Quartz

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“Terminated usually by a combination of a positive and negative rhombohedron, which often are so equally developed as to give the effect of a hexagonal pyramid. Sometimes one rhombohedron predominates or occurs alone.” — Ford, 1912

Galleries

Crystals

Source

William E. Ford Dana's Manual of Mineralogy (New York: John Wiley and Sons, Inc, 1912) 174

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