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Mineral: Hematite
Description: Contact twin on {0001}, contact plane {10-10}
Location: Binntal, Wallis, Switzerland
Author: C. Palache, H. Berman, C. Frondel, The system of mineralogy. Vol I, 7th edition, John Wiley & Sons, New York, 1944.
System: Trigonal, point group: -32/m
Cell: a: 1, b: 1, c: 2734, alpha: 90, beta: , gamma: 120