Glass

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Quartz / Quartz Geode Fragment

Silicon Dioxide (SiO2)

Sandstone (Yellow/Siltstone variant)

Arenite (SiO2 primarily)

Milky Quartz with inclusions

Quartz (Silicon Dioxide, SiO2)

Quartzite River Cobble

Quartzite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Red Sandstone

Arenite (Iron-rich)

Sandstone (Quartzose Sandstone Pebble)

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (SiO2 principal)

Sandstone (Quartz Arenite)

Clastic Sedimentary Rock - Quartz Arenite

Sandstone

Arenite

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Quartzite (Quartz Vein)

SiO2 (Silicon Dioxide)

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Massive Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone

Arenite (SiO2 based)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (with Lichen)

Arenite (composed primarily of SiO2)

Quartzite Pebble

Quartzite (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone

Arenite (primarily SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Fluorite

Calcium Fluoride (CaF2)

Sandstone

Arenite (SiO2 based)

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Sandstone

Arenite (with iron oxide cement)

Sandstone

Arenite (SiO2 based)

Quartz (River Cobble)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2 - Silicon Dioxide)

Quartzite

SiO2 (Metamorphosed Sandstone)

Sandstone

Arenite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Sandstone (Weathered Cobble)

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite

Quartzite Pebble

Quartzite (SiO2)

Sandstone

Arenite (primarily SiO2 with trace Fe2O3)

Sandstone

Arenite (primarily SiO2)