The Barea, Dyarrl Island, and Emery Meteorites, and a Review of the Mesosiderites

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

Summary: Barea and Emery are typical mesosiderites, whereas Dyarrl Island1 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.

1The actual place of fall is Dyaul Island; see below.

Mineralogical Magazine; June 1973 v. 39; no. 302; p. 204-215; DOI: 10.1180/minmag.1973.039.302.08
© 1973, The Mineralogical Society
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