Mineraloid Like Synthetic Material

Amber (Copal)

Succiniferous Resin

Opal

Hydrated silica (SiO2·nH2O)

Green Opal or Yellow Opal

Hydrated Silica (SiO2·nH2O)

Tektite (Indochinite)

Impact Glass (SiO2 + Al2O3)

Cubic Zirconia (Faceted)

Zirconium dioxide (ZrO2)

Polished mahogany obsidian (probable)

Volcanic glass; chiefly rhyolitic silica-rich glass (SiO₂), compositionally near rhyolite

Obsidian

Volcanic Glass (SiO2)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)

Polished mahogany obsidian (likely)

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

Amber / Copal

Succinite (fossilized resin)

Amber

Succinite (Fossilized Tree Resin)

Pink corundum (likely synthetic or treated sapphire)

Corundum, Al₂O₃; pink coloration commonly from chromium or treatment

Gem-set gold ring

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

Cullet (Slag Glass)

Amorphous Silica (SiO2) with various metal oxide colorants

Faceted red gemstone, likely ruby

Corundum (Al₂O₃), colored red by chromium; identification from the image is uncertain

Pink faceted gemstone ring (stone uncertain)

Possibly tourmaline or glass; image alone cannot establish identity

Snowflake Obsidian

Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)

Opalite

Synthetic Glass (Simulated Opal)

Amber (specifically Red or Cherry Amber)

Succinite (Resinite); Chemical formula: C10H16O

Cubic Zirconia

Zirconium dioxide (ZrO2)

Obsidian

Volcanic Glass

Black Obsidian

Volcanic Glass (SiO2)

Faceted clear gemstone in a gold-colored ring

Unidentified colorless faceted gem; possibly quartz, glass, or another transparent gem material

Amber

Succinite (approximate formula C10H16O)

Common Opal (Green Opal / Pistachio Opal)

Hydrated silica (SiO2·nH2O)

Limonite/Goethite on Shale

Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock

Dyed turquoise bead

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; likely stabilized or reconstructed turquoise

Amber

Succinite (with approximate formula C10H16O)

Amber

Succinite (organic hydrocarbon)

Obsidian

Obsidian (volcanic glass), primarily SiO2 (silicon dioxide)

Yellow faceted gemstone, likely citrine or synthetic glass

Citrine (quartz, SiO₂) is the leading natural possibility; visual identification is uncertain from the photograph

Mahogany Obsidian

Volcanic Glass with Hematite (SiO2 + Fe2O3)

Snowflake Obsidian

Spherulitic Obsidian (Volcanic Glass with Cristobalite inclusions)

Blue Goldstone

Synthetic Avanturine Glass (or Aventurine Glass)

Leland Blue Stone

Anthropogenic Iron Smelting Slag

Amber

Succinite

Opalite (likely man-made glass)

Opalite; amorphous silica glass, not a natural mineral

Black Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Aura Quartz

Silicon Dioxide (SiO2) with Titanium/Metal vapor coating

Obsidian

Volcanic Glass (predominantly SiO2)

Carved labradorite fish

Labradorite, calcium-rich plagioclase feldspar (approximately (Ca,Na)(Al,Si)₄O₈)

Blue glassy mineral fragment, possibly sodalite or dyed/cobalt glass

Uncertain; likely sodalite (Na₈Al₆Si₆O₂₄Cl₂) if natural, but vivid blue color may indicate cobalt-colored glass