Yamato 691
| Yamato 691 | |
|---|---|
Observed fall | No |
| Fall date | 4.5 billion years ago |
| Found date | December 21, 1969 |
| TKW | 715 grams (1.576 lb) |
The Yamato 691 (abbreviated Y-691) is a 4.5 billion year old
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
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
- 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.
- 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.