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Northwest Africa 13997
Basic information Name: Northwest Africa 13997
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13997
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 123.9 g
Classification
  history:
Recommended:  LL3    [explanation]

This is 1 of 441 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 31 May 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13997 (NWA 13997)

(Northwest Africa)

Purchased: 2020 Mar

Classification: Ordinary chondrite (LL3)

History: Purchased in March 2020 by Fabien Kuntz from a meteorite dealer in Morocco.

Physical characteristics: Three weathered stones with minor fusion crust.

Petrography: (D. Sheikh, Cascadia) This sample is an ordinary chondrite containing abundant chondrules (850±100 µm, n=20) set in a mostly fine-grained, slightly opaque matrix. Accesory phases include troilite and Fe-Ni metal.

Geochemistry: Olivine (Fa21.0±5.1, range Fa14.5-31.2, n=21), Cr2O3 in ferroan olivine (Cr2O3 = 0.19±0.08 wt. %, n=16), Low-Ca Pyroxene (Fs15.5±10.6Wo0.8±0.6, range Fs2.2-35.2Wo0.2-1.7, n=9).

Classification: Ordinary chondrite (LL3) based on range in Fa and Fs, and on average chondrule diameter.

Specimens: 20.1 g and a thin section at Cascadia; main mass with Fabien Kuntz.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020 Mar
Mass (g):123.9
Pieces:1
Class:LL3
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):21.0±5.1
Ferrosilite (mol%):15.5±10.6
Wollastonite (mol%):0.8±0.6
Classifier:D. Sheikh, Cascadia
Type spec mass (g):20.1
Type spec location:Cascadia
Main mass:Fabien Kuntz
Comments: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)
Kuntz: Fabien Kuntz, France; Website (private address)
Catalogs:
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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