Manufactured Glass (Simulant)

Quartz

Silicon Dioxide (SiO2)

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

Ferrous Slag

Fused calcium-iron silicates (Industrial Slag)

Milky Quartz (Stained with Iron)

Silicon Dioxide (SiO2)

Milky Quartz with Mica inclusions

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky Quartz / Greenish Quartz)

SiO2 (Silicon Dioxide)

Quartzite Pebbles

Quartzite (SiO2)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Sandstone

Arenite

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Sandstone (Quartzose)

Arenite (SiO2 based)

Sandstone

Sandstone (Sedimentary rock composed of silicate grains)

Potassium Feldspar and Quartz

KAlSi3O8 (Potassium Feldspar) and SiO2 (Quartz)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Sandstone (Stream Pebble)

Arenite (primarily SiO2)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Quartz (with Iron staining)

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based)

Quartzite

Quartzite (SiO2)

Sandstone

Arenite (primarily SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Quartz on Matrix

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 predominantly)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Quartz in Matrix (possibly with Biotite or Hornblende)

Quartz (Silicon Dioxide, SiO2) in Granitic Matrix

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz / Common Opal

Silicon Dioxide (SiO2)

Quartz Pebble (Chert/Chalcedony)

Silicon Dioxide (SiO2)

Green Glass Slag

Amorphous Silicon Dioxide (SiO2) with metal oxide impurities

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)