Man Made Material, Not A Natural Rock Or Mineral Specimen

Sandstone (with concrete/human-made layer)

Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)

Crescent Pebble

Weathered Quartzite or Sandstone Fragment

Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Opalite

Man-made opalized glass

Green sea glass (likely)

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

Green sea glass (likely slag glass or bottle glass)

Man-made soda-lime silicate glass; not a naturally occurring mineral

Brick fragment (Man-made material)

N/A (Fired clay)

Green sea glass (likely bottle glass)

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

Smelter Slag

Anthropogenic Silicate Slag

Lava Rock with Fabric Impression

Scoria or Basalt with anthropogenic impressions

Gold ring with a dark, possibly gemstone setting

Gold alloy; the dark setting is not identifiable from the image

Asphalt / Road Aggregate

Bituminous Conglomerate (synthetic)

Opalite

Synthetic Opalite Glass / Opalized Glass

Sandstone-based Concrete Fragment

Cementitious Composite with Sedimentary Aggregate

Cubic Zirconia (Jewelry Setting)

Zirconium Dioxide (ZrO2)

Goldstone (likely red/brown aventurine glass)

Man-made aventurine glass; copper-bearing silicate glass (not a natural mineral)

Blue Obsidian

Volcanic Glass (SiO2 with inclusions)

Diamond / Clear Quartz / Glass paste

Carbon (Diamond) / Silicon Dioxide (Quartz)

Blue obsidian-like volcanic glass

Volcanic glass, chiefly silica-rich amorphous material (composition uncertain)

Small gold-colored jewelry piece with clear stones

Likely a metal setting holding small faceted gemstones; the stones cannot be identified from the image.

Mohave Turquoise (Composite/Stabilized)

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

Blue sea glass or blue glassy mineral fragment

Uncertain; likely man-made soda-lime glass, not a natural mineral

Faceted glass-like gemstone (likely synthetic quartz or cubic zirconia)

Identification uncertain; possibilities include synthetic quartz (SiO₂) or cubic zirconia (ZrO₂)

Rainbow Hematite Ring

Iron(III) oxide (Fe2O3) with thin-film coating

Opalite

Synthetic Opalite (Man-made glass)

Opalite

Synthetic glass (SiO2 + impurities)

Opalite (Man-made Glass)

Fused glass (typically made of dolomite and metal opacifiers)

Titanium Amethyst Geode

Silicon Dioxide (SiO2) with Titanium/Metal Vapor Deposition Layer

Opalite

Man-made Synthetic Glass (Silicon Dioxide with metal additives)

Black beaded bracelet, likely black onyx or glass

Possibly chalcedony (microcrystalline quartz, SiO₂); the beads may instead be man-made glass

Blue-green cabochon, likely chalcedony or treated glass imitation

Cryptocrystalline quartz (chalcedony/possibly chrysoprase); identification uncertain from image

Opalite

Synthetic glass / Opalized glass

Opalite (Synthetic Moonstone/Opal)

Synthetic Silica Glass

Concrete fragment or Conglomerate

Artificial Conglomerate (Concrete) or Natural Conglomerate

Opalite (likely man-made glass)

Opalite; amorphous silica glass, not a natural mineral

Green obsidian (likely molded or heat-treated glass-like specimen)

Volcanic glass; predominantly rhyolitic composition (silica-rich amorphous SiO₂)

Likely bismuth crystal

Synthetic bismuth (Bi), crystallized from molten metal; not a natural rock-forming specimen

Asphalt Concrete

Bituminous Concrete (Anthropic Rock)

Opalite (likely imitation opal glass)

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

Possible obsidian or slag glass

Volcanic glass, primarily SiO₂; alternatively industrial iron-rich glassy slag

Blue goldstone beads

Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli

Beaded gemstone bracelet

Indeterminate; likely small polished mineral beads, possibly turquoise or dyed stone, with metal and glass components