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Mineral: Herderite
Description: {101}, {12-2}, {011}, {001}, modified
Location: Greenwood, Maine, USA
Author: Penfield, 1894. In: V.M. Goldschmidt, Atlas der Krystallformen, 1913-1923.
System: Monoclinic, point group: 2/m
Cell: a: 631, b: 1, c: 641, alpha: 90, beta: , gamma: 90