Mineraloid (Man Made Origin)

Opalite

Synthetic Fluorescent Glass (SiO2 + impurities)

Man-made Slag (Industrial Byproduct)

Anthropogenic Glassy Residue

Tumbled black obsidian (likely)

Volcanic glass; chiefly silica-rich rhyolitic glass (SiO₂)

Beads (likely glass or man-made material)

N/A (artificial material)

Cobalt Glass Slug (Man-made Glass)

Amorphous Silica with Cobalt Oxide (SiO2 + CoO)

Synthetic Resin / Plastic Figurine

Synthetic Polymer (Copolymer of Polyethylene or Resin)

Opalite

Synthetic glass / Opalized glass

Opalite

Synthetic Glass, SiO2 base with metallic inclusions

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

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

Iron Slag (Industrial Byproduct)

Anthropogenic Vitrification Product/Ferrous Slag

Opalite

Synthetic Opalized Glass (SiO2 + additives)

Opalite

Synthetic Opalised Glass

Man-made Metal Pin (Non-geological)

Antimony-Lead Alloy or Zinc/Brass Base with Electroplating

Opalite

Synthetic Opalite Glass

Metal Chain Belt with Square Plates

Not applicable (man-made)

Synthetic Resin Charm (Seal Shape)

Polymer Resin with plastic glitter / Polyethylene terephthalate glitters

Goldstone (Brown)

Aventurine Glass (Silicon Dioxide infused with Copper crystals)

Red glassy cabochon, likely synthetic ruby or red glass

Uncertain; possible synthetic corundum (Al₂O₃, chromium-colored) or man-made glass

One Pound Coin (UK)

Nickel-Brass Alloy (Cu-Zn-Ni)

Green Sea Glass

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

Man-made Glass (Tumbled/Shaped)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Opalite

Synthetic Opalized Glass

Opalite

Synthetic Opalite Glass (Silicon Dioxide)

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

Amorphous Silica (SiO2) with copper or chromium additives

Opalite

Synthetically produced glass (Silicon Dioxide with metallic inclusions)

Clear-stone silver-tone teardrop earring

The stones may be colorless quartz or glass; the image does not allow reliable identification. Metal setting appears silver-tone.

Jet

Lignite (Anthracite-grade compact coal)

Opalite

Synthetic glass / Opalized glass

Diamond (or Simulant)

Carbon (C) or relevant simulant formula (e.g., ZrO2 for Cubic Zirconia)

Red Slag Glass

Amorphous Silica (Industrial byproduct with metallic oxide dopants)

Not a geological specimen

N/A (man-made object)

Goldstone

Aventurine Glass (Man-made glass with copper inclusions)

ABS Plastic (Acrylonitrile Butadiene Styrene)

(C8H8)x·(C4H6)y·(C3H3N)z

Opalite

Synthetic glass (SiO2 + impurities)

Sea Glass (specifically Frosted White)

Amorphous Silica (substance: Sodium-calcium silicate glass)

Diamond

Native Carbon (C)

Cullet Glass (sometimes mistaken for Blue Obsidian or Slag)

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

Goldstone

Aventurine glass (Synthetic glass with copper inclusions)

Rose Quartz and Cherry Quartz (Dyed Glass/Quartz)

Silicon Dioxide (SiO2) with inclusions/dye

Blue Sapphire (Synthetic or Man-made Glass Imitation)

Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic

Opalite

Synthetic glass / Opaque silicious glass

Opalite

Man-made opalized glass