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Northwest Africa 11176
Basic information Name: Northwest Africa 11176
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11176
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 114.6 g
Meteoritical Bulletin:  MB 106  (2018)  LL5
Recommended:  LL5    [explanation]

This is 1 of 3182 approved meteorites (plus 1 unapproved name) classified as LL5.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 18 Feb 2017
Writeup from MB 106:

Northwest Africa 11176 (NWA 11176)

(Northwest Africa)

Purchased: 2015

Classification: Ordinary chondrite (LL5)

History: A 114.6 g meteorite was acquired from a Moroccan meteorite dealer at the 2015 Tucson Gem and Mineral show.

Physical characteristics: Angular stone, one side shows well-developed fusion crust. The sawn surface is light colored with patches of iron-oxide staining. Even distribution of metal grains approximately 0.5-mm in size, troilite grains most approximately 1 mm in size, with some to 3 mm, and well developed chondrules, with average diamieter of 1.16 mm based on measurements of 32 chondrules. Metal and troilite are sparse at approximately one aerial percent of the sample.

Petrography: (J. Barkl, L. Garvie ASU) Range of chondrule types visible in the thin section, including radial olivine, RP, BO, PO, and CC; several in the 3 to 4 mm size range. Matrix fine-grained and recrystallized with abundant feldspar to 50 μm. Accessory angular and fractured chromite to 150 μm. Rare tetrataenite grain to 150 μm. Troilite typically polycrystalline and occasionally twined. Kamacite frequently rimmed by tetrataenite showing weakly developed Newman bands. Kamacite shows only minor weathering.

Geochemistry: (A. Wittmann, J. Barkl, L. Garvie ASU) Olivine Fa30.1±0.8, FeO/MnO = 61.6±7.8, n=10; Low Ca-pyroxene Fs25.2±1.7Wo1.8±0.1, FeO/MnO=37.4±6.9, n=4. Plagioclase An12.6±0.6Or5.9±1.1, n = 3. Two kamacite analyses: Ni 4.8 at%, Co 3.3 at%; and, Ni 3.8 at%, Co 3.6 at%. Taenite, Ni 35.8±2.6 at%, Co 1.7 at%, n=10.

Classification: Ordinary chondrite (LL5), S3, W2.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2015
Mass (g):114.6
Shock stage:S3
Weathering grade:W2
Fayalite (mol%):30.1±0.8
Ferrosilite (mol%):25.2±1.7
Wollastonite (mol%):1.8±0.1
Classifier:J. Barkl, ASU
Type spec mass (g):114.6
Type spec location:ASU
Main mass:ASU
Comments: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 Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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