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Mount Wisting 95300 meteorite (WSG 95300), Mount Wisting, Victoria Land, Eastern Antarctica, Antarctica

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Latitude & Longitude (WGS84): 86° 27' 0'' South , 165° 25' 59'' West
Latitude & Longitude (decimal): -86.45000,-165.43333
Non-native locality type:Meteorite
Meteorite Class:H3.3 chondrite meteorite
Meteoritical Society Class: H3.3
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:EF : Ice cap climate


Ordinary chondrite, unequilibrated (H3.3; S2; W1)
Found,1995; 2.733 kg

The Mount Wisting 95300 (WSG 95300) chondritic stone [14 x 10 x 9 cm] was largely covered by a brown/black fusion crust with lighter splotches and completely smooth surface when found in Antarctica. Thereafter, it was soon recognized as a moderately unequilibrated (primitive) chondrite. In thin sections its most obvious constituents are the distinct, frequently white and cream-colored olivine- and pyroxene-rich chondrules (dimensions ≤ 1.8 µm). Chondrule types are quite varied (barred, radial, porphyritic…) and the chondrules are often rimmed by small amounts of feldspathic mesostasis. Unequilibrated olivine (Fa1-21) and Ca-poor pyroxene (Fs2-17) are the predominant constituents of both the chondrules and the darker matrix. Minor amounts of Fe-Ni metal and troilite are also readily observed in reflected light within the matrix, especially near rims of larger chondrules. Olivine and pyroxene compositions are characteristic of the H (high iron) ordinary chondrite group. The distinct chondrules, moderate disequilibration, and presence of primary glass are indicative of petrologic type H3.4. Undulose extinction of olivine is indicative of very moderate shock (level S2). Weathering grade (W1) is indicated by mild rustiness, mostly around metal and sulfide grains, and by the lack of prominent oxide veining.

Recent studies of WSG 95300 have searched for relicts of the early solar nebula and even pre-solar components. One interesting study of primitive chondrites revealed some unusual pre-solar spinel. Unfortunately the two grains were derived from a mix of WSG 95300 and 2 other meteorites so that the actual meteoritic host remains unknown!

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2 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.

References

Satterwhite, C. & Lindstrom, M.-eds. (1997) Antarctic Meteorite Newsletter 20(1). Johnson Space Center: Houston. (Feb 1997).

Grossman, J.N. (1998). The Meteoritical Bulletin, No. 82, 1998 July. Meteoritics & Planetary Science 33 (4,Suppl.): A221-A239. (July 1998).

Lofgren, G.E., Le, L. & Schatz, V. (1999) Partial Melting of WSG95300: A Type 3 UOC (abstract): Lunar and Planetary Science Conference XXX, abs#1742. (Mar 1999).

Zega, T.J., Nittler, L.R., Gyngard, F., Alexander, C.M. O.'D., Stroud, R.M. & Zinner, E.K. (2014) A transmission electron microscopy study of presolar spinel: G&CA. (Jan 2014).

Grady, M.M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.

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