|Basic information||Name: Conception Junction|
This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2006
Country: United States
Mass: 17 kg
This is 1 of 11 approved meteorites classified as Pallasite, PMG-an. [show all]
Search for other: Main group pallasites, Metal-rich meteorites, and Pallasites
|Comments:||Approved 27 Aug 2011|
Writeup from MB 100:
Conception Junction 40°16’N, 94°41’W (both ±5')
Classification: Pallasite (Main group, anomalous)
History: A single mass was discovered protruding from a hillside near Conception Junction, Missouri.
Physical characteristics: The exterior of the meteorite is weathered. Much of the interior shows only minor oxidation.
Petrography: Meteorite has a typical main-group pallasite (PMG) structure with roughly equal portions of metal and silicate. The olivine masses are slightly rounded, though a few surfaces show sharply defined angles. Olivines show millimeter-scale fractures. Schreibersite is rare, perhaps 0.5% of the exposed (25 cm2 surface). Minor FeS.
Geochemistry: Compositional data: Co 6.0 mg/g; Ni 79 mg/g; Ga 24 μg/g; Ge ~80 μg/g; As 29 μg/g; Ir 0.50 μg/g; Au 2.39 μg/g. Data are the mean of duplicate determinations. The composition of the metal differs in detail from other pallasites. For example, the Ir concentration is 0.50 ug/g, with the nearest relative Seymchan at 0.67 μg/g and Barcis at 0.32 μg/g.
Classification: On element-Au diagrams, Conception Junction plots distinctly lower than most PMG on Ni and Cu and above most PMG on Co, Ga, As, and Ir diagrams; it is therefore classified as PMG-anomalous (PMG-an). Its Ni and Cu contents are the lowest known for PMG. Its nearest PMG-an neighbor on most diagrams is Krasnojarsk. The low Ni and high Co could reflect unrepresentative sampling of kamacite and taenite but these are the means of two replicates.
Specimens: 113.58 g type specimen, UCLA. Main mass, Karl Aston, Dave Gheesling and Robert Ward
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
Ward: No contact information provided. (private address)
|References:||Published in Meteoritical Bulletin, no. 100, MAPS 46, in preparation (2013)|
This is 1 of 23 approved meteorites from Missouri, United States (plus 2 unapproved names) (plus 2 impact craters)
This is 1 of 1708 approved meteorites from United States (plus 229 unapproved names) (plus 28 impact craters)
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