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The color of amethyst, rose, and blue varieties of quartz
Date:
1917
Citation:
Watson, Thomas L. and Beard, R. E. 1917. "The color of amethyst, rose, and blue varieties of quartz." Proceedings of the United States National Museum. 53 (2220):553–563. https://doi.org/10.5479/si.00963801.2220.553
