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Northwest Africa 13089
Basic information Name: Northwest Africa 13089
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13089
Observed fall: No
Year found: 2019
Country: Morocco
Mass:help 479 g
Meteoritical Bulletin:  MB 109  (2020)  LL5
Recommended:  LL5    [explanation]

This is 1 of 3298 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 Jan 2020
Writeup from MB 109:

Northwest Africa 13089 (NWA 13089)


Purchased: 2019 Mar 27

Classification: Ordinary chondrite (LL5)

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 two slices; an abraded, bumpy exterior is visible along the slices’ edges. Cut faces show readily distinguished, mainly dark-colored chondrules and flecks of metal and sulfide set in an orange-brown background.

Petrography: (M. Hutson and A. Ruzicka, Cascadia): Chondrules are readily distinguished, and many are surrounded by partial rims of mainly sulfide. Albitic feldspar grains up to 20 microns across are present. In addition to single grains, chromite-plagioclase-rich mesostases were observed in several chondrules.

Geochemistry: Mineral compositions and geochemistry: Olivine and pyroxene grains are equilibrated: Fa29.0±0.2, N=36; Fs23.7±0.3Wo1.4±0.4, N=26. Limited data were collected on feldspars in two areas: Ab85.2±3.0An10.3±1.7Or4.5±1.8, N=5.

Classification: Ordinary chondrite (LL5) based on olivine fayalite and pyroxene ferrosilite contents, and feldspar grain size.

Specimens: Cascadia holds 24.3 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 219.1 g; James Tobin holds 218.6 g.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019 Mar 27
Mass (g):479
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):29.0±0.2 (N=36)
Ferrosilite (mol%):23.7±0.3 (N=26)
Wollastonite (mol%):1.4±0.4 (N=26)
Classifier:M. Hutson and A. Ruzicka, Cascadia
Type spec mass (g):24.3
Type spec location:Cascadia
Main mass:JPhillips and JTobin
Comments:Lab number CML 1169; 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 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

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