Mineral (Treated)

Dyed or treated agate bead strand (likely blue-green and brown banded agate)

Agate, a banded variety of microcrystalline quartz (SiO₂)

Peacock ore

Iridescent chalcopyrite, commonly marketed as bornite

Quartz (Citrine)

Silicon Dioxide (SiO2)

Quartz-bearing pyrite–chalcopyrite specimen

Pyrite (FeS₂), likely chalcopyrite (CuFeS₂), with quartz (SiO₂)

Yellow Quartz (or Citrine Quartz)

Silicon Dioxide (SiO2)

Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Red Jade (Dyed Quartzite)

Silicon Dioxide (SiO2) - variety Quartzite

Dyed turquoise bead

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; likely stabilized or reconstructed turquoise

Chalcopyrite

Chalcopyrite (CuFeS2)

Dyed Agate (Dragon Vein Agate Bead)

Silicon dioxide (SiO2) variety Chalcedony

Polished turquoise-colored stone, likely chrysoprase or dyed agate

Uncertain; possible chalcedony (microcrystalline SiO₂) or turquoise (hydrous copper aluminum phosphate)

Larimar (blue pectolite) bead bracelet

Pectolite, NaCa₂Si₃O₈(OH); blue color from copper-related impurities

Black Onyx

Silicon Dioxide (SiO2)

Turquoise-and-coral silver jewelry brooch

Turquoise: hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O; red cabochons appear to be coral, likely set in silver

Polished agate (likely moss or plume agate)

Microcrystalline quartz, SiO₂ (chalcedony)

Citrine

Silicon Dioxide (SiO2)

Black Onyx

Cryptocrystalline Quartz (SiO2)

Green Fluorite (likely synthetic or heat-treated for jewelry)

Calcium Fluoride (CaF2)

Chalcopyrite (Peacock Ore)

Chalcopyrite (CuFeS2)

Druzy quartz geode slice

Quartz, SiO₂, commonly lining a chalcedony-rich geode

Blue glassy mineral fragment, likely kyanite or blue corundum

Tentatively kyanite (Al₂SiO₅); visual identification is uncertain from the photograph

Citrine Quartz

Silicon Dioxide (SiO2)

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

Quartz, silicon dioxide (SiO₂); yellow color likely from iron-related impurities

Tumbled quartz pebble, possibly citrine or iron-stained quartz

Quartz (SiO₂), likely microcrystalline or granular quartz

Tumbled quartz-rich pebble, possibly citrine or iron-stained quartz

Quartz, silicon dioxide (SiO₂), with probable iron-oxide inclusions

Tumbled blue-green stone, likely chrysoprase or dyed agate

Chalcedony (microcrystalline SiO₂), possibly nickel-bearing chrysoprase

Tumbled citrine or yellow quartz

Quartz, silicon dioxide (SiO₂); likely iron-colored citrine or iron-stained quartz

Malachite

Malachite — Cu₂CO₃(OH)₂, copper carbonate hydroxide

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

Quartz, SiO₂; yellow coloration likely from iron impurities or irradiation-related defects

Amethyst Geode

Silicon Dioxide (SiO2) with iron impurities

Tumbled amethyst

Amethyst, purple quartz (SiO₂) colored by trace iron and irradiation

Blue Quartz

Silicon Dioxide (SiO2)

Citrine Quartz

Silicon Dioxide (SiO2)

Citrine

Citrine (Silicon Dioxide, SiO2)

Peacock Ore (Bornite or Iridescent Chalcopyrite)

Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with tarnish

Black Onyx

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Citrine

Citrine (Silicon Dioxide - SiO2)

Red Garnet (Almandine-Pyrope series)

Garnet Group, Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)

Yellow Quartz (Citrine Quartz Pebble)

Silicon Dioxide (SiO2)

Polished orange agate beads

Chalcedony, microcrystalline quartz (SiO₂), commonly sold as agate

Likely dyed or naturally vivid-blue copper mineral specimen

Possibly chrysocolla (hydrated copper silicate); image alone cannot confirm the mineral or whether the color is treated