Varieties/Types:
- Agate - A banded variety of Chalcedony.
- Iris Agate - An iridescent variety of Agate.
- Onyx - A monochromatic Agate with black and white banding.
- Sardonyx - A monochromatic Agate with red/brown and either black or white banding.
- Binghamite - Chatoyant Chalcedony with fibres of hematite/goethite.
- Bloodstone - A dark green/greenish-blue Chalcedony with small red blood-like spots.
- Carnelian - A red to orange variety of Chalcedony.
- Chrome-Chalcedony - Emerald green Chalcedony, colored by chromium.
- Chrysocolla Chalcedony
- Chrysoprase - A green Chalcedony coloured by inclusions of Ni minerals.
- Dendritic Agate - A chalcedony containing contrasting branching, or dendritic, mineral inclusions.
- Moss Agate - A translucent chalcedony containing green strands of chlorite.
- Fire Agate - A variety of Agate containing iridescent spheroids of limonite.
- Jasper - Jasper is a dense, opaque, microcrystalline variety of Chalcedony.
- Dallasite - A variety of Jasper from Vancouver Island, British Columbia, Canada.
- Orbicular Jasper - Jasper containing numerous spherical inclusions.
- Myrickite
- Petrified Wood - A decorative type of fossil wood where the original organic material has been replaced - usually by chalcedony, agate, opal, etc.
- Pietersite - Chalcedony with embedded fibers of amphibole minerals, causing chatoyancy.
- Sard - A brown to brownish-red translucent variety of Chalcedony.