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Journal of the Mineralogical Society of Japan
The constituent units of the Allende meteorite are briefly summarized and their possible origins are presented. Among coarse-grained CAI's, type-B2 CAI's are the most primitive, and type-A CAI's (compact type) are considered to have been formed from the type-B2 via type-B1 by gas reactions in the primordial solar nebula. Fine-grained CAI's or amoeboid olivine inclusions may be primarily aggregates consisting mainly of fassaite with small amounts of spinel and melilite or olivine with variabledoi:10.2465/gkk1952.16.91 fatcat:rbe2e4aktjgvxpxjhthop74n3u