Crystal of Chalcopyrite
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“...a combination of two bisphenoids (P and P’), two bipyramids of the second order (b and c), and the basal pinacoid (a).” -The Encyclopedia Britannica 1910
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Encyclopaedia Britannica (11th ed., vol. 7) (New York, NY: The Encyclopaedia Britannica Company, 1910)
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