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Mineral: Calcite
Description: Contact twin on {021}
Location: Constructed
Author: Kreutz, 1907, and others. In: V.M. Goldschmidt, Atlas der Krystallformen, 1913-1923 ('Calcit').
System: Trigonal, point group: -32/m
Cell: a: 1, b: 1, c: 854, alpha: 90, beta: , gamma: 120