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Allan Hills A77257 meteorite (ALHA77257), Allan Hills, Victoria Land, Eastern Antarctica, Antarctica

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Latitude & Longitude (WGS84): 76° 43' South , 159° 40' East
Latitude & Longitude (decimal): -76.71667,159.66667
Other regions containing this locality:Antarctic Meteorites
Non-native locality type:Meteorite
Meteorite Class:Ureilite meteorite
Meteoritical Society Class: Ureilite
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:EF : Ice cap climate

Find 1997; 1996 g

The Ureilites are ultramafic achondrites that contain interstitial carbon as graphite or diamond. The ALHA77257 Ureilite contains small amounts of both graphite and diamond as well as several other interesting interstitial phases. ALHA77257's dominant lithology, however, is that of a fairly coarse-grained stone compositionally dominated by olivine (~80%) and accompanying pyroxene (~15%) grains. Undulose extinction in olivine, polysynthetic twinning in pyroxene, and microtextures in metal all provide clues for deciphering the impact history of this and other ureilites. Perhaps most significant is evidence from distorted graphite grains that the diamonds in this and other ureilites have indeed been produced primarily by shock impact.

Significant amounts of terrestrial weathering products (limonite, hydromagnesite, …) — usually concentrated in the interstitial phases — are noted by several observers.

Mineral List

7 valid minerals.

Meteorite/Rock Types Recorded

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This page 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.


Score, R., Schwarz, C. M., King, T. V. V., Mason, H., Bogard, D. D. & Gabel, E. M. (1981) Antarctic Meteorite Descriptions: 1976-1977-1978-1979. Antarctic Meteorite Newsletter 4 (1), JSC, Houston. (Feb 1981)

Marvin, U. B. & Motylewski, K. (1980) Mg-Carbonates and Sulfates on Antarctic Meteorites (abstract). Lunar and Planetary Science XI: 669-670. (March 1980)

Mori, H. & Takeda, H. (1983) Deformation of Olivine in the Antarctic Ureilites, Allan Hills 77257 and 78262 (abstract): Lunar and Planetary Science XIV, 519-520. (March 1983)

Berkley, J. L. & Goodrich, C. A. (1985) Cohenite-Bearing Metallic Spherules in Ureilites: Petrology and Implications (Abstract). Lunar and Planetary Science XVI, 49-50. (March 1985)

Nakamuta, Y. & Aoki, Y. (2000). Mineralogical evidence for the origin of diamond in ureilites. Meteoritics & Planetary Science 35 (13): 487-493. (May 2000)

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