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| Northwest Africa 13090 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 13090 This is an OFFICIAL meteorite name. Abbreviation: NWA 13090 Observed fall: No Year found: 2019 Country: Morocco Mass:  1182 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 469 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 |
Writeup from MB 109:
Northwest Africa 13090 (NWA 13090) Morocco 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: MB109 Table 0 Line 0: |
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| 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) 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) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography:
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Statistics: This is 1 of 2012 approved meteorites from Morocco (plus 35 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||