Mineral, Jewelry

Black Tourmaline (Schorl) in Matrix

NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)

Beaded Jewelry (Assorted Gemstones)

Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ

Fossil Coral (Rugose Coral / Horn Coral fragment)

Rugosa (Tetracoralla) / Calcite (CaCO3)

Amethyst druzy quartz

Quartz, SiO₂; purple variety colored mainly by iron-related defects

Serpentinite (likely serpentine-rich rock)

Serpentinite; chiefly serpentine-group minerals, Mg3Si2O5(OH)4

Blue sodalite beads

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

Likely serpentinized ultramafic rock (serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, possibly with magnetite, chromite, and brucite

Cubic Zirconia (CZ)

Zirconium dioxide (ZrO2)

Spiny Oyster Shell

Spondylus (Calcium Carbonate, CaCO3)

Gemstone Ring

Various (Likely Glass, Cubic Zirconia, or assorted semi-precious stones)

Chakra Crystal Bracelet

Mixed Mineral Assortment

Polished garnet bead (likely almandine)

Almandine garnet, Fe₃Al₂(SiO₄)₃ (tentative visual identification)

Tumbled stone

Unknown

Quartz (Smoky/Brown variety)

Silicon dioxide (SiO2)

Not a rock, mineral, or geological specimen

Cubic Zirconia (Man-made)

Cubic Zirconia (ZrO2) with Enamel and Metal Alloy

Purple amethyst crystal specimen

Amethyst, purple variety of quartz (SiO₂)

Cubic Zirconia

Cubic Zirconium Dioxide (ZrO2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Man-made Jewelry Charm (Enameled Metal)

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

Turquoise (Dyed Howlite/Magnesite imitation)

CuAl6(PO4)4(OH)8·4H2O (Target mineral) / Ca2B5SiO9(OH)5 (Actual specimen: Howlite)

Mystic Topaz (Treated Quartz or Topaz)

Aluminum silicate fluoride hydroxide [Al2SiO4(F,OH)2] with thin-film metallic coating

Tumbled amethyst

Quartz, SiO₂; purple color typically from trace iron and natural irradiation

Amethyst (likely tumbled or polished)

Quartz, SiO₂; purple color commonly caused by trace iron and natural irradiation

Yellow Quartz

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Faceted transparent gemstone, likely glass or cubic zirconia

Uncertain from image; possible cubic zirconia (zirconium dioxide, ZrO₂) or glass imitation

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Nephrite Jade

Nephrite

Malachite-bearing Rock

Cu2CO3(OH)2

Green cabochon gemstone pendant, likely turquoise or dyed green turquoise

Probably turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; exact identification requires testing

Shark Tooth Fossil

Vertebrate fossilized tooth (various genera such as Carcharodon, Otodus, or Negaprion)

Pale green stone, possibly serpentine

Serpentinite (dominantly serpentine-group minerals; visual identification is uncertain)

Ruby (in costume jewelry context)

Corundum (Al2O3) with Chromium impurities

Beaded gemstone bracelet

Indeterminate; likely small polished mineral beads, possibly turquoise or dyed stone, with metal and glass components

Turquoise

Turquoise, CuAl6(PO4)4(OH)8·4H2O

White druzy quartz pendant with a blue crystal accent

Quartz (SiO₂); the blue material is not identifiable from the image

Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Polished dendritic agate cabochon

Microcrystalline quartz (chalcedony), SiO₂, with iron/manganese dendrites and possible plume inclusions

Native gold (small nugget or grain)

Native gold, Au