PLEONASTE IN BOXIAN METEORITE

There are three kinds of occurrence of pleonaste, a rare meteoritic mi neral, totally found in Boxian meteorite. They are as the following: ( i) occurring in the inner circle of the chondrule edge, of which a cir cle texture is composed; (ii) occurring in the state of inclusions, in cluded in an olivine chondrule, with close paragenesis of wadsleyite; (iii) occurring in the state of porphyry. The chondrule In the first o ccurrence belongs to CA chondrules. The chemical compositions of pleon aste are heterogeneity except far the atomic ratios of Fe/(Mg+Fe), whi ch can be attributed to the following reasons: (i) they are congenetic minerals; (ii) the heterogeneity of the compositions of the solar clo uds in the early states; (iii) the chondrites are the multiple-stage e volution; (iv) the further proof of Boxian meteorite is an unequilibri um common chondrite.