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Northwest Africa 10516
Basic information Name: Northwest Africa 10516
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10516
Observed fall: No
Year found: 2002
Country: (Northwest Africa)
Mass:help 8 g
Meteoritical Bulletin:  MB 105  (2016)  L3-6
Recommended:  L3-6    [explanation]

This is 1 of 63 approved meteorites classified as L3-6.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 27 Feb 2016
Writeup from MB 105:

Northwest Africa 10516 (NWA 10516)

(Northwest Africa)

Purchased: 2002 Feb

Classification: Ordinary chondrite (L3-6)

History: Donated to Cascadia by Edwin Thompson, who obtained the meteorite in February 2002 at the Tucson Gem and Mineral Show from a Moroccan trader.

Physical characteristics: Stone with brown-red weathering patina covering both broken and curved surfaces; the latter contains remnant fusion crust. Polished cut face shows apparent breccia texture with small patches of dark, apparent shock melt and one truncated shock vein.

Petrography: (A. Ruzicka and K. Farley, Cascadia) In thin section, a breccia composed of an intimate mixture of mineral and chondrule fragments with diverse (type 3-6) characteristics and some larger clasts; areas between chondrules are mainly composed of smaller chondrule and mineral fragments, although rare fine-grained matrix is present in places. BSE imaging shows that most of the rock (“host”) is composed of type 4-6 lithologies, with equilibrated olivine, and coarse plagioclase (30-150 μm long, one grain up to 460 μm long), intermixed with well-defined chondrules and fragments, some glass-bearing. Contains a 4 mm long granoblastic-textured (type 6) chondritic lithic clast.

Geochemistry: (K. Farley and A. Ruzicka, Cascadia) Host dominated by equilibrated olivine (median Fa24.2, N=55) and low-Ca pyroxene (median Fs20.7, N=52) but also contains more varied olivine (Fa5.8-32.5) and low-Ca pyroxene compositions (Fs2.9-38.7). Overall average of mixture including both equilibrated and more varied compositions is olivine (Fa23.4±4.9, N=55), low-Ca pyroxene (Fs18.0±6.4Wo1.1±1.0En80.9±6.8, N=52), Ca-rich pyroxene (Fs7.2±2.6Wo42.1±4.4En50.7±7.0, N=4), plagioclase (Ab82.0±1.2Or9.0±4.3An10.9±1.6, N=7), alkali feldspar (Ab83.1±1.2Or42.9±2.0An9.6±0.9, N=3).

Classification: L3-6 finely intermixed genomict breccia. Type 5-6 lithology implied by abundant equilibrated olivine and pyroxene and common coarse feldspar grain sizes; type 3 lithology implied by presence of magnesian olivine and glass in chondrules and clasts.

Specimens: Cascadia holds the entire sample, consisting of 7.0 g in two pieces, a polished thin section, and a potted butt.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2002 Feb
Mass (g):8
Shock stage:S5
Weathering grade:W1
Classifier:K. Farley and A. Ruzicka, Cascadia
Type spec mass (g):7.0
Type spec location:Cascadia
Main mass:Cascadia
Comments:Lab number CML0020; submitted by A. Ruzicka
   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)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)
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 9806 approved meteorites from (Northwest Africa) (plus 1855 unapproved names)

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