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Mineral: Aragonite
Description: Contact twin on {110}
Location: Spain
Author: HaĆ¼y, 1801/1823. In: V.M. Goldschmidt, Atlas der Krystallformen, 1913-1923 ('Aragonit').
System: Orthorhombic, point group: mmm
Cell: a: 622, b: 1, c: 721, alpha: 90, beta: , gamma: 90