass)

Silicon Dioxide (SiO2) with various additives; not a true mineral but a man-made gem simulant

Not a rock, mineral, or geological specimen

Opalite

Synthetic glass / Opaque silicious glass

Transit Token (RTD Denver)

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

Blue Goldstone

Aventurine Glass

Conglomerate

Conglomerate (Sedimentary rock containing rounded clasts)

Polished opalite (likely man-made opalescent glass)

Opalite is a commercial name, not a mineral; typically opalescent glass, often soda-lime silicate glass

Glass

Amorphous Silicon Dioxide (SiO2)

Opalite

Man-made opalescent glass

Opalite

Man-made opalized glass

Sea Glass

Man-made silicate glass

Slag Glass

Amorphous Silicate (Man-made)

Sea Glass

Man-made silicate glass

Red glassy gemstone, possibly garnet

Unidentified red transparent material; garnet group (X₃Y₂(SiO₄)₃) is a possibility

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

Asphalt (Bituminous Pavement)

Bituminous mix (Aggregates with Bitumen binder)

Tumbled gray stone, likely quartz-rich pebble

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

Note: This is a Man-Made Object (Costume/Prop Patch)

Synthetic fiber and pigments (Cellulose/Plastic-based composite)

Aura Quartz (Rainbow Quartz)

Silicon Dioxide (SiO2) with metallic vapor coatings

Sea Glass

Man-made vitreous material (silica-based glass)

Small pebble, likely limestone

Unidentified carbonate pebble, possibly micritic limestone (calcite, CaCO₃)

Carborundum (Silicon Carbide)

Silicon Carbide (SiC)