Mineral (Chalcedony)

Green Jasper

Silicon Dioxide (SiO2) with impurities

Green Jasper with Quartz veins

Jasper (Silicon Dioxide, SiO2)

Amethyst (Agate/Chalcedony variety)

Silicon Dioxide (SiO2) with iron impurities

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions

Red Jasper

Jasper (a variety of Chalcedony, SiO₂ with iron oxide inclusions)

Geode (Unbroken)

Silicon Dioxide (SiO2) usually as Microcrystalline Quartz or Chalcedony

Yellow Jasper

Chalcedony (SiO2) with Goethite/Iron oxide inclusions

Agatized Petrified Wood

Silicon Dioxide (SiO2) - Chalcedony pseudomorph after Wood

Chalcedony Geode Fragment (Botryoidal)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Jasper

Silicon dioxide (SiO2) with impurities

Banded Calcite (often sold as 'Mexican Onyx' or 'Calcite Onyx')

Calcite (Calcium Carbonate, CaCO3)

Jasper

Silicon dioxide (SiO2)

Jasper

Jasper (Silicon Dioxide, SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Ferric Iron inclusions

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper (possibly Orbicular)

Silicon Dioxide (SiO2) with iron oxide inclusions

Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides

Dalmation Jasper (Dalmation Stone)

Perthitic feldspar-quartz-amphibole rock

Petrified Wood

Silicified wood (primarily Quartz/Chalcedony, SiO2)

Chert Geode or Nodule

Microcrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Lake Superior Agate

Chalcedony (cryptocrystalline Quartz, SiO2) with iron oxide inclusions

Agate Slices and Clear Quartz Points

Agate (SiO2 Chalcedony) and Clear Quartz (SiO2 Crystalline)

Carnelian

Chalcedony (Silicon Dioxide, SiO2 with Iron Oxide impurities)

Carnelian Agate

Chalcedony (Silicon Dioxide, SiO2) with Iron Oxide impurities

Tiffany Stone

Bertrandite (with Fluorite, Opal, and Chalcedony), Be4Si2O7(OH)2

Carnelian Agate

Chalcedony (Silicon Dioxide, SiO2) with Iron Oxide impurities

Carnelian

Carnelian (Varietal of Chalcedony, SiO2 with Iron Oxide impurities)

Jasper

Silicon Dioxide (SiO2) - a variety of Chalcedony (Cryptocrystalline Quartz)

Carnelian

Carnelian (a variety of Chalcedony, SiO2) colored by iron oxide

Jasper

Jasper (Silicon Dioxide, SiO2)

Blue Lace Agate

Silicon Dioxide (SiO2) - Chalcedony / Quartz

Petrified Wood

Silicified Wood (primarily Chalcedony or Quartz, SiO2)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with goethite or iron oxide inclusions

Carnelian

Carnelian (a variety of Chalcedony, which is a microcrystalline quartz, SiO₂)

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite and Quartz inclusions

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Jasper (Iron-rich)

Silicon Dioxide (SiO2) with Fe2O3 (Hematite) impurities

Jasper (Green Jasper/Chert)

Silicon Dioxide (SiO2)

Picture Jasper

Silicon Dioxide (SiO2)