Anthropogenic (Man Made Industrial Deposit)

Likely polished quartz or glass-like mineral cabochon

Probably quartz (SiO₂), though the image cannot exclude man-made glass

Cullet Glass (sometimes mistaken for Blue Obsidian or Slag)

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

Slag Glass

SiO2 (Silicon Dioxide) with impurities

Sea Glass

Silicon dioxide (mostly)

Blue crystal pendant (likely blue glass or synthetic crystal)

Not identifiable from the image; possibly synthetic quartz or glass, rather than a natural mineral

Conglomerate

Conglomerate (clastic sedimentary rock)

Blue Obsidian (Cullet Glass)

Silicon Dioxide (Amorphous Glass)

Cubic Zirconia (Simulated Diamond)

Cubic Zirconia (ZrO2)

Cullet (Slag Glass)

Amorphous Silica (Industrial byproduct)

Ocean Jasper Mushroom

Orbicular Jasper (Silicon Dioxide, SiO2 mixed with various impurities)

Concrete with Aggregate

Composite construction material; primary matrix is Calcium Silicate Hydrate (C-S-H)

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), opaque-to-translucent milky variety

Carborundum

Silicon Carbide (SiC)

Clear quartz tumbled stone

Quartz (silicon dioxide, SiO₂)

Tumbled milky quartz

Quartz — silicon dioxide (SiO₂), cryptocrystalline or microcrystalline variety possible

Chert (Arrowheads)

Microcrystalline Quartz (SiO2)

Red Slag Glass

Amorphous Silica (Industrial byproduct with metallic oxide dopants)

Carborundum (Silicon Carbide)

Silicon Carbide (SiC) / Moissanite (natural form)

Green Quartz / Chrysoprase / Sea Glass

Silicon Dioxide (SiO2)

Dyed Agate

Chalcedony (SiO2)

Slag (Industrial Glass/Byproduct)

Anthropogenic Vitreous Silicate

Green glass sphere/marble

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

Purple glassy pebble, possibly slag glass

Unidentified; likely man-made glass rather than a natural mineral

Cobalt Glass Slug (Man-made Glass)

Amorphous Silica with Cobalt Oxide (SiO2 + CoO)

Green Glass (often marketed as 'Obsidian' or 'Green Quartz')

Amorphous Silica (SiO2) with copper or chromium additives

Man-made Carved Stone (Scream Mask/Skull motif)

Carved Soapstone or Serpentine-rich rock

Man-made Blank Ammunition (Brass)

CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)

Slag (Industrial)

N/A (Anthropogenic Slag)

Mother of Pearl (Nacre)

Aragonite (CaCO3) with Organic Matrix

Sea Glass (White/Clear)

Amorphous Silica (Alkali-Lime-Silica Glass), SiO2 + Na2O + CaO

Blue-green faceted gemstone, possibly glass or synthetic material

Not identifiable from the image; possible synthetic spinel or glass

Asphalt (Road Aggregate)

Bituminous conglomerate

Chert Arrowhead

Microcrystalline Quartz (SiO2)

Green Sea Glass

Amorphous Silica (man-made glass), SiO2 + additive metal oxides

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 synthetic glass with opalescent effects (SiO2 + metal oxides)

Slag Glass (Cullet)

Amorphous Silica (man-made), primarily SiO2 with trace metal oxides

Terrazzo (Man-made Composite)

Cementitious or Resin-bound Lithic Composite

Iron Slag

Anthropogenic Iron Silicate

Polished blue calcite sphere (tentative identification)

Calcite, CaCO₃; blue color generally results from trace impurities or inclusions

Green Sea Glass

Man-made silicate glass (weathered)