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Basic information Name: Sayama
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes
Year fell: 1986
Country: Japan
Mass:help 430 g
NHM Catalogue:  5th Edition  (2000)  CM2
Meteoritical Bulletin:  MB 85  (2001)  CM2
MetBase:  v. 7.1  (2006)  CM2
Recommended:  CM2    [explanation]

This is 1 of 621 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Writeup from MB 85:


Saitama Prefecture, Japan

Fell 1986 ~April 29, time unknown

Carbonaceous chondrite (CM2)

A 430 g stone was found one morning near the porch of the finder's house. He did not pick it up for fear of radioactivity, as news of the Chernobyl accident had just broken. Several days later it rained, and the next-door neighbor discovered a leak in his roof, apparently caused by the impact of the meteorite. At this point, the water-soaked meteorite was collected. Mineralogy and classification (A. Okada, RIKEN; S. Yoneda, NSMT; T. Nakamura, KyuU; M. Zolensky, JSC): olivine, Fa0–23; aqueous alteration is extensive. Bulk composition (H. Naraoka, Y. Oura and M. Ebihara, TMU): C = 1.99 wt%, N = 0.08 wt%, H = 1.37 wt%, Zn = 0.54 × CI, S = 0.42 × CI. Oxygen isotopes (M. Kusakabe, OkaU): δ17O = +3.2 to 4.2, δ18O = +9.9 to 12.0. Cosmic-ray exposure age (K. Nagao, UTok): <1 Ma. Specimens: main mass owned by finder and on loan to NSMT; type specimen, 23 g, NSMT.

Plots: O isotopes:  
   and collections
JSC: Mailcode XI, 2101 NASA Parkway, NASA Johnson Space Center, Houston, TX 77058, United States; Website (institutional address; updated 28 Jul 2022)
UTok: University Museum, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan (institutional address; updated 3 Oct 2021)
KyuU: Department of Earth and Planetary Science, Kyushu University Hakozaki, Higashi-ku, Fukuoka-shi 812- 8581, Japan (institutional address)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)
RIKEN: Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako Saitama 351-0198, Japan (institutional address)
TMU: Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji-shi, Tokyo 192-0397, Japan (institutional address)
NSMT: National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Ibaraki 305-0005, JAPAN, Japan; Website (institutional address; updated 16 Jun 2014)
References: Published in Meteoritical Bulletin, no. 85, MAPS 36, A293-A322 (2001)
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MeteoriteCollector.org - JNSM - Tokyo   

     Catalogue of Meteorites:   (35° 52'N, 139° 24'E)
     Recommended::   (35° 52'N, 139° 24'E)

     This is 1 of 9 approved meteorites from Kanto, Japan (plus 4 unapproved names)
     This is 1 of 58 approved meteorites from Japan (plus 12 unapproved names)
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