Manufactured Glass (Simulant)

Quartz Grain / Sandstone Fragment

Silicon Dioxide (SiO2)

Clear Quartz (Tumbled)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Sandstone

Arenite (SiO2 based)

Quartzite Pebble

Quartzite (SiO2)

Quartzite Cobble

Metamorphosed Sandstone (SiO2)

Orthoclase Feldspar

KAlSi3O8 (Potassium aluminum silicate)

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)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz / Quartzite

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Sandstone

Arenite (SiO2 predominantly)

Clear Quartz

Silicon Dioxide (SiO2)

White Quartz Pebble

Silicon Dioxide (SiO2)

Clear Quartz

Silicon dioxide (SiO2)

Sandstone

Arenite (SiO2 primarily)

Sandstone (Quartzite Pebble)

Arenite (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz / Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Sandstone (likely Arkosic or Quartzose)

Sandstone (SiO2 dominated)

Sandstone

Arenite (SiO2 based)

Quartzite

Quartzite (containing SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphic Quartz (SiO2)

Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based)

Sandstone (Ferruginous)

Sandstone (primarily SiO2 with iron oxide cement Fe2O3)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (SiO2 based)

Quartzite Pebble

Quartzite (chiefly SiO2)

Sandstone

Arenite (primarily SiO2)

Quartz (Clear/White)

Silicon Dioxide (SiO2)

Sandstone

Arenite

Quartz

Silicon Dioxide (SiO2)

Quartz (Citrine or Iron-Stained)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)