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Basic information Name: Koshigaya
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes, confirmed fall
Year fell: 1902
Country: Japan
Mass:help 4.05 kg
Recommended:  L4    [explanation]

This is 1 of 2009 approved meteorites (plus 4 unapproved names) classified as L4.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 23 Feb 2023
Writeup from MB 112:

Koshigaya        35°54’59"N, 139°46’51"E

Kanto, Japan

Confirmed fall: 1902 Mar 8

Classification: Ordinary chondrite (L4)

History: Around dawn on March 8, 1902 (the date is confirmed by the Tokyo Asahi Newspaper on April 25, 1902), a detonating sound was heard at the Sakurai-mura, Minami-Saitama-gun (now the Koshigaya city), Saitama prefecture, Japan. A few days later, Mr. Kihachi Nakamura found a 4 kg stone from ca. 1m depth of the meteorite pit found in his own farm. Since then, it was kept in the Nakamura family. Through a society for the study of the local history in the Koshigaya city in 2021, the stone was brought to NMNS, where cosmogenic 26Al gamma rays were detected by the pure Ge detector and it was confirmed as a meteorite.

Physical characteristics: The 4050 g mass is roughly rounded form and is almost fully covered by the fusion crust. A small portion is lacking probably due to the crash on the ground.

Petrography: A polished thin section and a polished mount were made from a 1.9g fragment at NIPR.

Geochemistry: Olivine Fa24.9, range Fa22.3-26.1, Fa PMD 2.1% (N=35). Low-Ca pyroxene compositions are Fs17.4Wo1.2, range Fs9.4-27.2, Fs PMD 20.4% ( N=14). Gamma ray measurements at NMNS did not detect show the absence of 22Na (half-life 2.6 y), suggesting that the fall date was more than a few tens of years ago. Rare gas analyses are underway at KyuU.

Classification: Ordinary chondrite (L4, S2).

Specimens: NMNS: 120 g for Type specimen; NIPR: polished thick and thin sections

Data from:
  Table 0
  Line 0:
Date:1902 Mar 8
Mass (g):4050
Shock stage:S2
Weathering grade:W0
Fayalite (mol%):24.9 (22.3-26.1, N=35)
Ferrosilite (mol%):17.4 (9.4-27.2, N=14)
Wollastonite (mol%):1.2 (0.2-3.3, N=14)
Classifier:A. Yamaguchi, NIPR; S. Yoneda, NMNS
Type spec mass (g):120
Type spec location:NMNS
Main mass:with the family of the finder
Finder:Mr. Kihachi Nakamura
Comments:Submitted by S. Yoneda, NMNS
   and collections
NIPR: Antarctic Meteorite Research Center, National Institute of Polar Research, 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan; Website (institutional address; updated 9 Dec 2013)
NMNS: National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Ibaraki 305-0005, JAPAN, Japan; Website (institutional address; updated 16 Jun 2014)
KyuU: Department of Earth and Planetary Science, Kyushu University Hakozaki, Higashi-ku, Fukuoka-shi 812- 8581, Japan (institutional address)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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Public domain photographs:
Shigekazu Yoneda         

     Recommended::   (35° 54' 59"N, 139° 46' 51"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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