Mathematics – Logic
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992metic..27..179h&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 27, no. 2, June 1992, p. 179-181.
Mathematics
Logic
2
Chondrites, Meteoritic Composition, Mineralogy, Olivine, Petrography, Pyroxenes, Chondrule, Japan, Kamacite, Meteoritic Microstructures, Spinel, Troilite
Scientific paper
A new chondrite is reported 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 pct 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. Ab80Or4), kamacite, taenite, troilite, and chromian spinel. Matrix occupying 76 vol pct 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.
Hoshino Mitsuo
Suwa Kanenori
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