Manufactured Glass

Sandstone

Sedimentary Rock (Quartz arenite)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Sandstone (SiO2 rich)

Quartz on Matrix

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based)

Clear Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (mostly SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartzite

Metamorphic Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphosed Quartz-rich Sandstone (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Quartzite

Quartzite (SiO2)

Sandstone

Arenite (SiO2 based)

Quartzite Pebble

Quartzite (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Grain / Sandstone Fragment

Silicon Dioxide (SiO2)

Clear Quartz (Tumbled)

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Sandstone

Arenite (SiO2 primarily)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Orthoclase Feldspar

KAlSi3O8 (Potassium aluminum silicate)

Limestone Pebble

Sedimentary Calcium Carbonate (CaCO3)

Quartzite Cobble

Metamorphosed Sandstone (SiO2)

Sandstone (Red Sandstone)

Arenite (SiO2 based with Fe2O3 staining)

Milky Quartz with Chlorite/Amphibite Inclusions

Silicon Dioxide (SiO2) with various mineral inclusions

Milky Quartz

Silicon Dioxide (SiO2)

Quartz / Quartzite

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Sandstone (likely Arkosic or Quartzose)

Sandstone (SiO2 dominated)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 primarily)

White Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite

Quartzite (containing SiO2)

Clear Quartz

Silicon dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)