Sedimentary (Or Mineraloid)

Amber

Succinite (Formula: C10H16O)

Libyan Desert Glass

Tektite (high-silica impact glass), SiO2 + tracing minerals

Slag (Industrial Glass Slag)

Amorphous Silica / Ferro-silicate Slag

Red Amber (Burmite/Cherry Amber)

Succinite / Retinite (Organic Fossilized Resin, C10H16O)

Amber

Succinite (with empirical formula approximately C10H16O)

Amber

Succinite (fossilized tree resin)

Precious Coral

Corallium rubrum (Calcium carbonate with trace carotene)

Cat's Eye Shell (Shiva Shell)

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

Tektite (Indochinite)

Tektite (High-silica natural glass)

Tektite (specifically Indochinite)

Tektite (Natural silica glass)

Amber (and Citrine Quartz)

Succinite (Amber) and Silicon Dioxide (SiO2)

Ferruginous Slag (Iron Smelting Byproduct)

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

Amber

Succinite (Resinite)

Amber

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

Cobalt Blue Sea Glass

Amorphous Silica Glass (SiO2 + CoO)

Baltic Amber (Butterscotch variety)

Succinite

Red Slag Glass

Amorphous Silica (Industrial byproduct with metallic oxide dopants)

Cullet Glass (sometimes mistaken for Blue Obsidian or Slag)

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

Slag Glass (Cullet)

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

Green Glass Slag

Amorphous Silicon Dioxide (SiO2) with metal oxide impurities

Green Slag Glass

Amorphous Silica / Glassy Blast Furnace Slag

Glass Nugget (Tumbled Glass)

Amorphous Silicon Dioxide (SiO2) with additives

Red Coral

Corallium rubrum (Calcium Carbonate, CaCO3 with Carotenoid pigments)

Green Slag

Anthropogenic Silicate Glass

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

Slag (Industrial Glass Slag)

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

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

Amorphous Silica (SiO2) with copper or chromium additives

Shell Cameo

Cypraecassis rufa (Bullmouth Queen Helmet Shell)

Opaline Glass (Opalite)

Synthetic Silicon Dioxide Glass

Ferruginous Slag (Iron Smelting Byproduct)

Anthropogenic Vitreous Silicate (often containing Fayalite: Fe2SiO4)

Man-made Crystal (Lead Glass)

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

Slag (Industrial Glass/Metal Waste)

Artificial silicate/ferro-silicate byproduct

Amber

Succinicum (Organic compound, primarily C10H16O)

Sandstone or Siltstone

Arenite (if sandstone)

Sandstone

Arenite (primarily SiO2)

Shale or Slaty Mudstone

Argillaceous sedimentary rock

Synthetic Resin / Plastic Figurine

Synthetic Polymer (Copolymer of Polyethylene or Resin)

Cullet Glass (Strawberry Glass)

Amorphous Silicon Dioxide (SiO2) with metallic dopants

Goldstone

Aventurine glass (Synthetic glass with copper inclusions)

Ambergris

Ambrein (C30H52O)

Chert Breccia

Brecciated Chert (Microcrystalline Silica)

Ambergris

Physeter macrocephalus excreta (Ambergris)