Synthetic Glass

Amethyst (Geode)

Silicon Dioxide with Iron impurities (SiO2)

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)

Amethyst

SiO2 (Silicon Dioxide with Iron impurities)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Quartz (Microcrystalline/Chert)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Red Quartzite

Quartzite (primarily SiO2)

Orthoclase Feldspar

KAlSi3O8 (Potassium aluminum silicate)

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Quartz (Milky or Smoky Quartz)

Silicon Dioxide (SiO2)

Quartz with Tourmaline and Iron Staining

Silicon Dioxide (SiO2) with Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with impurities)

Mahogany Obsidian

Obsidian (Volcanic Glass) with Hematite/Magnetite inclusions

Rose Quartz

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

Rose Quartz

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

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2) with iron oxide impurities

Smoky Quartz

Silicon Dioxide (SiO2)

Granitic Quartz or Pegmatite

Quartz with Orthoclase Feldspar (SiO2 + KAlSi3O8)

White Quartz (Mushroom Carving)

Quartz (Silicon Dioxide - SiO2)

Rhyolite

Rhyolite (High-silica volcanic rock)

Quartzite

Quartzite (SiO2)

Quartz (Milky or Cloudy variety)

Silicon Dioxide (SiO2)

Chert (varietal Flint)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz / Chert

Silicon Dioxide (SiO2)

Mineral / Sedimentary

Banded Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Chert (with Iron Staining)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO₂)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Green Fluorite

Calcium Fluoride (CaF2)