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Conception Junction
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:help 17 kg
Meteoritical Bulletin:  MB 100  (2012)  Pallasite, PMG-an 
Recommended:  Pallasite, PMG-an    [explanation]

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 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:
  Table 1
  Line 63:
Mass (g):17000
Class:Pallasite, PMG-an
Weathering grade:minor
Fayalite (mol%):11.7
Classifier:J. T. Wasson, UCLA
Type spec mass (g):113.58
Type spec location:UCLA
Main mass:Aston, RWard, Gheesling
Comments:Submitted by Wasson J. T.
   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)
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Anna Morris   
Dave Gheesling   
KD Meteorites   
Roberto Vargas   
Ryan Upchurch   
Woreczko Jan & Wadi   

United States
     Recommended::   (40° 16'N, 94° 41'W)

     This is 1 of 24 approved meteorites from Missouri, United States (plus 2 unapproved names) (plus 2 impact craters)
     This is 1 of 1927 approved meteorites from United States (plus 866 unapproved names) (plus 28 impact craters)
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