Mineraloid (Man Made Glass)

Obsidian

Volcanic Glass (Silica-rich, SiO2)

Black obsidian

Volcanic glass; predominantly silica-rich, noncrystalline SiO₂

Obsidian

Obsidian

Black Obsidian

Volcanic Glass (SiO2 + MgO / Fe3O4)

Obsidian

Obsidian (Volcanic Glass), primarily SiO2

Gold Sheen Obsidian

Volcanic Glass (SiO2 + impurities)

Obsidian

Obsidian (Volcanic Glass, SiO2)

Sea glass (likely pale blue glass)

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

Obsidian (likely Apache tear or flaked obsidian)

Volcanic glass; primarily rhyolitic silica glass (SiO₂-rich, non-crystalline)

Polished mahogany obsidian (likely)

Volcanic glass; primarily silica-rich rhyolitic glass (SiO₂), with iron oxides

Black obsidian (likely)

Volcanic glass; primarily silica-rich, noncrystalline SiO₂ composition

Green sea glass (likely)

Anthropogenic glass, not a mineral; composition commonly soda–lime silicate glass

Tumbled black stone, likely obsidian

Obsidian — volcanic glass, chiefly silica-rich rhyolitic composition

N/A - Man-made object (Jewelry Chain)

Antiqued or Oxidized Metal Chain (often Steel or Brass)

Man-made Jewelry Charm (Enameled Metal)

Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.

Goldstone (aventurine glass)

Synthetic copper-bearing soda-lime glass; commonly sold as red goldstone

Snowflake Obsidian

Spherulitic Volcanic Glass (SiO2 + impurities)

Obsidian

Volcanic glass

Obsidian

Obsidian (Volcanic Glass)

Sea Glass

Amorphous Silicon Dioxide (SiO2)

Man-made Metal Pin (Non-geological)

Antimony-Lead Alloy or Zinc/Brass Base with Electroplating

Obsidian (specifically Mahogany Obsidian)

Volcanic glass (high silica content, SiO2)

Obsidian

Volcanic Glass (SiO2 rich)

Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Blue glass-like bead or gemstone keychain ornament

Indeterminate; likely cobalt-blue glass or synthetic blue spinel, not identifiable as a natural mineral from the image

Obsidian

Volcanic Glass (SiO2)

Obsidian

Volcanic glass (high silica volcanic rock)

Obsidian

Volcanic Glass (SiO2 + impurities)

Mahogany Obsidian

Obsidian (Volcanic Glass with Hematite inclusions)

Mahogany Obsidian

Volcanic glass (SiO2 with Hematite or Magnetite inclusions)

Amber (Black)

Amber (succinite, retinite, etc., specifically, heavily included/dark varieties)

Gem-set gold ring

Unidentified transparent gemstone, possibly quartz or glass, set in a gold-colored metal ring

Polished mahogany obsidian

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

Obsidian (likely black obsidian)

Volcanic glass; primarily SiO₂-rich rhyolitic composition

Polished black obsidian

Volcanic glass; primarily silica-rich rhyolitic glass (approximately 70–80% SiO₂)

Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)

Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)

Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)

Silicon Dioxide (SiO2) with metallic inclusions

Obsidian (black volcanic glass)

Obsidian; predominantly silica-rich volcanic glass, commonly rhyolitic (approximately 70–75% SiO₂)

Black obsidian

Volcanic glass, primarily rhyolitic silica glass (SiO₂-rich, noncrystalline)

Mahogany Obsidian

Volcanic glass (Silicon Dioxide with Hematite/Magnetite inclusions)

Obsidian (likely black volcanic glass)

Obsidian; silica-rich, noncrystalline volcanic glass, typically rhyolitic (approximately 70–75% SiO₂)

Obsidian

Volcanic Glass (Silicon Dioxide with impurities)