Synthetic Glass

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Microcrystalline Gravel)

Silicon Dioxide (SiO2)

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Quartz (Granular)

Silicon Dioxide (SiO2)

Quartz Pebble (Grit)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Feldspar (Orthoclase)

Potassium Feldspar (KAlSi3O8)

Milky Quartz with Mica inclusions

Quartz (Silicon Dioxide, SiO2)

Milky Quartz (Stained with Iron)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (White/Milky)

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite River Rock

Quartzite (primarily SiO2)

Quartzite Pebbles

Quartzite (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Snowflake Obsidian

Volcanic glass containing Spherulites of Cristobalite (SiO2)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Red Quartzite

Quartzite (primarily SiO2 with hematite impurities)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Chert (often called Flint)

Chert (Microcrystalline Quartz, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Obsidian

Obsidian (Volcanic Glass, SiO2 + impurity isotopes)

Obsidian (black volcanic glass)

Obsidian; primarily amorphous SiO₂-rich rhyolitic glass

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz Vein / Quartzite

Silicon Dioxide (SiO2)

Tumbled Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz Fragment

Silicon Dioxide (SiO2)