FALL, RECOVERY AND DESCRIPTION OF THE COLEMAN CHONDRITE

A 0.5 kg stony meteorite associated with a bright bolide seen over sou theastern Michigan on 1994 October 20 has been recovered. The circumst ances of the fall and recovery of this chondrite, named Coleman, are p resented. The most likely trajectory from the observations of the even t implies preatmospheric orbital parameters typical of meteorites. Gam ma-ray spectrometry of the cosmogenic radionuclides showed that the re covered mass was an interior fragment of a larger body and revealed ab normally high Na-22 and Al-26 activity. Electron microprobe analysis y ielded compositions of Fa(24.1) and Fs(20.3), which are consistent wit h an L-chondrite classification. Petrographically, the presence of cho ndrules, the observed mineralogy and the degree of chondrule-matrix in tegration suggests assignment to petrologic type 6.