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Conception Junction | |||||||||||||||||||||||||||||||
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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: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 16 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![]() |
Writeup from MB 100:
Conception Junction 40°16’N, 94°41’W (both ±5') Missouri, USA Found: 2006 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 RWard . | ||||||||||||||||||||||||||||||
Data from: MB100 Table 1 Line 63: |
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Institutions and collections |
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011) RWard: No contact information provided. (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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Photos: |
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Geography:![]() |
Statistics: This is 1 of 24 approved meteorites from Missouri, United States (plus 2 unapproved names) (plus 2 impact craters) This is 1 of 1919 approved meteorites from United States (plus 867 unapproved names) (plus 28 impact craters) | ||||||||||||||||||||||||||||||
Proximity search: |