In the lapidary trade, the term chalcedony is used in a limited sense, describing only the blue and white varieties, and thereby distinguisihing this gem from the kaleidoscopic variety of agate, and other forms of the entire group that is also named chalcedony. The chalcedony crystal includes a large number of types, such as chrysoprase, carnelian, jasper, bloodstone, sard, petrified wood and agate. The many sub-varieties make chalcedony, which is not a mineral species but a form of quartz, one of the biggest ‘families’ of gems...Read more about chalcedony crystal

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