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Emery meteorite, Hanson Co., South Dakota, USA

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Latitude & Longitude (WGS84): 43° 33' 48'' North , 97° 35' 0'' West
Latitude & Longitude (decimal): 43.56333,-97.58333
Non-native locality type:Meteorite
Meteorite Class:Mesosiderite-A3 meteorite
Meteoritical Society Class: Mesosiderite-A3
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:Dfa : Hot-summer humid continental climate

Stony-iron, Mesosiderite-A3
Find, 1962; 16.7 kg

A single mass was found in a field by a 12 yr. old boy and left in pile of farmyard stones for about 6 years. With ~50 wt% Fe-Ni metal, comparable silicate abundances (~40wt%/~60vol%), minor troilite, and a few subsidiary phases, the Emery mass was quickly recognized as a mesosiderite. As a polymict breccia, Emery hosts a variety of lithic and metal clasts as well as single crystals. The major silicates are mildly magnesian orthopyroxenes ('hypersthene') and variable Ca-rich plagioclase both as crystals and in matrix. Smaller amounts of olivine (Fa18-28), tridymite, and augite are also found. Fe-Ni metal is predominantly kamacite with minor taenite. Additional opaques include oxides and merrillite plus traces of graphite and schreibersite. Coronas on the olivine crystals indicate high temperature reactions between the olivine and the mesosideritic matrix. Discussions continue as to how the slow metallographic cooling rates calculated for mesosiderite Fe-Ni metal, Ar39/40 'ages' of putative impacts 3.6 billion years ago, and high resolution oxygen-isotope affinities between the mesosiderites and the (mostly) Vesta-derived HED meteorites can be explained and reconciled.

Emery and 2 other mesosiderites are classified as a Mesosiderite-A3 (subgroup A = high plagioclase abundance; petrologic type 3 = largely reequilibrated matrix). As of 2000, the largest portions of the Emery mass were held at the Max-Planck-Institute for Chemistry in Mainz (3.92 kg), at UCLA (1.3 kg), and at National Museum in Washington, DC (1 kg). A number of smaller pieces have been distributed elsewhere.

Mineral List

12 valid minerals.

Meteorite/Rock Types Recorded

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Clarke Jr, R. S. - Editor (1972). The Meteoritical Bulletin, No. 51. Meteoritics 7(2): 215-232 (June 1972).
Mason, B. & Jarosewich, E. (1973) The Barea, Dyarrl Island, and Emery meteorites, and a review of the mesosiderites: Mineralogical Magazine 39 (302): 202-215. (June 1973)
Hewins, R. H., Kulpecz, A. A., Jr., Prinz, M., & Floran, R. J. (1977) Preliminary Observations on Metal-Silicate Relations in the Emery Mesosiderite: Meteoritics 12: 254-257. (Sept 1977)
Nehru, C. E., Hewins, R. H., Garcia, D. J., Harlow, G. E. & Prinz, M. (1978) Mineralogy and Petrology of the Emery Mesosiderite (abstract): Lunar and Planetary Science IX: 799-801. (March 1978)
Floran, R. J. (1978) Silicate petrography, classification, and origin of the mesosiderites - Review and new observations. In: Lunar and Planetary Science Conference, Proceedings XI. Vol. 1, 1053-1081 :New York, Pergamon Press, Inc.
Clarke Jr, R.S. & Scott, E.R.D. (1980) - Tetrataenite—Ordered Fe,Ni, a new mineral in meteorites: American Mineralogist 65 (7 & 8): 624-630. (Jul/Aug 1980)
Mittlefehldt, D. W. (1980) The composition of mesosiderite olivine clasts and implications for the origin of pallasites: Earth and Planetary Science Letters 51 (1): 29-40. (Nov. 1980)
Delaney, J.S., Nehru, C.E. & Prinz, M. (1980) Olivine clasts from mesosiderites and howardites: Clues to the nature of achondritic parent bodies. Lunar and Planetary Science Conference XI: 1073-1087.
Delaney, J. S., Prinz, M., Harlow, G. E., & Nehru, C. E. (1982) Metamorphism in mesosiderites. In: Proceedings of the Lunar and Planetary Science Conference XII . Section 2. p. 1315-1342: New York and Oxford, Pergamon Press.
Crozaz, G. & Zinner, E. (1985) Rare Earth Element Concentrations of Mesosiderite Merrillite: Meteoritics 20 (4): 629-630. (Dec 1985)
Haack, H., Scott, E. R. D., & Rasmussen, K. L. (1992) Mesosiderites: Young Meteorites from the Largest Sampled Asteroid? Meteoritics 27 (3): 229-230. (July 1992)
Ruzicka, A., Boynton, W. V. & Ganguly, J. (1994) Olivine coronas, metamorphism, and the thermal history of the Morristown and Emery mesosiderites: Geochimica et Cosmochimica Acta 58 (12): 2725-2741. (June 1994)
Mittlefehldt, D. W., McCoy, T. J., Goodrich, C. A. & Kracher, A. (1998). Non-chondritic meteorites from asteroidal bodies. In: Planetary Materials (Papike, J. J. [Ed.]): Chapter 4, 195 pages. Mineralogical Society of America: Washington, DC, USA. [See, esp. - Table 41]
Grady, M. M. (2000) Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge, New York, Oakleigh, Madrid, Cape Town. 690 pages.
Grady, M. M, Pratesi, G. & Cecchi, V. M. (2015) Atlas of Meteorites (5/e). Cambridge University Press: Cambridge, UK. 373 pages.

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