Mineral (Man Made Glass)

Obsidian

Volcanic Glass (Amorphous Silica)

Black Obsidian with white veins

Volcanic Glass (70–75% SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Bull Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz

Silicon dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Granite (Weathered)

Phaneritic Felsic Igneous Rock

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Peach Aventurine

Quartz variety (SiO2 + Hematite/Goethite inclusions)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Clear Quartz

Crystalline Silicon Dioxide (SiO2)

Lepidolite

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

Obsidian (specifically Mahogany Obsidian)

Volcanic glass (high silica content, SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 staining)

Fulgurite

Fulgurite (Lechatelierite), amorphous SiO2

Milky Quartz

Silicon Dioxide (SiO2)

Rose Quartz

SiO2 (Silicon Dioxide with trace inclusions of dumortierite)

Green Quartzite

Quartzite (primarily SiO2 with trace impurities)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with impurities)

Quartzite

Hydrothermal Quartz or Quartzite (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Arenite (composed primarily of Quartz, SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartzite with inclusions

Metamorphic Rock (Mainly SiO2)

Rose Quartz

Silicon Dioxide (SiO2)