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The Barea, Dyarrl Island, and Emery meteorites, and a review of the mesosiderites

Published online by Cambridge University Press:  05 July 2018

Brian Mason  and
E. Jarosewich
Brian Mason
Affiliation:
Smithsonian Institution, Washington, D.C., U.S.A.
E. Jarosewich
Affiliation:
Smithsonian Institution, Washington, D.C., U.S.A.
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Summary

Barea and Emery are typical mesosiderites, whereas Dyarrl Island is unique in having the lowest metal content and the highest FeO/(FeO + MgO) ratio of any meteorite of this class. Average pyroxene compositions have been determined for the individual mesosiderites, and show a sequential increase in FeSiO3 content, ranging from a mean of 21 mole % for Veramin to 45 mole % for Dyarrl Island. Steinbach may possibly be classed as a mesosiderite, since its mineralogy is identical except for the absence of plagioclase. Dalgaranga and Mt. Padbury may be a paired fall. The chemical and mineralogical composition of the silicate material of the mesosiderites is similar to, but not identical with the howardites; the overall range of composition is greater in the mesosiderites.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 302 , June 1973 , pp. 204 - 215
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1973

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