Tektite (Natural Glass)

Likely amethyst (purple quartz) fragment

Quartz, SiO₂; purple variety colored by trace iron and irradiation

Quartz (Yellow/Citrine Variety)

Silicon Dioxide (SiO2)

Polished gray-blue agate slice pendant

Agate, a banded microcrystalline variety of chalcedony (SiO₂)

Yellow faceted gemstone, likely citrine or yellow sapphire

Uncertain; probable quartz (SiO₂) or corundum (Al₂O₃)

Obsidian

Volcanic Glass (Amorphous SiO2)

Green sea glass (likely bottle glass)

Human-processed soda–lime silicate glass; not a natural mineral or rock

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Quartz pebble

Silicon dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Polished amber-colored quartz (likely citrine or iron-stained quartz)

Quartz, SiO₂; yellow color from trace iron and/or inclusions

Pink Quartz / Agate pebble

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Tumbled black stone, likely black obsidian

Obsidian — natural volcanic glass, primarily SiO₂

Tumbled quartz (likely citrine or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Pumice

Volcanic glass / Pumiceous rock

Bull Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Polished black pebble, possibly obsidian

Volcanic glass (obsidian), likely; identification is tentative from the image

Polished mahogany obsidian

Volcanic glass, primarily rhyolitic composition (SiO₂-rich); mahogany coloration from iron-oxide inclusions

Dyed blue chalcedony (likely dyed agate or quartzite)

Chalcedony, microcrystalline SiO₂; blue color likely artificial dye

Tumbled black stone, likely black obsidian

Obsidian (volcanic glass; predominantly SiO₂)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Green Aventurine

Silicon Dioxide (Quartz) with inclusions of Fuchsite mica (K(Al,Cr)2(AlSi3O10)(OH)2)

Peach Aventurine

Quartz variety (SiO2 + Hematite/Goethite inclusions)

Green Aventurine (Propably a tumbled variety)

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions

Aventurine Quartz

Silicon Dioxide (SiO2) with Fuchsite inclusions

Aventurine Quartz

Silicon dioxide with inclusions (KAl2(AlSi3O10)(OH,F)2)

Likely clear quartz crystal or glass-like gemstone

Quartz, silicon dioxide (SiO₂); exact identification is uncertain from the strongly magenta-lit image

Quartzite Pebble

Metamorphic Quartzite

Chert / Flint

Silicon dioxide (Microcrystalline Quartz, $SiO_2$)

Gemstone bead necklace (likely citrine or yellow quartz)

Quartz, SiO₂; precise identification is uncertain because the beads are blurred and metal settings obscure them

Green Slag Glass

Cullet (Amorphous Silicon Dioxide with impurities)

Yellow Quartz (Citrinated Quartz)

Silicon Dioxide (SiO2)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Citrine or Yellow Quartz

Silicon Dioxide (SiO2) with iron impurities

Quartz Pebble

Silicon Dioxide (SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Yellow quartz crystal (likely citrine)

Quartz, silicon dioxide (SiO₂), iron-colored variety commonly called citrine

Gemstone ring (stones not identifiable from image)

Unknown; the ring appears to contain two yellow stones and one colorless stone, possibly faceted gemstones or simulants

Smoky Quartz

Quartz (SiO2) with natural radiation