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The Mayo Belwa meteorite: a new enstatite achondrite fall

Published online by Cambridge University Press:  05 July 2018

A. L. Graham ,
A. J. Easton  and
R. Hutchison
A. L. Graham
Affiliation:
Department of Mineralogy, British Museum (Natural History), London SW7 5BD
A. J. Easton
Affiliation:
Department of Mineralogy, British Museum (Natural History), London SW7 5BD
R. Hutchison
Affiliation:
Department of Mineralogy, British Museum (Natural History), London SW7 5BD
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Summary

Mayo Belwa, a highly shocked enstatite achondrite, fell during the evening of 3 August 1974 in the Adamawa District, NE. Nigeria (8° 58' N., 12° 05' E.). The stone weighed 4·85 kg and was deposited in the Geological Survey of Nigeria and loaned for study to the British Museum (Natural History). It is composed principally of enstatite (0·02 FeO%), with some olivine (Fo100), diopside, feldspar (An9 Ab88 Or3), and minor Fe-Ni metal and the sulphides oldhamite, daubréelite, ferroan alabandine, and troilite. The kamacite contains between 0·15% and 1·2% Si and the troilite contains 1·1% Ti. The meteorite possesses vuggy cavities, which contain fluor-amphibole needles projecting from their walls, suggesting the presence at some time of a volatile-rich phase. The titanium-rich troilite, the nearly ironfree enstatite and the Mg/Si ratio are typical of the E-achondrites.

Type
Research Article
Information
Mineralogical Magazine , Volume 41 , Issue 320 , December 1977 , pp. 487 - 492
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1977

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