Manufactured Glass (Simulant)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (mostly SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartz (Variety: Rock Crystal Cluster)

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Quartz (Smoky or Impure Variety)

Silicon Dioxide (SiO2)

Sandstone

Sedimentary Rock (Quartz Arenite)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Sedimentary Rock (Quartz arenite / Lithic sandstone)

Quartzite

Metamorphic Quartzite (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Quartz

Silicon Dioxide (SiO2)

Sandstone

Sedimentary Clastic Rock (Quartz Arenite)

Sandstone

Clastic Sedimentary Rock

Quartz Pebble

Silicon Dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Sandstone

Sedimentary Rock (Quartzose Sandstone)

Quartz

Silicon Dioxide (SiO2)

Lepidolite

K(Li,Al)3(Si,Al)4O10(F,OH)2

Quartz Pebble

Silicon dioxide (SiO2)

Sandstone

Clastic Sedimentary Rock

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Sandstone (SiO2 dominant)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Arenite (predominantly SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Milky Quartz

Silicon Dioxide (SiO2)

Yellow Quartzite (River Cobble)

Quartzite (SiO2 with iron oxide staining)

Quartz Pebble

Silicon Dioxide (SiO2)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Sandstone

Arenite (Silicon Dioxide with various mineral cements)

Milky Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Sandstone (likely Graywacke or Arkose)

Arenite

Sandstone

Arenite

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Red Sandstone

Arenite (Ferruginous Sandstone)

Clear Quartz

Silicon Dioxide (SiO2)

Sandstone (Micaceous)

Clastic Sedimentary Rock - Micaceous Litharenite (SiO2 principal)