Mineral, Variety Of Chalcedony (Microcrystalline Quartz)

Black Obsidian

Volcanic Glass (predominantly SiO2, Silicon Dioxide)

Chert (and Flint)

Cryptocrystalline Quartz (SiO2)

Plume Agate

Silicon Dioxide (SiO2)

Chert (Flint variety)

Chert (SiO2)

Yellow Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (Pink Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Dendritic Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides

Yellow Jasper

Silicon Dioxide (SiO2) with goethite/iron oxide inclusions

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (specifically Flint or Common Opal/Chalcedony mix)

Microcrystalline Quartz (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Botryoidal Chalcedony

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz (Water-worn Pebble)

Quartz (Silicon Dioxide, SiO2)

Prasiolite and Quartz Crystal Cluster

Quartz (SiO2); Prasiolite is a variety of Quartz

Banded Agate Geode

Silicon Dioxide (SiO2)

Chert / Jasper and River Stones

Microcrystalline Quartz (SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Chalcedony (Pink/Gray variety)

Silicon Dioxide (SiO2)

Chert (Flint variety)

Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2

Chert (Common Opal/Jasper variety)

Microcrystalline Quartz (SiO2)

Quartzite Pebble

Quartzite (SiO2)

Chert (Quartz Variety)

Microcrystalline Silica (SiO2)

Chert (Quartz Variety)

Microcrystalline Silica (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Chert (and Flint variant)

Chert (SiO2)

Chert (with Quartz veins)

Microcrystalline quartz (SiO2)

Chert (specifically Red Chert or Jasper)

Microcrystalline Quartz (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Pink Jade (Dyed Quartzite)

Silicon Dioxide (SiO2) - primarily Quartzite or Quartz

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky/Common Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Blue Quartz (Blue Aventurine)

Silicon Dioxide (SiO2) with inclusions (typically crocidolite or dumortierite)

Chert (specifically a variety like Flint or River Jasper with Iron Oxidation)

Microcrystalline Quartz (SiO2)

Chert (Golden/Yellow Variety)

Microcrystalline Silica (SiO2)

Chert (Flint)

Microcrystalline Silica (SiO2)