Sulphur crystal
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“The forms present upon it are two pyramids of different slope but each intersecting all three of the crystal axes when properly extended. The lower pyramid intersects the two horizontal axes at distances which are proportional to their unit lengths and if it was extended as shown by the dotted lines would also cut the vertical axis at a distance proportional to its unit length.” — Ford, 1912
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William E. Ford Dana's Manual of Mineralogy (New York: John Wiley and Sons, Inc, 1912) 11
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