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Mineral: Ferrotapiolite
Description: Contact twin on {013}, distorted by elongation on [0-13]
Location: Moss, Norway
Author: C. Palache, H. Berman, C. Frondel, The system of mineralogy. Vol I, 7th edition, John Wiley & Sons, New York, 1944.
System: Tetragonal, point group: 4/mmm
Cell: a: 4756, b: 4756, c: 9189, alpha: 90, beta: , gamma: 90