Mineral And Glass

Tumbled amethyst

Quartz, purple variety; SiO₂

Clear Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky quartz (likely quartz-rich rock)

Quartz, silicon dioxide (SiO₂)

Obsidian

Volcanic glass

Quartz

Silicon Dioxide (SiO2)

Amethyst

Quartz (Silicon Dioxide, SiO2)

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Clear quartz crystal (likely quartz point or polished quartz)

Quartz, silicon dioxide (SiO₂)

Black tumbled stone, possibly obsidian

Obsidian (volcanic glass; predominantly SiO₂), identification uncertain from image

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

Quartz / Milky Quartz

Silicon Dioxide (SiO2)

Small white rounded mineral grain, likely quartz

Quartz (SiO₂), probable milky or vein quartz

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2)

Chrysocolla and Malachite Beads

Hydrated copper silicates (Chrysocolla) and Copper carbonate hydroxide (Malachite)

Likely polished/tumbled dark mineral or glassy rock fragment

Indeterminate from image; possibly hornblende, schorl tourmaline, or obsidian

Tumbled green aventurine (likely)

Quartz variety, SiO₂, colored by fuchsite or other chromium-bearing mica

Orange chalcedony / carnelian with drusy quartz

Microcrystalline quartz, SiO₂ (chalcedony; iron-colored variety often called carnelian), with possible calcite or quartz matrix

Mica (Biotite or Phlogopite variety)

Phyllosilicate (complex mineral formula involving K, Mg, Fe, Al, Si, and O)

Quartz

Silicon Dioxide (SiO2)

Mixed tumbled stones, likely rose quartz and purple quartz/amethyst

Quartz (SiO₂), including amethyst and probable rose quartz; exact identification is uncertain from the blurred image

Milky Quartz

Silicon Dioxide (SiO2)

Chert (Flint/Jasper)

Silicon Dioxide (SiO2)

Weathered quartz-rich rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica or iron-oxide impurities

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Obsidian

Obsidian (volcanic glass; primarily SiO2)

Yellow chalcedony (likely citrine-like quartz)

Cryptocrystalline quartz, SiO₂; possibly iron-stained chalcedony or pale citrine

Tumbled translucent quartz or chalcedony

Silicon dioxide (SiO₂), likely quartz/chalcedony

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(F,OH)2

Muscovite

Muscovite, KAl2(AlSi3O10)(OH)2

Quartz (Smoky/Grey variety)

Silicon Dioxide (SiO2)

Granitic Pegmatite with Muscovite Mica

Pegmatite (containing KAl2(AlSi3O10)(OH)2)

Quartz-rich rock, likely milky quartz or quartz vein fragment

Quartz (silicon dioxide, SiO₂), possibly with minor feldspar or calcite

Green-speckled igneous rock, likely epidote-bearing basalt or serpentinite

Tentatively epidote-bearing basalt (compositionally uncertain from the image)

Quartz (Milky/Crystalline variety)

Silicon Dioxide (SiO2)

Tumbled Rose Quartz

Quartz (SiO2)

Honey-colored quartz-rich stone, possibly chert or chalcedony

Microcrystalline silica (SiO₂), identification uncertain from photograph

Yellow Quartz (Citrinated Quartz)

Silicon Dioxide (SiO2)

Tumbled yellow translucent mineral, likely citrine or honey calcite

Citrine: quartz, SiO₂; honey calcite: calcium carbonate, CaCO₃

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2) with Limonite/Goethite