Lunar Anorthosite 15415: Texture, Mineralogy, and Metamorphic History

Science  28 Jan 1972:
Vol. 175, Issue 4020, pp. 432-436
DOI: 10.1126/science.175.4020.432


Lunar anorthosite 15415 consists almost entirely of anorthite (homogeneous anorthite 96.6 molecule percent), with accessory diopsidic augite and traces of hypersthene, ilmenite, and a silica mineral. The rock has had a complex metamorphic history. The texture reflects at least two episodes of shearing (followed by intense and partial recrystallization, respectively), one episode of cataclastic deformation, and one or more episodes of shattering and fragmentation.