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Ortho and para-armalcolite samples in Apollo 17.Two paragenetically contrasting forms of armalcolite are present in basalts from the Apollo 17 Taurus-Littrow landing site. These armalcolites differ in optical properties, in crystal habit and in their distribution between coarse and fine grained rocks. It is proposed to call the two armalcolite forms ortho-armalcolite and para-armalcolite. Texural relationships and the evidence of experimental melting show that ortho-armalcolite is always the first crystalline phase to appear from unusually titanium rich magmas. The origin of para-armalcolite is not yet fully understood.
Document ID
19730044937
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Haggerty, S. E.
(Massachusetts, University Amherst, Mass., United States)
Date Acquired
August 7, 2013
Publication Date
April 23, 1973
Publication Information
Publication: Nature Physical Science
Volume: 242
Subject Category
Space Sciences
Accession Number
73A29739
Distribution Limits
Public
Copyright
Other

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