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The Hashima, Japan H4 chondrite: A newly reported meteorite
Author(s) -
Hoshino Mitsuo,
Suwa Kanenori
Publication year - 1992
Publication title -
meteoritics
Language(s) - English
Resource type - Journals
eISSN - 1945-5100
pISSN - 0026-1114
DOI - 10.1111/j.1945-5100.1992.tb00746.x
Subject(s) - chondrule , troilite , chondrite , kamacite , pyroxene , olivine , geology , meteorite , geochemistry , mineralogy , astrobiology , physics
We report a new chondrite that fell in Hashima City in central Japan sometime during the period 1868–1912. The chondrite weighs 1110.64 g and exhibits distinct chondritic structure. Chondrules occupy 24 vol% of the stone and consist of olivine (average Fa 17,8 ), low‐Ca pyroxene (average Fs 15,8 Wo 0.9 ), devitrified glass and lesser amounts of oligoclase ( ca . Ab 80 Or 4 ), kamacite, taenite, troilite and chromian spinel. Matrix occupying 76 vol% of the stone consists of olivine, low‐Ca pyroxene, kamacite, taenite, troilite, cryptocrystalline minerals and lesser amounts of chromian spinel and chlorapatite. Matrix minerals have the same compositions as those in chondrules. Mineral chemistry, bulk chemistry and magnetic properties indicate that Hashima is an H‐group chondrite. Well‐defined chondrules, scarcely recrystallized oligoclase and relatively small variations of olivine and low‐Ca pyroxene compositions indicate that Hashima is of petrologic type 4.