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St. Mark's meteorite, Chris Hani District, Eastern Cape Province, South Africa

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Latitude & Longitude (WGS84): 32° 1' South , 27° 25' East
Latitude & Longitude (decimal): -32.0166666667, 27.4166666667
Non-native locality type:Meteorite


Enstatite Chondrite, high-iron [EH5; S3]
Fall, 3 January 1903, 13.8 kg

At 11 P.M. a brite bolide was seen, four detonations were heard, and a 13.78 kg stone was seen to fall near St. Mark’s mission Station in the Transakei region. St. Mark's is now classified as an EH4 Enstatite Chondrite. Enstatite Chondrite are distinguished by their bulk chemistry, unusually earth-like oxygen isotope ratios, abundant Enstatite (an iron-free pyroxene) and several other unusual highly reduced mineral assemblages. The high-iron (EH) chemical group is further distinguished by small chondrules, metal (~10 vol%) and the invariable presence of niningerite (MgS) and perryite (a silicide). The petrologic type EH4 chondrites are characterized by abundant chondrules, homogenized olivine and recrystallized fine-grained matrix.
St. Mark’s has also experienced significant pre-terrestrial shock (Shock Stage S3)

Mineral List


15 valid minerals. 1 (TL) - type locality of valid minerals.

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

Mason, B. H. (1966). The Enstatite Chondrites. Geochimica et Cosmochimica Acta 30, 23-30. (Jan 1966)

Keil, K.,& Snetsinger, K.G., (1966) Niningerite: a new meteoritic sulfide. Science 155, 451-453.


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

Leitch, C.A.,& Smith, J.V., (1982) Petrography, mineral chemistry and origin of Type I enstatite chondrites. Geochimica et Cosmochimica Acta 46, 2083-2097.

Brearley, A. J. & Jones, R. H. (1998): Chondritic Meteorites. In: Planetary Materials (Papike, J. J., Editor): Chapter 3, 398 pages. Mineralogical Society of America: Washington, DC, USA.

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


Shimizu, M., Yoshida, H., & Mandarino, J.A., (2002) The new mineral species keilite, (Fe,Mg)S, the iron-dominant analogue of niningerite. Canadian Mineralogist 40, 1687-1992.

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