Yamato 691
| 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′S36°15′E/ 71.833°S 36.250°E[2] |
| Observed fall | No |
| Fall date | 4.5 billion years ago |
| Found date | December 21, 1969 |
| TKW | 715 grams (1.576 lb) |
TheYamato 691(abbreviatedY-691) is a 4.5 billion year oldchondrite meteoritediscovered by members of theJapanese Antarctic Research Expedition[3]on theblue ice fieldof theQueen Fabiola Mountains(Yamato Mountains) inAntarctica,on December 21, 1969.[2]
History
[edit]Yamato 691 was one among 9 meteorite specimens identified by the Japanese Expedition Team in 1969. It was later studied at theMax 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
[edit]This meteorite is a stonyenstatite 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
[edit]References
[edit]- ^"Catalog of Antarctic Meteorites"(PDF).Tokyo:National Institute of Polar Research.2000.Retrieved2011-04-07.
- ^ab"Yamato 691".The Meteoritical Society.Retrieved2011-04-07.
- ^Dwayne C. Brown; William Jeffs (2011-04-05)."Scientists Find New Type Of Mineral In Historic Meteorite".NASA.Retrieved2011-04-07.
- ^Clarke, R. S. Jr. (1974)."Meteoritical Bulletin, No. 52".Meteoritics.9:118.Bibcode:1974Metic...9..101C.Retrieved2011-04-07.
- ^Bryner, Jeanna (2011-04-06)."4.5-Billion-Year-Old Antarctic Meteorite Yields New Mineral".LiveScience.Retrieved2011-04-07.
- ^"Yamato 691 Meteorite, Queen Fabiola Mountains (Yamato Mountains), Antarctica".Retrieved2011-04-07.