Tektite (Natural Glass)

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities and natural irradiation

Tumbled blue chalcedony (likely common blue quartz)

Microcrystalline quartz, SiO₂; chalcedony variety

Orange Quartzite

Quartzite (primarily SiO2 with Hematite impurities)

Amethyst

Amethyst (Silicon Dioxide with Iron impurities), SiO2

Smoky Quartz

SiO2 (Silicon Dioxide)

Smoky Quartz (Chlorite Inclusions)

Silicon Dioxide (SiO2) with trace Aluminum and Natural Irradiation

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Amber (specifically Cherry Amber)

Succinite (with the chemical formula C10H16O)

Ruby

Corundum (Al2O3 with Chromium trace)

River Stone (likely Mudstone or Siltstone)

Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)

Flint or chert fragment

Microcrystalline quartz (SiO₂), likely flint/chert

Pink Quartz (likely dyed)

Silicon Dioxide (SiO2)

Amethyst

Silicon Dioxide (SiO2) with trace Iron (Fe) impurities

Emerald in Matrix

Beryl (Be3Al2(SiO3)6) embedded in schist or pegmatite host rock

Yellow Quartz (Citrine/Yellow Chalcedony)

Silicon Dioxide (SiO2)

Citrine Quartz

Silicon Dioxide (SiO2) - Ferric Iron impurities

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Tumbled banded calcite (often sold as “onyx” or green onyx)

Calcite, CaCO₃; commonly banded cave/travertine calcite

Golden Healer Quartz

Ferruginous Quartz (SiO2 with Fe2O3 inclusions)

Pearl

Pearl; primarily aragonite (CaCO₃) in nacre

Amethyst (likely rough or cleaved fragment)

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

Jadeite and Mixed Gemstones (Ruby, Sapphire, Emerald)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Amethyst (Rough Quartz)

Silicon Dioxide (SiO2) with iron impurities

Tumbled brown stone, likely jasper or iron-stained quartz

Microcrystalline quartz (SiO₂), possibly chalcedony/jasper with iron-oxide inclusions

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Smoky quartz crystal/rough fragment

Quartz (SiO₂), likely smoky quartz

Fluorite Octahedron

Calcium Fluoride (CaF2)

Milky quartz (massive quartz)

Quartz, silicon dioxide (SiO₂)

Pink quartz bead necklace/strand

Quartz, silicon dioxide (SiO₂), likely rose quartz or pink chalcedony; exact identification is uncertain from the image

Chert or flint

Microcrystalline quartz (SiO₂), likely chalcedony-rich chert

Yellow Quartz Pebble (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Green cabochon gemstone pendant

Indeterminate; likely dyed green turquoise, chrysoprase, or opaque beryl set with blue/clear accent stones

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky quartz (likely vein quartz)

Quartz, silicon dioxide (SiO₂)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Obsidian (Apache Tear)

Obsidian / Amorphous Volcanic Glass (main component: SiO2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3/FeO(OH)) inclusions

Quartzite Pebble

Quartzite (SiO2 with minor impurities)

Tumbled orange chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; iron-bearing variety commonly termed carnelian

Red jasper pebble

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides