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Basic information Name: Nagara
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2012
Country: Japan
Mass:help 16.24 kg
Meteoritical Bulletin:  MB 107  (2018)  Iron, IAB-MG
Recommended:  Iron, IAB-MG    [explanation]

This is 1 of 124 approved meteorites classified as Iron, IAB-MG.   [show all]
Search for other: IAB complex irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 20 Feb 2018
Writeup from MB 107:

Nagara        35°26’33.9"N, 136°46’51.5"E

Chubu, Japan

Find: 2012 Oct

Classification: Iron meteorite (IAB-MG)

History: A 6.5 kg piece of iron was discovered by Mr. K. Mitsumura in October, 2012, among stones plowed from his chestnut yard in Nagara, Gifu city, Gifu prefecture, Japan. Mr. Mitsumura took the specimen to his home and kept it till June, 2017. Eventually, he considered that it might be a meteorite and the specimen was brought by his friend Mr. H. Iwasa to S. Kawakami at Gifu Shotoku Gakuen Univ. Then, the specimen was sent to T. Mikouchi, UTok for identification. A second 9.7 kg mass was found later.

Physical characteristics: The 6.5 kg mass has an exterior with several rounded ridges and shows a brownish dark surface color coated by rust.

Petrography: Polished sections (all ca. 12 × 6 mm in sizes) show no Widmanstatten pattern and >95% of the sections consist of kamacite with veins of terrestrial weathering products (up to 0.5 mm wide). Rare schreibersite is present at the interior of such weathered veins. Taenite is present as small elongated grains (~0.1 mm wide and ~0.5 mm long) with less than 0.1% abundance.

Geochemistry: Electron microprobe analysis (T. Mikouchi, UTok): Fe=92.0-94.5, Ni=5.5-6.5 and Co=0.55-0.65 for kamacite (N=549), Fe=45-54, Ni=30-38 and P=15 for schreibersite (N=26), and Fe=61-65, Ni=34-39 and Co=0.1-0.2 for taenite (N=9). LA-ICP-MS data (A. Yamaguchi, NIPR and N. Shirai at Tokyo Met. U.): Ni=6.10, (in wt%); Ir=4.25, Ga=91.6, Ge=402, Au=1.58 (all μg/g, average of ~5 mm long 4 traverses on the section).

Classification: IAB-MG

Specimens: UTok: 52.7 g slice (after cutting of small chips for polished mounts) and NIPR: 3 polished mounts

Data from:
  Table 0
  Line 0:
Date:2012 Oct
Mass (g):16243
Class:Iron, IAB-MG
Classifier:T. Mikouchi, UTok; A. Yamaguchi, NIPR; N. Shirai, Tokyo Metropol. Univ.; S. Kawakami. Gifu Shotoku Gakuen Univ.
Type spec mass (g):55.8
Type spec location:UTok and NIPR
Main mass:Finder
Finder:K. Mitsumura
Comments:Submitted by T. Mikouchi, UTok
   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)
UTok: University Museum, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan (institutional address; updated 3 Oct 2021)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Public domain photographs:
Takashi Mikouchi   

     Recommended::   (35° 26' 34"N, 136° 46' 51"E)

     This is 1 of 14 approved meteorites from Chubu, Japan (plus 2 unapproved names)
     This is 1 of 58 approved meteorites from Japan (plus 12 unapproved names)
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