Glass

Red/pink faceted gemstone, likely synthetic ruby or red glass

Corundum (Al₂O₃) if ruby; identity cannot be confirmed visually

Rounded quartz-rich pebble, likely quartzite

Quartzite (microcrystalline quartz, SiO₂), possibly quartz-rich sandstone

Blue-green glassy mineral specimen, likely aquamarine or pale fluorite

Tentatively beryl (Be₃Al₂Si₆O₁₈), aquamarine variety; identification is uncertain from the photograph

Blue glass-like beaded bracelet (material uncertain)

Possibly dyed blue agate or another blue stone; the image does not allow reliable mineral identification

Milky Quartz

Silicon Dioxide (SiO2)

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

Quartz, silicon dioxide (SiO₂), yellow coloration from iron impurities

Chert (Flint)

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Pink Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Chert or flint fragment

Microcrystalline quartz (SiO₂), possibly iron-stained chert

Chert (Flint)

Microcrystalline quartz (SiO2)

Chalcedony

Cryptocrystalline Quartz (SiO2)

Chert (Cherty Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Brown Chert

Cryptocrystalline Silica (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Citrine

Citrine (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Possible sea glass (naturally frosted glass), not a confirmed geological specimen

Man-made silicate glass; composition varies, commonly soda-lime glass

Amethyst cabochon

Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation

Small green gemstone, possibly peridot or glass imitation

Unidentified; peridot is gem-quality olivine, (Mg,Fe)₂SiO₄

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Red heart-shaped glass bead in a wire-wrapped jewelry charm

Likely colored glass (amorphous silica-based material); the image does not show an identifiable geological specimen

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Tumbled green aventurine (probable)

Quartz variety: aventurine quartz, SiO₂, colored commonly by fuchsite mica

Tumbled golden-brown stone, likely sandstone or weathered iron-rich quartzite

Probable ferruginous sandstone; exact identification is uncertain from the image

Polished carnelian agate (likely dyed or heat-treated)

Microcrystalline quartz, chiefly chalcedony; SiO₂

Milky quartz (rough quartz fragment)

Quartz, silicon dioxide (SiO₂)

Rounded quartz-rich pebble

Chert or quartzite pebble (tentative; mostly microcrystalline quartz, SiO₂)

Weathered quartz-rich rock, possibly chert or milky quartz

Mostly microcrystalline or crystalline quartz (SiO₂), identification uncertain from photograph

Blue Goldstone

Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)

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

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

Rose Quartz

Silicon dioxide (SiO2) with trace impurities of titanium, iron, or manganese

Raw Citrine Quartz

Silicon Dioxide (SiO2)

Rose Quartz

Quartz (Silicon Dioxide) - SiO2

Milky quartz

Quartz (silicon dioxide, SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Milky quartz

Quartz (SiO₂)

Tumbled pink quartz (likely rose quartz)

Rose quartz, quartz (SiO₂), commonly colored by trace elements and microscopic inclusions

Tumbled smoky quartz

Quartz, SiO₂; smoky variety colored by irradiation-induced defects