Manufactured Glass (Simulant)

Quartzite

Quartzite (primarily SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Diamond

Diamond (pure carbon; C)

Quartzite

Quartzite (SiO2)

Quartzite (River Stone)

Quartzite (mainly SiO2 with iron oxide staining)

Quartz (Milky or Grainy Variety)

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Quartzite

Quartzite (mostly SiO2)

Sandstone (Quartzose Sandstone)

Arenite

Sandstone (likely Quartzose Sandstone)

Arenite (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite (SiO2 primarily)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky/Clear Variety)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Quartz (specifically Clear Quartz with iron/hematite staining)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Lepidolite

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

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

Slag (Industrial Glass Slag)

Amorphous Silicate Glass (often containing Al, Ca, Mg, and Ti oxides)

Sandstone (specifically Red Sandstone)

Arenite (primarily Quartz, SiO2)

Sandstone

Arenite (primarily SiO2)

Milky Quartz (Tumbled Pebble)

Silicon Dioxide (SiO2)

Red Sandstone

Clastic Terrigenous Sedimentary Rock (typically Hematitic Quartz Arenite or Arkose)

Quartz (Specifically Clear to Smoky Quartz point)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Lepidolite

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

Sandstone

Clastic sedimentary rock (primarily SiO2)

White Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone

Arenite (Sedimentary Rock)

Quartzite Pebble

Quartzite (primarily SiO2)

Feldspar (Orthoclase)

Potassium Feldspar (KAlSi3O8)