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Northwest Africa 13254
Basic information Name: Northwest Africa 13254
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13254
Observed fall: No
Year found: 2019
Country: Morocco
Mass:help 237 g
Recommended:  LL3    [explanation]

This is 1 of 462 approved meteorites classified as LL3.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 7 Mar 2020
Writeup from MB 109:

Northwest Africa 13254 (NWA 13254)


Purchased: 2019

Classification: Ordinary chondrite (LL3)

History: Marc Jost (SJS) purchased the sample from a Moroccan dealer at the Ensisheim show in June 2019.

Physical characteristics: Sample is rounded to irregular in shape and has a dark-brown, wind ablated surface. The cut face shows the sample is composed of numerous, closely packed, dark and light colored chondrules surrounded by sulfide rims.

Petrography: Description and classification (A. Love, App) Sample displays chondritic texture composed of closely packed, well defined, chemically zoned chondrules (with an average apparent diameter of 775 μm, n=80), surrounded by fine-grained, opaque rims. Chondrules with devitrified mesostasis are more abundant than those with clear isotropic glass.

Geochemistry: (A. Love, App) Olivine, Fa16.2±11.6 (Fa0.3-38.6), Fe/Mn=45.9±21.4, n=25. Cr2O3 in type II chondrules has an average of 0.1 wt% with a standard deviation of 0.0, n=23); low-Ca pyroxene, Fs12.6±8.1Wo1.0±0.7 (Fs1.7-3.0Wo0.3-2.7), n=12.

Classification: Ordinary chondrite (LL3, C-S2, W1) Based on chondrule size and magnetic susceptibility this sample is an LL chondrite. Estimated subtype for this sample is 3.5 based on unequilibrated compositions, presence of isotropic glass mesostasis (3.4-3.5), lack of yellow CL in chondrule mesostasis (>3.4) and presence of red luminescence in chondrule olivine (>3.1, <3.6).

Specimens: Marc Jost (SJS) holds the main mass. A 24.6 g endcut and a polished thin section are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Ensisheim
Date:P 2019
Mass (g):236.8
Shock stage:C-S2
Weathering grade:W1
Fayalite (mol%):16.2±11.6
Ferrosilite (mol%):12.6±8.1
Wollastonite (mol%):1.0±0.7
Magnetic suscept.:3.83
Classifier:A. Love, App
Type spec mass (g):24.6
Type spec location:App
Main mass:Marc Jost (SJS)
Comments:Submitted by Anthony Love
   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)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
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     This is 1 of 1991 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

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