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Mineral: Quartz
Description: Japanese twin of two flattened crystals
Location: Dauphiné, France
Author: Weiss, 1829/1833/185; Dana, 1873. In: V.M. Goldschmidt, Atlas der Krystallformen, 1913-1923.
System: Trigonal, point group: 32
Cell: a: 1, b: 1, c: 1.1, alpha: 90, beta: , gamma: 120