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Northwest Africa 10636
Basic information Name: Northwest Africa 10636
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10636
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 14.14 kg
Meteoritical Bulletin:  MB 105  (2016)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 427 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 7 May 2016
Writeup from MB 105:

Northwest Africa 10636 (NWA 10636)


Purchased: February 2014

Classification: HED achondrite (Howardite)

History: Purchased from Moroccan meteorite dealer in 2014.

Physical characteristics: Physical Characteristics: Single stone covered with thin caliche layer. Saw cut shows finely brecciated texture with white, gray, and black clasts.

Petrography: (K. Domanik and F. Stephan, UAz) Microprobe examination of a polished mount shows a brecciated texture with widely varying clast sizes consisting of approx. 55% basaltic eucrite, 30% cumulate eucrite, and 15% diogenite components. A few large (2 mm) ophitic textured cumulate eucrite fragments are present. Two populations of basaltic pigeonite are observed; the first with extremely fine-scale exsolution lamellae; the second with Fe-enriched rims, no exsolution lamellae, and cross-cutting Fe-rich olivine veins. Accessory silica, chromite, ilmenite, Fe-Ni metal, and minor interstitial melt areas are also present.

Geochemistry: Mineral compositions and geochemistry: (K. Domanik and F. Stephan, UAz) Diogenite minerals: low-Ca pyroxene Fs25.3±3.1Wo2.6±0.9, Fe/Mn=29±3, n=24; olivine Fa33.9, Fe/Mn=50, n=1. Basaltic eucrite minerals: low-Ca pyroxene Fs58.3±3.6Wo2.8±0.6, Fe/Mn=31±1, n=15; pigeonite Fs59.4±6.0Wo7.6±1.5, Fe/Mn=29±3, n=4; zoned pigeonite cores Fs34.5±0.3Wo6.6±1.1, Fe/Mn=29±2, n=17; augite Fs31.9±0.1Wo40.0±3.0, Fe/Mn=33±2, n=2; plagioclase An86.2±1.7Ab13.1±1.6Or0.6±0.2, n=5; olivine veins Fa71.3±5.9 Fe/Mn=43±2, n=3. Cumulate eucrite minerals: low-Ca pyroxene Fs49.1±4.2Wo2.7±0.6, Fe/Mn=30±1, n=16; pigeonite Fs44.9±0.3Wo5.7±0.2, Fe/Mn=27, n=2; augite Fs21.6±2.5Wo42±1.1, Fe/Mn=28±2, n=8; plagioclase An92.5±1.7Ab7.2±1.7Or0.3±0.1, n=6.

Classification: Achondrite (howardite)

Specimens: 42 g including probe mount on deposit at UAz, Fredric Stephan holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, AZ
Date:P February 2014
Mass (g):14140
Shock stage:moderate
Weathering grade:moderate
Fayalite (mol%):33.9
Ferrosilite (mol%):25.3±3.1, 58.3±3.6, 49.1±4.2
Wollastonite (mol%):2.6±0.9, 2.8±0.6, 2.7±0.6
Classifier:K. Domanik and F. Stephan, UAz
Type spec mass (g):42
Type spec location:UAz
Main mass:Fredric Stephan
Comments:Submitted by K. Domanik
   and collections
UAz: Lunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721, United States (institutional address; updated 14 Jan 2012)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     This is 1 of 1904 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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