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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 371 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 Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7885 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

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