Chalcedony (Quartz part two)

Posted by Rasmussen Gems and Jewelry LLC
Chalcedony is a catch all term that includes many well known varieties of cryptocrystalline quartz gemstones. They are found in all 50 States, in many colors and color combinations, and in sedimentary, igneous, and metamorphic rocks. Chalcedony includes carnelian, sard, plasma, prase, bloodstone, onyx, sardonyx, chrysoprase, thundereggs, agate, flint, chert, jasper, petrified wood, and petrified dinosaur bone just to name a few of the better known varieties.
Flint, chert and onyx are usually found in black.  The absence of all color.

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Chalcedony (Quartz part two)