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 on the blue ice field of the Queen Fabiola Mountains (Yamato Mountains) in Antarctica, on December 21, 1969.
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.
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.
Composition and classification
This meteorite is a stony enstatite chondrite. Minerals reported from the meteorite include:
- 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.
- ^ "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.