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Northwest Africa 12751
Basic information Name: Northwest Africa 12751
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12751
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 223 g
Classification
  history:
Recommended:  LL3.1    [explanation]

This is 1 of 8 approved meteorites classified as LL3.1.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 11 Oct 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12751 (NWA 12751)

(Northwest Africa)

Purchased: 2018

Classification: LL3.10/3.15

History: Marc Jost purchased the stone from a Moroccan dealer at the 2018 Ensisheim show June 16, 2018.

Physical characteristics: The 223 g sample has a brown, weathered exterior with an irregular, tabular shape containing some broad, shallow regmaglypts. The fusion crust appears to be weathered. The cut face shows the interior is a breccia composed of clasts of various lithologies set within a host of flattened chondrules that define a foliation.

Petrography: Description and Classification (A. Love, App) Sample is a breccia composed of sparse rounded clasts set within a host of densely-packed, unequilibrated, elongated chondrules (avg. dia. 741 µm, N=66; aspect ratio = 1.48) that define a foliation. Chondrule mesostasis contains devitrified glass. Isotropic glass is rare. Chondrules commonly contain mesostasis that displays yellow CL (43%) and blue CL (57%) N=103. Clinoenstatite is the dominant pyroxene. The sample contains a matrix-rich (84 vol%) chondritic xenolith dominated by poikolitic clinoenstatite chondrules (avg. dia. 451 µm, N=13) with bluish green mesostasis.

Geochemistry: (A. Love, App) Host: Olivine Fa16.0±8.8 (Fa0.5-33.8), Fe/Mn=39.7±15.2, mean Cr2O3 in ferroan olivine=0.3±0.2 (0.0-0.6), N=30; low Ca pyroxene Fs16.0±8.2Wo0.9±1.0 (Fs2.8-29.6Wo0.2-3.9), N=10. Clast 1: Olivine Fa4.8±1.4 (Fa3.1-6.5), Fe/Mn=12.1±4.7, N=4; low Ca pyroxene Fs7.7±4.7Wo1.3±2.3 (Fs2.9-14.6Wo0.2-5.5), Fe/Mn=37.4, N=5.

Classification: Ordinary Chondrite (LL3.10/3.15, xenolithic breccia) Based on chondrule size and magnetic susceptibility this sample is an LL ordinary chondrite. CL observations indicate type 3.1 (Huss et al., 2006) and mean and standard deviation of Cr2O3 in ferroan Ol is at the limit between 3.10 and 3.15 (Grossmann and Brearley, 2005). Sample contains a xenolithic chondritic clast of unknown affinity.

Specimens: Marc Jost (SJS) holds the main mass. 3 slices weighing 26.7 g and a polished thin section and mount are on deposit at App.

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Ensinsheim Meteorite Show
Date:P 2018
Mass (g):223
Pieces:1
Class:LL3.1
Shock stage:C-S3
Weathering grade:W2
Fayalite (mol%):16.0±8.8; 4.8±1.4
Ferrosilite (mol%):16.0±8.2; 7.7±4.7
Wollastonite (mol%):0.9±1.0; 1.3±2.3
Magnetic suscept.:4.50
Classifier:A. Love, App
Type spec mass (g):26.7
Type spec location:App
Main mass:Marc Jost (SJS)
Finder:Unknown
Comments:Submitted by Anthony Love
Institutions
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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