Manufactured Glass

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2)

Limestone

Calcium Carbonate (CaCO3)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Clear Quartz

SiO2 (Silicon Dioxide)

Clear Quartz crystals on a Matrix base (Geode fragment)

Silicon Dioxide (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Quartz Crystal

Silicon Dioxide (SiO2)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

Chert / Flint

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Smoky or Impure Variety)

Silicon Dioxide (SiO2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartzite Pebbles

Quartzite (SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Bull Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Iron-stained Quartzite

Recrystallized Quartz (SiO2) with Hematite/Limonite staining

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (SiO2 major component)

Sandstone

Arenite (composed primarily of SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartzite River Rock

Quartzite (primarily SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Quartz (Common or Milky)

Silicon Dioxide (SiO2)

Sandstone (Calcareous or Ferruginous)

Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (Quartzite Pebble)

Arenite (primarily SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Feldspar

Potassium Feldspar (KAlSi3O8)

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone

Arenite (Sedimentary rock composed of sand-sized minerals or rock grains)

Sandstone

Arenite (primarily SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone

Arenite

Clear Quartz

Silicon Dioxide (SiO2)