Mineraloid Like Synthetic Material

Bituminous Coal

Organic-rich sedimentary rock (Complex hydrocarbons)

Faceted glass-like gemstone (likely synthetic quartz or cubic zirconia)

Identification uncertain; possibilities include synthetic quartz (SiO₂) or cubic zirconia (ZrO₂)

Opalite

Synthetic Opalite Glass / Opalized Glass

Obsidian

Volcanic Glass (predominantly SiO2, approximately 70% or more)

Blue cabochon gemstone ring

Uncertain; likely blue sapphire (corundum, Al₂O₃), blue topaz, or synthetic glass/spinel

Emerald

Beryl (Be₃Al₂Si₆O₁₈), colored green by chromium and/or vanadium

Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation

SiO2 (if Quartz), ZrO2 (if Cubic Zirconia)

Faceted colored gemstones, likely synthetic corundum or glass imitations

Not identifiable from the image; possible synthetic corundum (Al₂O₃)

Green faceted gemstone, likely synthetic glass or peridot

Indeterminate from image; possible peridot (olivine, (Mg,Fe)₂SiO₄) or green synthetic glass

Obsidian

Volcanic Glass

Obsidian

Volcanic Glass (SiO2 + impurities)

Black Obsidian

Volcanic Glass (Amorphous SiO2 with trace impurities)

Obsidian

Volcanic Glass (SiO2)

Red gemstone ring (likely synthetic ruby or red glass)

Possibly corundum (Al₂O₃), chromium-colored; identity cannot be confirmed from the image

Faceted purple gemstone, likely amethyst

Quartz (SiO₂), purple variety colored by trace iron and natural irradiation

Man-made Synthetic Material (Plastic/Composite)

Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)

Obsidian (specifically Mahogany Obsidian)

Volcanic glass (high silica content, SiO2)

Black Obsidian

Volcanic Glass (predominantly SiO2, Silicon Dioxide)

Fulgurite

Fulgurite (Lechatelierite-rich fused silica)

Hematite bead bracelet

Hematite (iron(III) oxide, Fe₂O₃), likely polished specular hematite

Obsidian

Obsidian (Volcanic Glass)

Slag Glass (Cullet)

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

Amber

Succinite (Fossilized Tree Resin)

Fire Opal (in matrix)

Hydrated Silica (SiO2·nH2O)

Tektite (Indochinite)

Tektite (High-silica impact glass)

Ruby ring

Corundum (Al₂O₃), red variety colored mainly by chromium

Ruby

Corundum (Al2O3)

Obsidian

Amorphous volcanic glass (SiO2)

Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Black onyx or black spinel ring stone

Likely chalcedony (SiO₂), variety black onyx; possibly synthetic spinel or glass

Iridescent polished/tumbled stone (likely coated quartz or glassy synthetic material)

Indeterminate; possibly quartz (SiO₂) with an artificial iridescent coating

Obsidian

Obsidian (Volcanic Glass)

Obsidian

Volcanic Glass (SiO2)

Fulgurite

Lechatelierite

Amethyst (likely synthetic or treated)

Purple quartz, SiO₂; color caused mainly by trace iron and irradiation

Amber

Succinate (Fossilized Tree Resin)

Opalite

Man-made glass (traditionally simulated Opal)

Ruby-bearing rock (likely ruby in zoisite)

Corundum (ruby, Al₂O₃) in a zoisite-rich matrix; exact identification is uncertain from the photograph

Amber

Succinite

Cat's Eye Moonstone (Simulated/Synthetic or natural Cat's Eye Quartz/Glass)

There is no single scientific name. The appearance suggests either: Moonstone (feldspar group), Cat's Eye Quartz (SiO2), Apatite (Ca5(PO4)3(F,Cl,OH)), or most likely a synthetic material such as Fiber Optic Glass or 'Opalite' (a type of glass).

Black polished stone beads, likely black onyx or agate

Likely chalcedony (microcrystalline quartz, SiO₂); exact material cannot be confirmed from the image

Limonite (Yellow Ochre)

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