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Mineral: Malachite
Description: Contact twin on {100}
Location: Joachimstal, Bohemia, Czech Republic
Author: Lang, 1863. In: V.M. Goldschmidt, Atlas der Krystallformen, 1913-1923.
System: Monoclinic, point group: 2/m
Cell: a: 788, b: 1, c: 267, alpha: 90, beta: , gamma: 90