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Mineral: Spinel
Description: Contact twin on {111}
Location:
Author: Mohs, 1824, and many others. In: V.M. Goldschmidt, Atlas der Krystallformen, 1913-1923.
System: Cubic, point group: m3m
Cell: a: 1, b: 1, c: 1, alpha: 90, beta: , gamma: 90