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Post Info TOPIC: Kamiomi meteorite
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RE: Kamiomi meteorite
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Name: KAMIOMI
Place of fall: The village of Kamiomi, Sashima-gun (county), Ibaraki Prefecture, Japan (about 40 km northeast of Tokyo, Kamiomi has recently been incorporated in the city of Iwai).
36°02.5'N, 139°57.4'E.
Date of fall: In late March or early April during the years 1913 to 1916, at about 3 p.m.
Class and type: Stone. Olivine-bronzite chondrite (H4).
Number of individual specimens: 1
Total weight: 448 g
Circumstances of fall: The meteorite fell after detonations into a rice field near the house of the Shimamura family. A crowd of people is said to have come to see the stone at the time, but nothing was reported to the scientific world. This information was obtained by Dr. Sadao Murayama from Mr. Yoshio Shimamura in 1973. A small piece of the specimen was obtained by Dr. Murayama for examination, but the bulk of the specimen remains with the Shimamura family.
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Kamiomi meteorite. Exhibit in the National Museum of Nature and Science, Tokyo, Japan.

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Title: Mineralogy, petrography and chemistry of the chondrite, Kamiomi, Sashima-gun, Ibaraki-ken, Japan
Authors: Okada, A., Shima, M., & Murayama, S.

The Kamiomi, Sashima-gun (Iwai-shi), Ibaraki-ken, Japan, chondrite (observed to fall in spring, during the period 1913-6), consists of olivine, orthopyroxene, nickel-iron and troilite with minor amount of plagioclase, clinopyroxene, apatite and chromite. The average molar composition of olivine (Fa19) and orthopyroxene (Fs17) indicates that Kamiomi is a typical olivine bronzite chondrite. From the well-recrystallized texture, the presence of poorly-definable chondrules, homogeneous composition of olivine and absence of glass, this chondrite could be classified in petrologic type 5.
The bulk chemical composition, especially, total Fe (27.33%) and metallic Fe (17.00%) as well as Fetotal/SiO2(0.72), Femetal/Fetotal(0.633) and SiO2/MgO (1.59) support the above conclusion.
Coexistence of heavily-shocked olivine grains in the matrix composed of olivines and pyroxenes which suffered from light to moderate shock effect suggest that impacting phenomena, small-scaled but locally strong, occurred on the Kamiomi parent body.

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The Kamiomi (H5) meteorite fell in Kanto, Japan, in late March or early April during the years 1913 to 1916.
A total mass of 448 g was recovered.

36° 2' 30"N, 139° 57' 24"E



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