Mineraloid (Anthropogenic)

Slag (Industrial Glassy Byproduct)

Ferro-silicate Slag

Ferrous Slag

Fused calcium-iron silicates (Industrial Slag)

Note: Item is not a geological specimen

Polyester mesh and Ethylene-vinyl acetate (EVA) polymer

Asphalt (Road Aggregate)

Bituminous Conglomerate / Asphalt Concrete

Build-A-Bear Plush (Non-Geological)

Polyester fibers (C10H8O4)n and Synthetic Polymers

Slag Glass (Cullet)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Ferro-Manganese Slag

Vitreous Silicate Slag

Mixed beach-stone and tumbled-glass collection

Predominantly uncertain rocks (likely basalt, granite, and quartz-bearing stones) with anthropogenic glass; one possible banded agate or jasper

Ferruginous Slag (Iron Smelting Byproduct)

Fused Silicate Scoria (Amorphous mixture of FeO, SiO2, and CaO)

Opalite

Synthetic Opalite Glass

Slag Glass

Amorphous Silica Glass (with metal oxide inclusions)

Red Coral

Corallium rubrum (Calcium Carbonate, CaCO3 with Carotenoid pigments)

Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)

Chalcedony (SiO₂)

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

Slag (Industrial Glass Slag)

Amorphous Silicate Glass (often containing Al, Ca, Mg, and Ti oxides)

Shell Cameo

Cypraecassis rufa (Bullmouth Queen Helmet Shell)

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

Amorphous Silica (SiO2) with copper or chromium additives

Opaline Glass (Opalite)

Synthetic Silicon Dioxide Glass

Slag (Industrial Glass/Metal Waste)

Artificial silicate/ferro-silicate byproduct

Man-made Crystal (Lead Glass)

Lead oxide-doped Silica Glass (approx. SiO2 + PbO)

Amber

Succinicum (Organic compound, primarily C10H16O)

Tektite (Indochinite)

Tektite (High-silica natural glass)

Amber (and Citrine Quartz)

Succinite (Amber) and Silicon Dioxide (SiO2)

Tektite (specifically Indochinite)

Tektite (Natural silica glass)

Cat's Eye Shell (Shiva Shell)

Operculum of the Turbo petholatus (Tapestry Turban Snail), predominantly Calcium Carbonate (Aragonite)

Red Jasper

Jasper (a variety of Chalcedony, SiO₂)

Opalite

Synthetic Opalized Glass

Amber

Succinite (specifically for Baltic amber); Approximate formula: C10H16O

Amber

Succinite (Resinite)

Slag Glass (Cullet)

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

Green Glass Slag

Amorphous Silicon Dioxide (SiO2) with metal oxide impurities

Baltic Amber (Butterscotch variety)

Succinite

Red Slag Glass

Amorphous Silica (Industrial byproduct with metallic oxide dopants)

Opalite

Synthetic Opalized Glass (SiO2 + additives)

Cullet Glass (sometimes mistaken for Blue Obsidian or Slag)

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

Opalite

Synthetic Opalite Glass (Silicon Dioxide)

Baltic Amber (Butterscotch or Egg Yolk Variety)

Succinite (C10H16O)

Green Slag Glass

Amorphous Silica / Glassy Blast Furnace Slag

Glass Nugget (Tumbled Glass)

Amorphous Silicon Dioxide (SiO2) with additives

Goldstone (Brown)

Aventurine glass

Painted Garden Rock (likely Granite or Limestone base)

Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments

Clay Brick

Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)