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Simple Crystal of Gypsum
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Description: "...to be cut in half by this plane (the twinned plane, reference Twinned Crystal of Gypsum) and one portion to be rotated through 180 degrees about the normal to the same plane. Described as being twinned on the plane." -The Encyclopedia Britannica 1910
Source: The Encyclopedia Britannica Eleventh Edition Encyclopaedia Britannica (11th ed., vol. 7) (New York: The Encyclopaedia Britannica Company, 1910) 582
Keywords: simple, crystal, gypsum
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