header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 17 Oct 2021
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
Northwest Africa 13091
Basic information Name: Northwest Africa 13091
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13091
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 133.9 g
Classification
  history:
Recommended:  L6    [explanation]

This is 1 of 11582 approved meteorites (plus 10 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 18 Jan 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13091 (NWA 13091)

Morocco

Purchased: 2014 Feb

Classification: Ordinary chondrite (L6)

History: Purchased from a Moroccan dealer in 2013

Physical characteristics: Single stone, Rusty exterior with small patches of fusion crust covering <5%. Saw cut reveals vague outlines of chondrules, some shock melt veins, small flakes of metal and troilite

Petrography: (T. Swindle, UAz) Microprobe examination of a polished mount shows some largely re-crystalized chondrules up to 2 mm in size, in a recrystalized matrix. Plagioclase grains in matrix up to 70 μm in size. Incipient oxidation of troilite, approximately 50% of kamacite weathered. Sample cut by many small iron-oxide weathering veins, and occasional melt veins a few tens of μm in width. Minor chromite present. Some areas with abundant metal blebs.

Geochemistry: Mineral composition and geochemistry (T. Swindle, UAz): Olivine Fa25.3±0.7, Fe/Mn = 46.8±3.3, n=8; low-Ca pyroxene Fs21.1±0.2Wo1.6±0.2, Fe/Mn=27.6±0.7, n=8

Classification: Ordinary Chondrite (L6), Weathering grade W2, weakly shocked (S3)

Specimens: 43.7 g and epoxy mount deposit at UAz. Fredric Stephan holds the main mass.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2014 Feb
Mass (g):133.9
Pieces:1
Class:L6
Shock stage:S3
Weathering grade:W2
Fayalite (mol%):25.3±0.7 (N=8)
Ferrosilite (mol%):21.1±0.2 (N=8)
Wollastonite (mol%):1.6±0.2 (N=8)
Classifier:T. Swindle
Type spec mass (g):43.7
Type spec location:UAz
Main mass:Fredric Stephan
Comments:Working name FS012; submitted by T. Swindle
Institutions
   and collections
UAz: Lunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721, United States (institutional address; updated 14 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1680 approved meteorites from Morocco (plus 25 unapproved names) (plus 1 impact crater)

Direct link to this page