Abstract
In April 1969, the chondrite was accidentally found in the side wall of the vegetable storage excavated at Shibayama‐machi, Sanbu‐gun, Chiba‐ken, Japan, by Mr. A. Ishii and his grandson, Mr. S. Ito.The chondrite named Shibayama has been weathered thoroughly for a long period of burial underground.The bulk chemical composition, especially total Fe (21.41%) and ratios of Fetotal/SiO2(0.557), SiO2/MgO (1.59) and molar composition of olivine (Fa23) and pyroxene (Fs22) as well as mineral composition, indicate that Shibayama is a typical olivine‐hypersthene chondrite. If the oxidized Fe is assumed only from metallic Fe, the original metallic Fe (7.75%) and Femetal/Fetotal(0.361) also support the above conclusion.From the well‐recrystallized texture, indistinct and obliterated chondrule‐matrix boundary, homogeneous composition of olivine and pyroxene, absence of igneous glass, and interstitial and well‐developed plagioclase, this chondrite could be classified in petrologic type 6.Mosaic texture, kink bands, undulatory extinction of silicate grains and maskelynitization of plagioclase indicate that Shibayama suffered from a heavy shock effect, as is seen in other L‐6 group chondrites.
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