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Mineral: Chrysoberyl
Description: Repeated penetration twin on {130}
Location: Takowaja, Ural, Russia
Author: Kokscharow, 1853; Schrauf, 1877. In: V.M. Goldschmidt, Atlas der Krystallformen, 1913-1923 ('Chrysoberyll').
System: Orthorhombic, point group: mmm
Cell: a: 582, b: 1, c: 471, alpha: 90, beta: , gamma: 90