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Northwest Africa 11551
Basic information Name: Northwest Africa 11551
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11551
Observed fall: No
Year found: 2017
Country: Mauritania
Mass:help 447 g
Classification
  history:
Recommended:  Howardite    [explanation]

This is 1 of 356 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 5 Jan 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11551 (NWA 11551)

Mauritania

Purchased: 2017 Jan 30

Classification: HED achondrite (Howardite)

History: Type specimen donated to Cascadia by Mohammed Hmani at the Tucson Gem Show in 2017. Mr. Hmani stated that the meteorite was found in 2014 in Mauritania.

Physical characteristics: Exterior surfaces partly covered by black fusion crust; non-crusted surfaces show obvious breccia texture with variegated clasts up 1o 1 cm across. Most surfaces appear relatively unweathered but rust spots are present

Petrography: In thin section appears to be a roughly 50-50 mixture of diogenitic (coarse orthopyroxene) and eucritic (plagioclase, pyroxene-dominated) clasts. Some eucritic pyroxene shows zoning.

Geochemistry: Diogenitic orthopyroxene Fs27.1±3.8Wo2.4±1.0 (N=182), eucritic low-Ca pyroxene Fs41.6±6.0Wo3.1±1.0 (N=40), augite Fs26.8±7.8Wo41.5±2.5 (N=30), uninverted pigeonite Fs48.8±5.8Wo8.0±2.3 (N=36), bulk inverted pigeonite Fs50.5±5.4Wo10.7±3.0 (N=24).

Classification: Howardite based on textures and mineral proportions.

Specimens: Cascadia holds 20.0 g and two polished thin sections and a potted butt. The main mass is held by HMANI Inc. (13 Rue Joules Hardouin Mansart, 92600 Asnieres, France).

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2017 Jan 30
Mass (g):446.9
Pieces:1
Class:Howardite
Weathering grade:minor
Ferrosilite (mol%):27.1±3.8, 41.6±6.0
Wollastonite (mol%):2.4±1.0, 3.1±1.0
Classifier:M. Hutson, A. Ruzicka, Cascadia
Type spec mass (g):20.0
Type spec location:Cascadia
Main mass:HMANI Inc
Comments:Lab number CML0928; submitted by A. Ruzicka
Institutions
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
Hmani: A. Hmani Moroccan Imports, 13 rue Jules Hardouin Mansart, 92600 Asnières, France (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
Alex Ruzicka   
Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 88 approved meteorites from Mauritania (plus 2 impact craters)

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