Mineralogy, Mineral-Chemistry, and Composition of the Murchison (C2 ) Meteorite

摘要

The Murchison meteorite shower, September 28, 1969, occurred in and around Murchison, Victoria, Australia. Chemical and mineralogical analyses established it as a type II carbonaceous chondrite (C2). Murchison consists largely of fine-grained black matrix which has been identified as primarily a mixture of two iron-rich, low-aluminum chamosite polytypes. Contained in the matrix are four main types of inclusions: (1) single crystals and crystal fragments, (2) loosely aggregated clusters of crystals ('white inclusions'), (3) discrete true chondrules, and (4) xenolithic fragments of two other meteorite types (mostly a unique kind of C3 chondrite).