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What is the birthstone for June? It actually has three. A guide to the colorful gemsThe stone appears green or blue in daylight or fluorescent light. In incandescent light, it is red or purple. The gem takes its name from Emperor Alexander II of Russia, the Geological Institute ...
Courtesy Daniel Trinchillo, Fine Minerals International. Amethyst is the purple variety of the quartz mineral species. It’s the gem that’s most commonly associated with the color purple, even though ...
176–187; Spring 1994 Lab Notes, p. 43). Purple rock containing jadeite and quartz has been reported in the Bursa region of western Turkey (M. Hatipoǧlu et al., “Gem-quality Turkish purple jade: ...
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