Mineral And Glass

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Faceted Crystal)

Silicon Dioxide (SiO2)

Polished red jasper or mahogany obsidian (likely jasper)

Microcrystalline quartz, SiO₂, with iron-oxide inclusions

Quartz (Milky or Rough Quartz)

Silicon Dioxide (SiO2)

Snowflake Obsidian

Spherulitic Volcanic Glass (SiO2)

Amethyst (Tumbled Quarz)

Silicon Dioxide (SiO2) with iron impurities

Goldstone (likely blue-free synthetic goldstone pendant)

Synthetic aventurine glass; silica glass with dispersed metallic copper crystals

Milky quartz

Quartz, silicon dioxide (SiO₂)

Quartz Crystal

Silicon Dioxide (SiO2)

Quartz Crystal (Amethyst)

Silicon Dioxide (SiO2)

Amethyst

Purple quartz (SiO₂), colored mainly by iron impurities and irradiation

Tumbled amethyst

Quartz, SiO₂; purple variety colored mainly by iron-related defects and irradiation

Polished black obsidian pyramid/block

Obsidian — natural volcanic glass, chiefly rhyolitic silica (approximately 70–75% SiO₂)

Quartz

Silicon Dioxide (SiO2)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Likely weathered quartz or feldspar grain

Uncertain; possibly quartz (SiO₂) or a feldspar mineral

Iron-stained Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Limonite/Goethite) inclusions

Opalite

Synthetic opalescent glass

Likely weathered quartz-bearing rock fragment

Provisional identification: quartz-rich sandstone or microcrystalline quartz (SiO₂)

Milky Quartz (Ferruginous)

Silicon Dioxide (SiO2)

Beaded gemstone bracelet

Indeterminate; likely small polished mineral beads, possibly turquoise or dyed stone, with metal and glass components

Tumbled quartz-rich stone, possibly smoky quartz or chert

Uncertain; likely microcrystalline quartz, SiO₂

Weathered quartz-rich rock, possibly milky quartz or quartzite

Quartz (SiO₂), potentially quartzite if metamorphic

Tumbled honey-yellow quartz/chalcedony, possibly dyed

Microcrystalline quartz (SiO₂), likely chalcedony or quartz with iron-oxide coloration

Labradorite pendant

Labradorite, a plagioclase feldspar: (Ca,Na)(Al,Si)₄O₈

Raw quartz crystal cluster (likely chalcedony/quartz)

Quartz, silicon dioxide (SiO₂)

Quartz

Silicon Dioxide (SiO2)

Lepidolite

K(Li,Al)3(Si,Al)4O10(F,OH)2

Quartz

Silicon Dioxide (SiO2)

Blue opalite (often sold as synthetic opal)

Opalite glass; amorphous hydrated silica if natural opal (SiO₂·nH₂O)

Snowflake Obsidian

Volcanic glass containing Cristobalite (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz with iron staining

Silicon dioxide (SiO2)

Lepidolite

K(Li,Al)3(Si,Al)4O10(F,OH)2

Clear quartz crystal pendant

Quartz (silicon dioxide, SiO₂)

Amethyst geode

Quartz, SiO₂; purple variety amethyst, commonly a drusy-lined geode

Rose quartz

Quartz, silicon dioxide (SiO₂), pink variety

Green beryl (likely heliodor)

Beryl, Be₃Al₂Si₆O₁₈; yellow-green varieties are heliodor or golden beryl