Mineral (Treated)

Faceted blue-violet gemstone, likely iolite or blue topaz

Likely cordierite (iolite), Mg2Al4Si5O18; alternative: topaz, Al2SiO4(F,OH)2

Blue Topaz (specifically London Blue shade)

Topaz - Al2SiO4(F,OH)2

Green glassy mineral specimen, likely rough emerald or green fluorite

Tentatively beryl (Be₃Al₂Si₆O₁₈), emerald variety; synthetic/man-made glass cannot be excluded from the photograph

Turquoise

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

Citrine

Silicon Dioxide with iron impurities (SiO2)

Blue polished/tumbled stone, likely blue apatite or dyed quartz

Apatite-group mineral, commonly fluorapatite (Ca5(PO4)3F); exact identification requires testing

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Tumbled Purple Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Yellow Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Dyed Quartz / Rose Quartz Imitation

Silicon Dioxide (SiO2) with artificial pigment

Black Onyx

Silicon dioxide (SiO2) with parallel banded structure

Green Quartz (including Prase or Aventurine variants)

Silicon Dioxide (SiO2) with inclusions (likely Actinolite or Chlorite)

Chalcopyrite (Peacock Ore)

Copper Iron Sulfide (CuFeS2)

Tumbled citrine quartz (probable)

Quartz, silicon dioxide (SiO₂), yellow variety commonly called citrine

Citrine

Silicon Dioxide (SiO2) with iron impurities

Orange Quartz (Citrine Quartz)

Silicon Dioxide (SiO2)

White Topaz

Topaz - Al2SiO4(F,OH)2

Yellow Topaz (Imperial/Golden Topaz)

Topaz - Al2SiO4(F,OH)2

Faceted amber-brown gemstone ring (likely citrine)

Citrine, yellow-to-brown variety of quartz (SiO₂); identification from the image is tentative

Turquoise jewelry beads/earrings

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly reconstructed or imitation turquoise

Raw Citrine (Yellow Quartz)

Citrine / Silicon Dioxide (SiO2)

Rainbow Quartz (Dyed/Coated Quartz)

Silicon Dioxide (SiO2) with artificial color enhancement

Black Onyx

Cryptocrystalline quartz (SiO2)

Tumbled turquoise (probable)

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Tumbled yellow chalcedony (likely citrine or yellow quartz)

Quartz, SiO₂; potentially microcrystalline chalcedony

Green Quartz (Prasiolite or Aventurine)

Silicon Dioxide (SiO2)

Prasiolite (Green Quartz) / Sea Glass Amalgam

SiO2 (Silicon Dioxide)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite

Turquoise ring (likely stabilized or imitation turquoise)

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; exact material is uncertain from the image

Polished amethyst or quartz chip

Quartz, silicon dioxide (SiO₂), likely purple amethyst with possible iron-oxide inclusions

Citrine

Silicon Dioxide (Quartz variety), SiO2

Heat-Treated Citrine (Amethyst Cathedral with Agate inclusions)

Silicon Dioxide (SiO2) with iron impurities

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

Peacock ore (likely chalcopyrite)

Iridescent tarnished chalcopyrite, CuFeS₂; sometimes marketed as bornite, Cu₅FeS₄

Tumbled citrine (likely quartz)

Quartz, SiO₂; yellow coloration may be natural citrine or heat-treated amethyst

Chert (Arrowhead Point)

Microcrystalline Quartz (SiO2)

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Druzy Agate (specifically Black Druzy Agate)

Silicon Dioxide (SiO2)

Blue Topaz

Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Polished tiger’s-eye

Quartz variety, primarily fibrous chalcedony pseudomorph after crocidolite; SiO₂

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities