Synthetic Glass (Often Categorized As A Simulated Mineral)

Polished labradorite cabochon

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

Agate (Polished Sphere)

Silicon Dioxide (SiO2)

Tumbled blue-green stone, possibly aquamarine or chalcedony

Indeterminate from image; possibilities include beryl (Be₃Al₂Si₆O₁₈) or cryptocrystalline quartz (SiO₂)

Emerald

Beryl (Be3Al2(SiO3)6) with trace Chromium/Vanadium

Turquoise-colored ring stone (possibly turquoise or imitation)

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; identity cannot be confirmed from the image

Ruby (Corundum)

Aluminum oxide (Al2O3) with Chromium traces

Diamond (or Diamond Simulant)

Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia - ZrO2, Moissanite - SiC)

Iolite (Cordierite)

Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18

Colorless faceted gemstones, likely quartz (rock crystal)

Quartz, silicon dioxide (SiO₂), trigonal crystal system

Hematite

Iron(III) oxide (Fe2O3)

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Faceted Diamond or Cubic Zirconia

Carbon (C) for Diamond; Zirconium dioxide (ZrO2) for CZ

The user-provided image does not contain a rock or mineral specimen

Blue cabochon gemstone, likely synthetic glass or dyed stone

Indeterminate from image; possible glass, synthetic spinel, sodalite, or lapis lazuli

Ruby-bearing rock (likely ruby in zoisite)

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

Tumbled turquoise cabochon

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O

Labradorite cabochon

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

Amethyst ring

Amethyst, purple quartz (SiO₂)

Green aventurine bead (likely)

Quartz, SiO₂, with green fuchsite inclusions

Pink amethyst or pale pink quartz gemstone

Quartz, SiO₂; pink coloration may result from microscopic inclusions or irradiation-related defects

Yellow faceted gemstone, likely citrine or synthetic glass

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

Ruby

Corundum (Aluminium Oxide with Chromium impurities, Al2O3:Cr)

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

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

Faceted colorless gemstone, likely glass or diamond imitation

Unidentified; possibly diamond (carbon, C) or cubic zirconia (zirconium dioxide, ZrO₂)

Smoky Quartz

Silicon Dioxide (SiO2)

Ruby

Corundum (Al2O3)

Faceted dark gemstone, likely black spinel

Spinel, MgAl₂O₄ (visual identification is uncertain; black sapphire or other dark gems can look similar)

Asphalt (Bituminous Concrete)

Bituminous mix / Anthropogenic conglomerate

Amethyst ring

Amethyst, purple quartz (SiO₂), likely set with diamond or other accent stones

Yellow Sapphire

Corundum (Al2O3:Fe)

Likely bismuth crystal

Synthetic bismuth (Bi), crystallized from molten metal; not a natural rock-forming specimen

Moonstone cabochon (probable)

Adularescent feldspar, usually orthoclase–albite intergrowth (KAlSi3O8–NaAlSi3O8)

Faceted citrine-colored gemstone (likely synthetic/display stone)

Quartz, SiO₂, if natural citrine; possibly synthetic sapphire or glass imitation

Blue Sandstone

Man-made glass with cobalt and copper inclusions

Silicon

Crystalline Silicon (Si)

Synthetic Costume Accessory (Non-Geological)

Polyester and Acrylic Fiber (Anthropogenic polymer)

White Sapphire

Corundum (Al2O3)

Red faceted gemstone, likely synthetic ruby

Corundum (Al₂O₃); ruby when red, possibly laboratory-grown

Faceted citrine-colored gemstone

Likely citrine (quartz, SiO₂); possibly yellow glass or synthetic gem

Polished tiger’s-eye

Quartz variety, SiO₂, with crocidolite-derived iron inclusions

Hematite bead bracelet

Hematite (iron(III) oxide, Fe₂O₃), likely polished magnetic hematite or hematite-coated beads

Blue Sapphire

Corundum (Al2O3)