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Northwest Africa 13693 | |||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13693 This is an OFFICIAL meteorite name. Abbreviation: NWA 13693 Observed fall: No Year found: 2017 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 11 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 21 Feb 2021 | ||||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 110:
Northwest Africa 13693 (NWA 13693) (Northwest Africa) Purchased: 2017 Classification: Ordinary chondrite (LL3.15) History: Purchased in Tucson in 2017 by Nicholas Gessler from a Moroccan meteorite dealer. Physical characteristics: Sub-rounded specimen, broken into 5 pieces, completely covered with relict fusion crust. Petrography: (D. Sheikh, FSU) Specimen is composed of well-defined chondrules (Av. 800±100 µm, n=28) and a few clasts (up to 4 mm, n=3) set in a primarily opaque matrix. Most chondrules preserve their primary isotropic glassy mesostasis, although some contain devitrified mesostasis. Geochemistry: Olivine (Fa15.2±9.1, range Fa1.1-38.7, CaO wt% =0.15±0.07, n=39), Cr2O3 in ferroan olivine (0.25±0.09, range 0.05-0.42, n=34), Low-Ca Pyroxene (Fs8.3±6.7Wo0.7±0.5, range Fs0.9-29.1Wo0.2-2.0, n=21). Classification: Ordinary chondrite (LL3.15). LL group is due to average chondrule diameter and magnetic susceptibility (low value due to weathering). Subtype is estimated to be 3.15 based on 1) mean Cr2O3 value and standard deviation of ferroan olivines (Grossman and Brearley, 2005), 2) The presence of a primarily opaque matrix and primary isotropic glass mesostasis in most chondrules, 3) The large observed range in Fa, Fs, and CaO concent of olivines (Huss et al., 2006). Specimens: 24 grams at UCLA, main mass with Nicholas Gessler. | ||||||||||||||||||||||||||||||||
Bibliography: |
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Data from: MB110 Table 0 Line 0: |
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Institutions and collections |
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011) FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010) Gessler: Nicholas Gessler, 2010 Calgary Lane, Los Angeles, CA 90077, United States (private address; updated 7 Jul 2016) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Geography: |
Statistics: This is 1 of 7579 approved meteorites from (Northwest Africa) (plus 1969 unapproved names) |