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The Natural Formation and Occurrence of Green Quartz

Thomas R. Paradise, March 1, 1982

How amethyst under certain conditions may turn green rather than the expected citrine-yellow.

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The internal structures of natural pearls from the marine mollusk Pinctada maxima are the subject of the lead article in this issue. The scattered loose pearls on the cover are from Paspaley’s natural pearl collection, which includes one discovered in the 1970s at the Eighty Mile Beach fishing grounds
G&G Spring 2021 Edition
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