From search of external encyclopedias: From search of external encyclopedias:
Chalcedony (Chemistry) [Trigonal minerals] [Lithics] [Chalcedony] It can assume a wide range of colors, but those most ... Chrysoprase (Chemistry) [Quartz gemstones] [Chalcedony] Gemstone variety of chalcedony ... Moss agate (Chemistry) [Chalcedony] The colors are formed due to trace amounts of metal present ... Pietersite (Chemistry) [Chalcedony] Commercial term for a variety of chalcedony ...
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