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Lombard meteorite, Broadwater Co., Montana, USA

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Iron, hexahedrite (IIAB)
Find 1953, 7 kg.

A weathered metallic mass (5.65% Ni) was recovered and later identified, acquired, and distributed by Harvey Nininger. Before sectioning, the entire mass was a single kamacite crystal profusely decorated by rhabdite prisms and lamellae. Small troilite-daubréelite inclusions are present in some sections. Tiny Carlsbergite plates are also found within the kamacite. Numerous Neumann bands are present and some cold annealing may have transpired before the meteoroid encountered the earth.

Much of the mass was distributed in 5 mm thick slices so that today no one museum appears to hold as much as 10% of the original mass.

Mineral List

8 entries listed. 7 valid minerals.

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Axon, H. J. & Waine, C. V. (1972) A Metallographic Study of Some Hexahedrites: Mineralogical Magazine 38 (298): 725-735. (June 1972).

Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam, London: New York. 245 pages.

Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.

Grady, M. M. (2000) Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge, New York, Oakleigh, Madrid, Cape Town. 690 pages.

Wasson, J.T., Huber, H. & Malvin, D.J. (2007) Formation of IIAB iron meteorites. Geochim. Cosmochim. Acta 71, 760–781.

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