Mineral (Treated)

Polished brown agate beads

Microcrystalline quartz (SiO₂), commonly classified as chalcedony; the exact variety cannot be determined from the image

Citrine

Citrine (Silicon Dioxide, SiO2)

Rough Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)

Orange Tabby (Felis catus)

Felis silvestris catus (variety: Red Mackerel Tabby)

Raw Citrine Quartz

Silicon Dioxide (SiO2)

Green Quartz / Prasiolite

Silicon Dioxide (SiO2)

Citrine Quartz (Heat-Treated Amethyst)

Silicon Dioxide (SiO2)

Citrine

Yellow Quartz (SiO2)

Tumbled yellow quartz (likely citrine)

Quartz, silicon dioxide (SiO₂), iron-colored variety

Citrine

Silicon Dioxide (SiO2) with trace Iron

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Peacock ore (likely chalcopyrite-bornite specimens)

Iridescent chalcopyrite, CuFeS₂, commonly altered to bornite, Cu₅FeS₄

Dyed Agate Geode (Pink/Magenta)

Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz

White quartz bead bracelet (likely milky quartz)

Quartz, silicon dioxide (SiO₂), usually microcrystalline or cloudy crystalline quartz

Polished blue chalcedony (likely blue quartz/chalcedony cabochon)

Chalcedony, cryptocrystalline SiO₂; possibly dyed or treated common quartz

Malachite-bearing decorative stone (possibly dyed or resin-coated)

Malachite, Cu₂CO₃(OH)₂; the underlying matrix is not identifiable from the image

Likely clear quartz pebble or glassy quartz fragment

Quartz (silicon dioxide, SiO₂)

Quartz (Yellow/Citrine variety)

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine/Yellow Chalcedony)

Silicon Dioxide (SiO2)

Amethyst and Titanium Treated Druzy

Silicon Dioxide (SiO2) with trace impurities including Iron

Turquoise cabochon ring

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

Yellow Quartz

Silicon Dioxide (SiO2)

Fossilized shell or coral fragment

Likely silicified or calcitic marine invertebrate fossil; exact taxon indeterminate from the image

Polished black-and-gold mineral fragment, likely chalcopyrite

Chalcopyrite (CuFeS₂), possibly tarnished or coated

Blue Topaz

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

Citrine

Silicon Dioxide (SiO2)

Bornite

Bornite (Cu5FeS4)

Blue chalcedony (likely dyed or coated)

Chalcedony, microcrystalline quartz (SiO₂)

Yellow-brown translucent mineral fragment, likely citrine or amber

Quartz (SiO₂), if citrine; succinite (fossil resin), if amber

Citrine Quartz

Silicon Dioxide (SiO2)

Red coral bead necklace

Precious coral, typically Corallium spp.; calcium carbonate (aragonite/calcite)

Bornite (“peacock ore”), likely weathered copper sulfide

Bornite, Cu₅FeS₄; possibly chalcopyrite, CuFeS₂, with iridescent tarnish

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Polished blue-green metallic mineral specimen, likely bornite (“peacock ore”)

Bornite, Cu₅FeS₄; possibly chalcopyrite, CuFeS₂, with iridescent tarnish

Tumbled turquoise (probable)

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

Dyed Pink Quartzite

Tumbled and Dyed Quartzite (SiO2 with dye treatment)

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

Quartz, silicon dioxide (SiO₂), colored yellow by iron impurities; exact variety cannot be confirmed visually

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

Quartz, silicon dioxide (SiO₂), possibly Fe³⁺-colored citrine

Yellow-orange quartz (likely citrine or iron-stained quartz)

Quartz, silicon dioxide (SiO₂), colored by iron impurities or irradiation

Tumbled blue chalcedony

Chalcedony, microcrystalline quartz (SiO₂)

Likely polished dark stone (identity uncertain)

Undetermined; possibly polished basalt, chert, or another dark silicate rock