Yamato 691

Yamato 691
TypeChondrite
ClassEnstatite chondrite
CompositionPl (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]
CountryAntarctica
RegionQueen Fabiola Mountains (Yamato Mountains)
Coordinates71°50′S 36°15′E / 71.833°S 36.250°E / -71.833; 36.250[2]
Observed fallNo
Fall date4.5 billion years ago
Found dateDecember 21, 1969
TKW715 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]

  1. ^ "Catalog of Antarctic Meteorites" (PDF). Tokyo: National Institute of Polar Research. 2000. Retrieved 2011-04-07.
  2. ^ a b "Yamato 691". The Meteoritical Society. Retrieved 2011-04-07.
  3. ^ Dwayne C. Brown; William Jeffs (2011-04-05). "Scientists Find New Type Of Mineral In Historic Meteorite". NASA. Retrieved 2011-04-07.