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Metal and Phosphide Phases in Luna 24 Soil Fragments

H. J. Axon, M. J. Nasir and F. Knowles
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences
Vol. 297, No. 1428 (Jun. 17, 1980), pp. 7-13
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/36833
Page Count: 9
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Metal and Phosphide Phases in Luna 24 Soil Fragments
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Abstract

Soil fragments in the 106-150 and 150-250 μ m size ranges were selected for metallographic and microprobe examination on the basis of their magnetic properties. Serial sections of the mounted fragments were examined. One fragment proved to be a compositionally zoned crystal of phosphide with no metal phase but partly embedded in glass. Another was a coarse-grained association of silica with ilmenite and fayalite with a 5 μ m particle of metallic iron in troilite. One splinter of oxide contained a central spine of metallic iron. The remaining six fragments contained 10 μ m particles of iron-nickel-cobalt alloy with compositions in either the 'meteoritic' or the low Ni - low Co sub-meteoritic composition ranges of Ni, Co content. In some fragments separate particles of alloy had different Ni, Co contents. No particles of high Co metal were encountered.

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