Other
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984s%26t....68..224b&link_type=abstract
Sky and Telescope (ISSN 0037-6604), vol. 68, Sept. 1984, p. 224.
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Earth-Moon System, Lunar Rocks, Meteoritic Composition, Antarctic Regions, Debris, Ejecta, Impact Damage, Oxygen Isotopes, Meteorites, Origin, Moon, Classification, Photographs, Yamato 791197, Antarctic Meteorites, Allan Hills Meteorites, Yamato Meteorites, Alha81005, Source, Samples, Meteorite, Popular, Description, Comparisons, Texture, Chemistry, Composition, Isotopes, Ejecta, Dynamics, Impacts, Escape, Acceleration, Velocity, Samples, Lunar
Scientific paper
After extensive tests at NASA's Johnson Space Center, a 31-gram stone found in the Allen Hills region of Antarctica in early 1982 and designated ALHA-81005, has been identified as a lunar meteorite. Following this discovery, two other specimens found in 1979 and 1982-83 near the Yamato Mountains in Japan were identified to be of lunar origin. Yamato-791197, a 25-gram meteorite, and another 37-gram meteorite have an unusual interior texture consisting of anorthosites, and a silicate mineral rich in calcium and aluminum, which is common among lunar highland breccia but rare in other meteorites. Other factors which were considered important in confirming that both rocks were from the moon were: the ratio of manganese to iron, and the relative abundance of three naturally occurring isotopes of oxygen (O-16, O-17 and O-18).
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