Not A Rock (Man Made Polymer)

Opalite

Synthetic Opalite Glass / Opalized Glass

Possible obsidian or slag glass

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

Clear quartz tumbled stone

Quartz (silicon dioxide, SiO₂)

Polished black pebble, likely basalt

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

Rock crystal quartz fragments

Quartz (silicon dioxide, SiO₂)

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

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

Green Obsidian Sphere (man-made glass)

Vitreous Silica with Chromium/Iron additives

Opalite

Synthetic Opalite (Man-made glass)

Concrete with Exposed Aggregate

Anthropogenic conglomerate (Concrete)

Chipped Glass/Plastic Fragment

Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic

Quartzite (Engineered Stone)

Silicon Dioxide (SiO2) based synthetic composite

Goldstone

Man-made glass with copper inclusions

Cullet Glass (Slag)

Amorphous Silicon Dioxide (Man-made)

Green Sea Glass

Man-made silicate glass (weathered)

Polished dendritic agate or jasper

Microcrystalline quartz (SiO₂), likely chalcedony with iron/manganese dendrites

Likely iron-rich slag or weathered ironstone fragment

Uncertain; possibly iron oxide–rich material (hematite/goethite) or industrial iron slag

Blue-green faceted gemstone, possibly glass or synthetic material

Not identifiable from the image; possible synthetic spinel or glass

Vesicular basalt (probable iron-rich volcanic rock)

Basalt; chiefly plagioclase, clinopyroxene, olivine, and Fe-Ti oxides

Crushed Stone (Likely Limestone or Granite)

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

Mystic Topaz (Treated Quartz or Topaz)

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

Sandstone Concretion

Limonitic Sandstone Concretion

Opalite (Man-made Glass)

Fused glass (typically made of dolomite and metal opacifiers)

Asphalt (Bituminous Concrete)

Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)

White sea glass (naturally frosted glass fragment)

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

Red goldstone beads

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

Iron Slag (Industrial Byproduct)

Anthropogenic Vitrification Product/Ferrous Slag

Faceted clear gemstone in a gold-colored setting

Unidentified transparent faceted stone; possibly quartz, glass, or another colorless gem

Green sea glass (likely bottle glass)

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

Green sea glass (likely bottle glass)

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

Obsidian

Volcanic glass

Baked-clay ceramic fragment (likely brick or pottery)

Fired clay, primarily aluminosilicate minerals; not a natural rock

Chert Arrowhead (Projectile Point)

Microcrystalline Quartz (Chert or Flint)

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial Man-made)

Green sea glass (likely)

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

Sea Glass

Amorphous silicon dioxide (Man-made glass weathered by wave action)

Sandstone Concretion

Clastic Sedimentary Rock (primarily SiO2 with mineral cement)

Sea Glass

Man-made vitreous material / Silicon dioxide

Sandstone Concretion

Clastic sedimentary rock (primarily Quartz SiO2)

Slag

Ferrous Slag (Amorphous calcium-magnesium-aluminum silicates)

Slag (Industrial Glass/Glassy Rock)

Anthropogenic Vitreous Material

Titanium-coated Metal Cube (Man-made Fidget Toy)

Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)

Clear quartz fragment (rock crystal)

Quartz, silicon dioxide (SiO₂)