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Delegate meteorite, Delegate, Wellesley Co., New South Wales, Australia

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Iron meteorite, Octahedrite (IIIAB, Om)
Find, 1904; 27.7 kg

A somewhat weathered Fe-rich mass [~9.5% Ni] was found near a gully off Sawpit Creek near the village of Delegate. The meteorite is a somewhat normal type IIIAB iron with a distinctive Widmanstätten structure accompanied by ~40 vol % plessite plus accessory schreibersite and troilite. Brecciated schreibersite is present as vermicular bodies, Brezina lamellae, and rhabdites. Troilite is a minor constituent present mostly in phosphides, but one very unusual troilite inclusion is accompanied by a number of minor phases. The geochemistry is somewhat anomalous as the iridium content is higher than normal for IIIAB irons. The kamacite has been hardened by severe pre-terrestrial shock. Post-terrestrial weathering has produced some iron oxides as well as cream-colored pentlandite and other sulfides.

The rather long cosmic ray exposure age of ~750-800 Ma is similar to that of many irons. Delegate is one of 299 irons classified as a IIIAB iron. The main mass is held at the Australian Museum in Sydney.

Mineral List



12 entries listed. 9 valid minerals.

The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

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, vol 2: University of California Press.

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

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