Yamato 691
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]
Yamato 691 | |
---|---|
Type | Chondrite |
Class | Enstatite chondrite |
Composition | Pl (An32-75), En-99.2, Wo-0.3, tro., nini., oldh., perr., schr., metal (2.2–2.5% Ni, 0.16–0.22% CO)[1] |
Country | Antarctica |
Region | Queen Fabiola Mountains (Yamato Mountains) |
Coordinates | 71°50′S 36°15′E[2] |
Observed fall | No |
Fall date | 4.5 billion years ago |
Found date | December 21, 1969 |
TKW | 715 grams (1.576 lb) |
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]
See also
References
- "Catalog of Antarctic Meteorites" (PDF). Tokyo: National Institute of Polar Research. 2000. Retrieved 2011-04-07.
- "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
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