Pyroxene-Garnet Transformation in Coorara Meteorite

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Science  15 May 1970:
Vol. 168, Issue 3933, pp. 832-833
DOI: 10.1126/science.168.3933.832


Majorite is a new garnet in a veinlet of the Coorara meteorite. Its chemical composition is compatible with derivation mostly from original pyroxene, not from olivine as originally reported. Silicon is partly in sixfold coordination. Ringwoodite, a spinel of olivine composition, occurs as purple grains set in a matrix of fine-grained garnet. The similar mineralogy and texture of the Coorara and Tenham meteorites suggest a common parent body.

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