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Northwest Africa 13090
Basic information Name: Northwest Africa 13090
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13090
Observed fall: No
Year found: 2019
Country: Morocco
Mass:help 1182 g
Meteoritical Bulletin:  MB 109  (2020)  LL3
Recommended:  LL3    [explanation]

This is 1 of 492 approved meteorites classified as LL3.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 18 Jan 2020
Writeup from MB 109:

Northwest Africa 13090 (NWA 13090)


Purchased: 2019 Mar 27

Classification: Ordinary chondrite (LL3)

History: Purchased in Morocco by a friend of Mr. Jason Phillips, who sent a half of the stone to Mr. James Tobin, who sent pieces to the Cascadia for classification.

Physical characteristics: Cascadia received an end cut and a small corner piece; exterior surfaces of both are abraded, dark gray, and bumpy, with lighter-colored chondrules visible. The cut face shows well-defined, oblate, and aligned chondrules set against a medium-gray background. Sulfide and metal are visible, mainly rimming chondrules. Two perpendicular faces are visible on the corner piece; chondrules are oblate and aligned on only one face.

Petrography: (M. Hutson and A. Ruzicka, Cascadia): Chondrules are distinct, and have an apparent mean diameter of 0.99±0.46 mm (N= 36). Many chondrules are surrounded by rims of mainly sulfide. Fe-Ni metal comprises 2.1% of the thin section. Native copper is present. Visible in thin section are brown glass, low-Calcium clinopyroxene, and zoned olivine grains, as well as "bleached" rims on some chondrules. BSE imaging shows many examples of forsteritic olivine cut by linear bands of Fe-rich olivine that appear to represent pre-terrestrial alteration along fractures.

Geochemistry: Mineral compositions and geochemistry: Olivine and pyroxene grains are unequilibrated: Fa25.3±9.0N=157; Fs12.8±9.5Wo0.9±0.8, N=33.

Classification: Ordinary chondrite (LL3) based on olivine fayalite content, metal abundance, and mean chondrule diameter.

Specimens: Cascadia holds 33.0 g in two pieces, in addition to a polished thin section and a mounted butt. The main mass was divided in half: Jason Phillips holds 571.2 g; James Tobin holds 540.8 g.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019 Mar 27
Mass (g):1182
Shock stage:S3
Weathering grade:W1
Fayalite (mol%):25.3±9.0 (N=157)
Ferrosilite (mol%):12.8±9.5 (N=33)
Wollastonite (mol%):0.9±0.8 (N=33)
Classifier:M. Hutson and A. Ruzicka, Cascadia
Type spec mass (g):33.0
Type spec location:Cascadia
Main mass:JPhillips and JTobin
Comments:Lab number CML 1170; submitted by Melinda Hutson
   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)
Tobin: J. Tobin, The Meteorite Exchange, PMB #455, P.O. Box 7000, Redondo Beach, CA 90277, United States (private address)
JTobin: The Meteorite Exchange, Inc., United States; Website (private address; updated 28 Aug 2013)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 2089 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater)

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