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Northwest Africa 13966
Basic information Name: Northwest Africa 13966
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13966
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 183.9 g
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 263 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 23 May 2021
Writeup from MB 110:

Northwest Africa 13966 (NWA 13966)

(Northwest Africa)

Find: 2016

Classification: HED achondrite (Eucrite, monomict)

History: A single stone acquired by Michael Farmer from a Moroccan meteorite dealer at the 2016 Tucson Gem and Mineral show.

Physical characteristics: (L. Garvie, ASU): Blocky, relatively fresh, fusion crusted stone. A 4 × 3 cm polished end-piece shows a coarse-grained texture, with mm-sized plagioclase and pyroxene. One 2 × 1 cm clast shows several prominent olive-green lath-shaped grains to 1 cm. Sparse, <0.2 mm, metal grains are scattered across the section.

Petrography: (M. Marquardt, J. Brown, A. Wittmann, ASU): Fine-grained breccia with coarse ophitic clasts set in the fragmental matrix. The specimen is composed primarily of equal proportions of pyroxene and calcic plagioclase. Plagioclase in the sample is intensely fractured. Throughout the coarse-grained clasts are large, acicular SiO2 laths upwards of 2 mm × 0.04 mm. Pyroxene exhibits sub-µm exsolution lamellae (low-Ca lamellae with high-Ca host). Additionally, some pyroxene show relict concentric zonation with a core composed of augite with a rim composed of pigeonite. The interstitial space between the coarse pyroxene-plagioclase clasts is primarily comprised of fine-grained intergrowths of SiO2, pyroxene, fayalite, and troilite. Accessory minerals are fayalite, ilmenite, chromite, troilite, Fe-metal, fluorapatite, merrillite, and zircon.

Geochemistry: (A. Wittmann, M. Marquardt, J. Brown, ASU): Microprobe analysis of the polished mount shows heterogeneity among pyroxene throughout the sample. Low-Ca pyroxene En43.6±21.1Fs48.3±19.5Wo8.1±5.8 Mg#=47.4±21.8 (n=31); High-Ca pyroxene En26.3±5.9Fs49.1±7.8Wo24.6±9.1 Mg#=34.9±6.4 (n=17); Plagioclase An85.5±9.8Ab13.5±8.6Or0.96±1.2 (n=39); SiO2 (up to 0.52 wt% Al2O3 , n=31).

Specimens: 25 g at ASU.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Mass (g):183.9
Shock stage:low
Weathering grade:low
Classifier:M. Marquardt, J. Brown, A. Wittman, L. Garvie
Type spec mass (g):25
Type spec location:ASU
Main mass:ASU
Comments:ASU#2039; submitted by L. Garvie
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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