Yamato 691
Meteorite found in Antarctica
71°50′S 36°15′E / 71.833°S 36.250°E / -71.833; 36.250[2]The Yamato 691 (abbreviated Y-691) is a 4.5 billion year old chondrite meteorite discovered by members of the Japanese Antarctic Research Expedition[3] on the blue ice field of the Queen Fabiola Mountains (Yamato Mountains) in Antarctica, on December 21, 1969.[2]
History
Yamato 691 was one among 9 meteorite specimens identified by the Japanese Expedition Team in 1969. It was later studied at the Max Planck Institute for Chemistry, Mainz, Germany.[4]
In April 2011, NASA and co-researchers from the United States, South Korea and Japan have found a new mineral named "Wassonite" in Yamato 691.[5]
Composition and classification
This meteorite is a stony enstatite chondrite. Minerals reported from the meteorite include:[6]
- Troilite
- Spinel
- Augite
- Diopside
- Enstatite
- Pigeonite
- Albite
- Nepheline
- Iron
- Olivine
- Wassonite – discovered in April, 2011
See also
References
- ^ "Catalog of Antarctic Meteorites" (PDF). Tokyo: National Institute of Polar Research. 2000. Retrieved 2011-04-07.
- ^ a b "Yamato 691". The Meteoritical Society. Retrieved 2011-04-07.
- ^ Dwayne C. Brown; William Jeffs (2011-04-05). "Scientists Find New Type Of Mineral In Historic Meteorite". NASA. Retrieved 2011-04-07.
- ^ Clarke, R. S. Jr. (1974). "Meteoritical Bulletin, No. 52". Meteoritics. 9: 118. Bibcode:1974Metic...9..101C. Retrieved 2011-04-07.
- ^ Bryner, Jeanna (2011-04-06). "4.5-Billion-Year-Old Antarctic Meteorite Yields New Mineral". LiveScience. Retrieved 2011-04-07.
- ^ "Yamato 691 Meteorite, Queen Fabiola Mountains (Yamato Mountains), Antarctica". Retrieved 2011-04-07.
External links
- Mindat.org
- Petrochemical study of the Yamato-691 enstatite chondrite (EH3) II: Descriptions and mineral compositions of unusual silicate-inclusions (1988)
- Trace element composition and distribution of Yamato-691, an unequilibrated enstatite chondrites (1988)
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