Mineral (Treated)

Polished citrine quartz point

Quartz, silicon dioxide (SiO₂), yellow-orange variety commonly sold as citrine; possibly heat-treated amethyst

Citrine

Silicon Dioxide (SiO2)

Aqua Aura Quartz

Titanium/Gold-coated Silicon Dioxide (SiO2)

Raw Citrine

Citrine (Silicon Dioxide, SiO2)

Jadeite and Mixed Gemstones (Ruby, Sapphire, Emerald)

Jadeite (NaAlSi2O6), Corundum (Al2O3), Beryl (Be3Al2(Si6O18))

Tumbled turquoise

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

Tiger's Eye

Silicon dioxide (SiO2) with crocidolite inclusions

White Topaz

Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2

Dyed howlite or turquoise imitation

Howlite: Ca₂B₅SiO₉(OH)₅; turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O

Yellow Quartz

Silicon Dioxide (SiO2)

Citrine Geode Fragment

Citrine (Silicon Dioxide with Iron Impurities), SiO2

Polished black stone pendant

Likely black obsidian or black tourmaline; exact identification is uncertain from the photograph

Yellow Quartz (Citrine appearance)

Silicon Dioxide (SiO2)

Polished labradorite slab

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

Sphalerite with Galena

Zinc Sulfide ((Zn,Fe)S) and Lead Sulfide (PbS)

Citrine Quartz

Quartz (SiO2) - specifically, a variety of macrocrystalline quartz

Citrine

Silicon Dioxide (SiO2) - Yellow Quartz variety

Mixed mineral and crystal specimens

Likely quartz varieties and other common minerals; exact identification is uncertain from the image

Citrine Quartz

Silicon Dioxide (SiO2)

Citrine

Silicon dioxide (SiO2)

Raw greenish quartz (likely prasiolite or included quartz)

Quartz, silicon dioxide (SiO₂); green color may reflect iron-bearing inclusions or irradiation-related prasiolite

Tumbled blue stone with a drilled hole

Likely dyed or naturally blue chalcedony/agate; identity cannot be confirmed from the photo

Citrine Quartz

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine/Lemon Quartz)

Silicon Dioxide (SiO2)

African Turquoise

African Turquoise (a trade name for Jasper, a variety of Chalcedony: SiO2)

Aura Quartz (Cranberry or Magenta Aura Quartz)

Silicon dioxide coated with titanium/niobium (SiO2)

Yellow Quartz (Citrine or Citrine-colored Quartz)

Silicon Dioxide (SiO2)

Citrine and Quartz

Silicon Dioxide (SiO2)

Mystic Topaz (Treated Quartz or Topaz)

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

Green beryl, likely emerald rough

Beryl, Be₃Al₂Si₆O₁₈; green color commonly from chromium or vanadium

Blue-green opal, likely polished common or synthetic opal

Opal (hydrated amorphous silica, SiO₂·nH₂O); identification from the image is uncertain

Citrine Quartz

Silicon Dioxide (SiO2)

Tumbled jadeite or nephrite jade bead bracelet

Jade: jadeite (NaAlSi₂O₆) or nephrite, a tremolite–actinolite amphibole aggregate

Yellow Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

Red chalcedony (likely dyed or heat-treated)

Microcrystalline quartz, SiO₂; possibly red agate/carnelian

Yellow Quartz (Citrine / Golden Quartz)

Silicon Dioxide (SiO2)

Tumbled blue-green stone, likely amazonite

Amazonite, a green microcline feldspar (KAlSi₃O₈)

Titanium Amethyst Geode

Silicon Dioxide (SiO2) with Titanium/Metal Vapor Deposition Layer

Citrine Quartz (Tumbled)

Silicon Dioxide (SiO2)

Honey quartz crystal cluster

Quartz, silicon dioxide (SiO₂), likely iron-stained or inclusion-rich quartz

Lepidolite

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

Amethyst (Agate/Chalcedony variety)

Silicon Dioxide (SiO2) with iron impurities