Man Made Glass

Sandstone

Arenite (SiO2 principal component)

Sandstone

Arenite (SiO2 based)

Red Sandstone

Arenite (Ferruginous Sandstone)

Quartzite (Milky or Cloudy Quartz variant)

Silicon Dioxide (SiO2)

Flint (Chert)

Silicon dioxide (SiO2) - Cryptocrystalline Quartz

Quartzite Pebble

Quartzite (primarily SiO2)

Sandstone with Hematite staining

Arenite with Fe2O3 inclusions

Quartzite

Quartzite (mainly SiO2)

Sandstone nugget

Arenite (primarily Quartz SiO2)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Sandstone

Arenite (SiO2 primarily)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Sandstone

Arenite

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite (SiO2 based)

Milky Quartz

Silicon Dioxide (SiO2)

Calcite in Matrix

Calcium Carbonate (CaCO3) on Sedimentary Host Rock

Quartzite

Quartzite (SiO2)

Sandstone

Arenite

Clear Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Red/Brown)

Arenite (composed primarily of SiO2)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 primarily)

Sandstone (likely Arkosic or Quartzose)

Sandstone (SiO2 dominated)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based)

Sandstone (likely Red/Brown Sandstone)

Arenite (SiO2 based)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone

Arenite (SiO2 based)

Quartz

Silicon Dioxide (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Red Sandstone

Quartz Arenite (with Iron Oxide)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite

Sandstone (Quartz Arenite)

Sandstone (SiO2 with possible mineral cements)