Synthetic Glass

Smoky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone (Quartzose Sandstone)

Arenite (SiO2)

Red Sandstone

Arenite (with Iron Oxide pigmentation)

Sedimentary

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone

Arenite (primarily Quartz, SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Pegmatite

Coarse-grained Igneous Rock (Granitic Pegmatite)

igneous

Sandstone

Arenite (primarily Quartz, SiO2)

Sandstone

Arenite (primarily SiO2)

Milk Quartz (White Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartzite with Iron Banding

Metamorphosed Quartz-rich Sandstone (SiO2 with Fe2O3 inclusions)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (specifically Milky or Rose Quartz variant)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Rose Quartz

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

Milky Quartz

Quartz (SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Quartz Crystal (specifically Rock Crystal)

Silicon Dioxide (SiO2)

Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Igneous

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Quartz (likely Herkimer Diamond style)

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Chert (Green variety)

Chert (Silicon Dioxide, SiO2)

Quartz (Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Golden Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)