Mineral (Cryptocrystalline Quartz)

Petrified Wood

Silicon Dioxide (SiO2) - Calcified / Silicified Wood

Dyed and polished agate heart

Microcrystalline quartz (chalcedony), SiO₂; likely druzy quartz inclusions

Breciated Chert

Brecciated Chert (Microcrystalline Quartz, SiO2)

Orbicular jasper

Siliceous microcrystalline quartz (chalcedony), commonly sold as ocean jasper

Jasper

Silicon Dioxide (Quartz variety, SiO2)

Polished pink chalcedony (likely pink agate/geode)

Microcrystalline quartz, SiO₂; chalcedony with iron-bearing inclusions and possible druzy quartz

Tumbled quartz-rich pebble, likely milky quartz with iron-oxide staining

Quartz (SiO₂), possibly with hematite/goethite inclusions or surface coating

Sardonyx Agate Sphere

Cryptocrystalline Quartz (SiO2) with iron oxide inclusions

Chalcedony

Chalcedony (SiO2)

Botryoidal Chalcedony (Agate)

Silicon Dioxide (SiO2)

Blue chalcedony (likely dyed or polished)

Microcrystalline quartz, SiO₂ (chalcedony variety)

Polished banded agate (probable)

Microcrystalline quartz, SiO₂ (chalcedony/agate)

Carnelian Agate (Flame Carving)

Chalcedony (Microcrystalline Quartz, SiO2)

Chalcedony (Agate/Common Opal blend)

Microcrystalline Quartz (SiO2)

Yellow Aventurine (Yellow Quartz)

Silicon Dioxide (SiO2) with inclusions of Muscovite or Mica

Iron-rich jasper (likely brecciated jasper)

Jasper, microcrystalline quartz (SiO₂) colored by hematite/goethite and iron oxides

Milky chalcedony cabochon ring

Chalcedony, microcrystalline quartz (SiO₂), likely white or pale agate variety

Honey-colored chalcedony (rough agate/chert)

Microcrystalline quartz, SiO₂; likely chalcedony with iron-oxide staining

Pink Dyed Agate (Pink Agate Slice)

Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz

Tumbled carnelian (orange chalcedony)

Carnelian, a microcrystalline variety of quartz (SiO₂)

Jasper or Chert with Quartz Vugs

Silicon Dioxide (SiO2)

Chert Pebble with Quartz Veins

Microcrystalline Quartz (SiO2)

Chert Pebble with Quartz Veins

Microcrystalline Quartz (SiO2)

Geode (Unopened)

Vug or Geode (primarily Silicon Dioxide, SiO2)

Chalcedony (Grey/White Agate)

Silicon Dioxide (SiO₂)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Chrysocolla (carved)

Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)

Polished leopard-skin jasper

Leopard-skin jasper; an opaque, microcrystalline quartz-rich rock, commonly with iron-oxide and volcanic/mineral inclusions

Jasper

Microcrystalline Quartz (SiO2)

Rounded banded agate pebble

Agate, microcrystalline quartz (SiO₂), commonly chalcedony with quartz bands

Banded agate (likely chalcedony)

Agate, microcrystalline quartz (SiO₂), commonly with chalcedony and quartz layers

Agate Geode

Silicon Dioxide (Chalcedony/Quartz), SiO2

Tumbled carnelian

Carnelian, a red-orange variety of microcrystalline chalcedony (SiO₂)

Red-and-white jasper/chalcedony pebble

Microcrystalline quartz (SiO₂), likely hematite- or iron-oxide-bearing jasper with white chalcedony/quartz

Polished pink banded agate

Microcrystalline quartz (chalcedony), SiO₂

Polished yellow jasper

Jasper, microcrystalline quartz (SiO₂), commonly containing iron oxides and other silicates

Tumbled banded agate

Microcrystalline quartz (chalcedony), SiO₂, with layered impurities

Tumbled yellow-orange jasper

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides

Banded agate (likely carnelian or fire-agate variety)

Microcrystalline quartz, SiO₂ (chalcedony with iron-oxide bands)

Agate (chalcedony), likely a cut nodule

Agate, a banded variety of microcrystalline quartz (SiO₂); associated iron oxides stain the rough outer matrix.

Chert (varieties include Flint or Jasper)

Chert (cryptocrystalline quartz; SiO₂)

Chalcedony

Silicon Dioxide (SiO2)