Manufactured Glass

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Clastic sedimentary rock (primarily quartz arenite)

Sandstone

Arenite (primarily Quartz, SiO2)

Sandstone

Sedimentary rock composed mainly of sand-sized minerals or rock grains

Quartzite

Metamorphic Quartz Rock (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (Clastic Sedimentary Rock)

Obsidian (likely black volcanic glass)

Obsidian; naturally occurring rhyolitic glass, primarily SiO₂

Sandstone

Arenite (SiO2 primarily)

Sandstone

Clastic sedimentary rock (quartz arenite)

Quartz Crystal (Amethyst)

Silicon Dioxide (SiO2)

Quartzite

Metamorphic Quartzite

Tumbled obsidian

Volcanic glass; chiefly SiO₂, noncrystalline

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz pebble

Silicon Dioxide (SiO2)

Sandstone

Clastic Sedimentary Rock

Clear Quartz

Silicon Dioxide (SiO2)

Likely tektite (impact glass), possibly Muong Nong-type indochinite

Natural impact glass; silica-rich glass, typically ~70–80% SiO₂

Quartz (Smoky/Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone

Clastic sedimentary rock (Quartz arenite)

Quartzite

Metamorphic Quartzite (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz / Quartz Geode Fragment

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Sedimentary Rock (Quartz Arenite)

Sandstone

Clastic sedimentary rock (Quartz arenite / Arkose)

Quartz (Smoky or Citrine variety)

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based)

Quartzite Pebble

Quartzite (SiO2)

Limestone (containing Fossil Mold)

Sedimentary Calcium Carbonate (CaCO3)

Quartzite Pebble

Quartzite (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Iron-stained Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Sandstone (Quartzose)

Arenite (SiO2 based)