Synthetic Glass

Quartzite

Quartzite (primarily SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Red Quartzite (Ferruginous Quartz)

Quartzite (SiO2 with Fe2O3 inclusions)

Chert

Microcrystalline Quartz (SiO2)

Green Aventurine

Quartz variant (SiO2) with Fuchsite inclusions

Mica Schist (with Muscovite)

Muscovite/Quartz Schist (KAl2(AlSi3O10)(OH)2)

Quartzite

Quartzite

Citrine (tumbled)

Silicon dioxide, SiO2

Quartz Mineral

Silicon Dioxide (SiO2)

Jasper

Silicon Dioxide (Microcrystalline Quartz), SiO2

White Quartz

Silicon Dioxide (SiO2)

Quartz with Inclusions

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite

Yellow Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Chert/Jasper

Microcrystalline Quartz (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Chert (Jasper/Agate variety)

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (SiO2)

Chert with Quartz Vein

Silicon dioxide (SiO2)

Granite / Quartz Vein Rock

Granitoid with Quartz (SiO2)

Quartz (Gravel Pebble)

Silicon Dioxide (SiO2)

Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz with impurities or Host Rock

SiO2 (Silicon Dioxide) with mixed silicates

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.

SiO2 (Silicon Dioxide)

Quartz (Citrine or Iron-Stained)

Silicon Dioxide (SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Silicon dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone (Limonitic/Arkose)

Sandstone (primarily SiO2 with FeO(OH)·nH2O)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Druzy)

Silicon Dioxide (SiO2)