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Northwest Africa 15271
Basic information Name: Northwest Africa 15271
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15271
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 467 g
Classification
  history:
Recommended:  LL3.15    [explanation]

This is 1 of 17 approved meteorites classified as LL3.15.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 1 Oct 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15271 (NWA 15271)

(Northwest Africa)

Purchased: 2022

Classification: Ordinary chondrite (LL3.15)

History: Purchased in 2022 by Edwin Thompson from a meteorite dealer in Mauritania. Later purchased by Paul Stahura.

Physical characteristics: Two weathered pieces (240.4 g and 165.6 g) with minor dark-brown fusion crust.

Petrography: (D. Sheikh, Cascadia) Sample is a chondrite composed of well-defined chondrules (Average apparent diameter ~1.1±0.5 mm) containing both primary and devitrified glass, set within a mostly opaque matrix. Accessory phases identified include troilite and kamacite.

Geochemistry: Olivine (Fa20.1±8.2, range Fa1.2-39.0, n=59), Cr2O3 in ferroan olivine (0.19±0.13 wt%, range 0.06-0.55, n=56), Low-Ca Pyroxene (Fs12.4±18.6Wo1.1±1.1, range Fs1.6-33.5Wo0.2-5.4, n=36).

Classification: Ordinary Chondrite (LL3.15). LL group suggested from average chondrule diameter; subtype 3.15 estimated due to mean Cr2O3 value and standard deviation from ferroan olivines according to (Grossman and Brearley, 2005), similar to Y-791324.

Specimens: 48.75 grams at Cascadia, main mass with Paul Stahura.

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2022
Mass (g):466.8
Pieces:2
Class:LL3.15
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):20.1±8.2
Ferrosilite (mol%):12.4±8.6
Wollastonite (mol%):1.1±1.1
Classifier:D. Sheikh, Cascadia
Type spec mass (g):48.75
Type spec location:Cascadia
Main mass:Paul Stahura
Comments:CML 1605; submitted by Daniel Sheikh
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)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9128 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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