Mineraloid (Man Made Glass)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Gold-stained)

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with Chromium-rich Fuchsite mica

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Quartz (Tumbled/Polished Pebble)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (90%+ SiO2)

Quartzite Pebble

Quartzite (SiO2)

Cloudy Quartz (or Milky Quartz)

Silicon Dioxide (SiO2)

White Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartzite with Quartz Vein

Quartzite (primarily SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Chert (Jasper/River Stone)

Silicon dioxide (SiO2) - Microcrystalline quartz

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Obsidian

Obsidian (Volcanic Glass, SiO2 + impurity isotopes)

Quartz Vein in Host Rock (Breccia/Rhyolite)

Silicon Dioxide (SiO2) with matrix

Agate Nodule / Weathered Chert

SiO2 (Silicon Dioxide - Microcrystalline Quartz)

Milky Quartz

Silicon Dioxide (SiO2)

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Limestone

Calcium Carbonate (CaCO3)

Quartzite Pebbles

Quartzite (SiO2)

Quartz (Druzy)

Silicon Dioxide (SiO2)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Sandstone

Arenite

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Sandstone (Quartzose)

Arenite (SiO2 based)

Sandstone

Sandstone (Sedimentary rock composed of silicate grains)

Potassium Feldspar and Quartz

KAlSi3O8 (Potassium Feldspar) and SiO2 (Quartz)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Sandstone (Stream Pebble)

Arenite (primarily SiO2)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Quartz (with Iron staining)

Silicon Dioxide (SiO2)

Quartz Pebble (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (primarily SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Quartz Geode (Water-worn)

Silicon Dioxide (SiO2)