| 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 / 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) |
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
[edit]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
[edit]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
[edit]References
[edit]- ^ "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.
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction