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

Pyrite (likely)

Pyrite, FeS₂

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

Red garnet cabochon pendant

Likely almandine garnet, iron-rich garnet-group silicate (often approximated as Fe₃Al₂(SiO₄)₃); identification from the image is uncertain.

Small gold-colored jewelry piece with clear stones

Likely a metal setting holding small faceted gemstones; the stones cannot be identified from the image.

Cubic Zirconia (CZ)

Zirconium dioxide (ZrO2)

Gemstone Ring

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

Spiny Oyster Shell

Spondylus (Calcium Carbonate, CaCO3)

Chakra Crystal Bracelet

Mixed Mineral Assortment

Tumbled stone

Unknown

Polished garnet bead (likely almandine)

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

Pearl jewelry

Pearl (biogenic calcium carbonate, primarily aragonite, CaCO₃)

Aquamarine

Beryl (Be3Al2Si6O18)

Cubic Zirconia (Man-made)

Cubic Zirconia (ZrO2) with Enamel and Metal Alloy

Tumbled amethyst (likely)

Quartz, SiO₂; purple variety known as amethyst

Quartz (Smoky/Brown variety)

Silicon dioxide (SiO2)

Likely faceted garnet

Garnet group, commonly almandine (Fe₃Al₂(SiO₄)₃); identification from the photo is uncertain

Epidote

Ca2(Al,Fe)3(SiO4)3(OH)

Likely rough amethyst (purple quartz)

Quartz, SiO₂; purple coloration typically caused by trace iron and natural irradiation

Purple amethyst crystal specimen

Amethyst, purple variety of quartz (SiO₂)

Not a rock, mineral, or geological specimen

Cubic Zirconia

Cubic Zirconium Dioxide (ZrO2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Emerald (green gemstone) pendant

Emerald, green variety of beryl (Be₃Al₂Si₆O₁₈); stones appear to be faceted and set in jewelry

Man-made Jewelry Charm (Enameled Metal)

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

Topaz

Al2SiO4(F,OH)2

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

Gem-set gold ring

Likely gold alloy set with a colorless gemstone, possibly diamond or clear quartz; the stone cannot be identified reliably from the image

Blue topaz-style pendant (stone identity uncertain)

Possibly blue topaz (Al₂SiO₄(F,OH)₂); the image cannot confirm whether the stone is natural or synthetic

Tumbled amethyst

Quartz, SiO₂; purple coloration from trace iron and irradiation

Quartz Crystal

Silicon Dioxide (SiO2)

Tumbled amethyst

Amethyst, purple variety of quartz (SiO₂)

Amethyst

Purple variety of quartz; silicon dioxide (SiO₂)

Tumbled yellow quartz (likely citrine or iron-stained quartz)

Quartz, SiO₂; yellow color may result from iron staining, but the photo cannot confirm citrine

Amethyst beads

Amethyst, purple quartz (SiO₂)

Amethyst (polished bead)

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