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Mineral: Quartz
Description: Left-handed Dauphiné twin (mimetic twin on [001])
Location:
Author: Haüy, 1801, and others. 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