Manufactured Glass (Simulant)

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)

Slag (Industrial Glass/Metal)

Ferrous slag or Glassy silicate byproduct

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

Chert / Flint

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartz (Smoky or Impure Variety)

Silicon Dioxide (SiO2)

Quartzite Pebbles

Quartzite (SiO2)

Quartz pebble

Silicon Dioxide (SiO2)

Iron-stained Quartzite

Recrystallized Quartz (SiO2) with Hematite/Limonite staining

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (SiO2 major component)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Bull Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Sandstone

Arenite (composed primarily of SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Quartz (Common or Milky)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (Quartzite Pebble)

Arenite (primarily SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone (Calcareous or Ferruginous)

Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)

Quartzite River Rock

Quartzite (primarily SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Feldspar

Potassium Feldspar (KAlSi3O8)

Sandstone

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

Sandstone

Arenite

Sandstone

Arenite (primarily SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 principal component)

Sandstone (Quartzose)

Arenite (primarily SiO2)