Synthetic (Glass)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Quartz / Clear Quartz

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (Fe2O3 stained)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Water-worn pebble)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone

Arenite (primarily SiO2)

Milky Quartz (with potential inclusion of feldspar)

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphic Quartz (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Quartzite

Quartzite (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Granitic Pegmatite (River Rock specimen)

Granite / Pegmatite (composed of SiO2, KAlSi3O8, and NaAlSi3O8)

Limestone

Calcium Carbonate (CaCO3)

Quartz (specifically Milky/Yellow Quartz)

Silicon Dioxide (SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Sandstone (Red Sandstone / River Stone)

Arenite (composed primarily of Quartz, SiO2, with Iron Oxide cementation)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 staining)

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Sandstone (likely Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Sandstone

Arenite (primarily SiO2)

Quartz Geode (with possible Manganese or Goethite coating)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartzite (with Metamorphic Foliation)

Quartzite (Recrystallized SiO2)

Sandstone (likely Arkosic or Lithic Sandstone)

Arenite (SiO2 based with mineral inclusions)

Sandstone

Arenite

Clear/White Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartzite Cobble

Quartzite (primarily SiO2)

Quartz (Rose or Clear variety)

Silicon Dioxide (SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)