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Mineral: Anatase
Description: Penetration twin on {112}
Location: North Common Hill, Quincy, Massachusetts, USA
Author: Palache and Warren, 1911. In: V.M. Goldschmidt, Atlas der Krystallformen, 1913-1923 ('Anatas').
System: Tetragonal, point group: 4/mmm
Cell: a: 1, b: 1, c: 2514, alpha: 90, beta: , gamma: 90