Lamont meteorite, Lamont, Greenwood Co., Kansas, USA
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|Latitude & Longitude (WGS84):||38° 4' 40'' North , 96° 1' 35'' West|
|Latitude & Longitude (decimal):||38.07778,-96.02639|
|Non-native locality type:||Meteorite|
|Meteorite Class:||Mesosiderite meteorite|
|Meteoritical Society Class:||Mesosiderite|
|Metbull:||View entry in Meteoritical Bulletin Database|
|Köppen climate type:||Cfa : Humid subtropical climate|
Find, 1940; 38.69 kg
Around 1940 a 38.69 kg meteorite was found among stones in a fence row. The discovery, however, was not officially announced until 1997. The meteorite is a somewhat unusual mesosiderite with conspicuous large olivine and pyroxene 'megacrysts' (≤2 cm) as well as the usual melange of brecciated pyroxene, plagioclase, and metal found in all mesosiderites. Irregular olivine crystals are in contact with plagioclase and low-Ca pyroxene. Both olivine and pyroxene crystals are characterised by Mg-rich equilibrated cores with some Fe enrichment at the edges. Small chromites forms necklaces around many of the olivines. Within the matrix abundant plagioclase as well as minor amounts of merrillite and tridymite are notable. The suggestion is that the silicates within Lamont formed as early or earlier than the silicates of other mesosiderites.
Lamont is one of 155 mesosiderites listed at The Meteoritical Society's 'Meteoritical Bulletin Database' (June 2015). Approximately half of the mass was distributed to public scientific institutions: the U.S. Museum of Natural History (~7kg), UCLA (~5 kg) and the Field Museum of Natural History (~4kg). An additional 5.339 kg is also at the Southwest Meteorite Laboratory.
Caveat: While the pyroxenes have been given some very sophisticated state of the art treatment, the meteoritic iron has been virtually ignored in the literature cited by NASA ADS.
8 valid minerals.
Meteorite/Rock Types Recorded
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Boesenberg, J. S., Delaney, J. S. & Prinz, M. (1997) Magnesian megacrysts and matrix in the mesosiderite Lamont: Lunar and Planetary Science Conference XXVIII: 125-126. [pdf#1491]. (Mar 1997)
Grossman, J. N. [Editor] (1997). The Meteoritical Bulletin, No. 81, 1997 July. Meteoritics & Planetary Science 32(4, Supplemental): A159-166. (July 1997).
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]
Ruzicka, A., Boesenberg, J. S., Snyder, G. A., Prinz, M. & Taylor, L. A. (1999) Petrogenesis of the Lamont Mesosiderite: Evidence from Petrography and Pyroxene Clast Zoning Systematics (abstract). Lunar and Planetary Science Conference XXX: pdf#1513. (Mar 1999)
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.