MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 15 Jul 2024
Search for: Search type: Search limits: Display: Publication:
Text help
Starts with
Sounds like
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
Northwest Africa 8141
Basic information Name: Northwest Africa 8141
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8141
Observed fall: No
Year found: 2002
Country: (Northwest Africa)
Mass:help 45 g
Meteoritical Bulletin:  MB 102  (2013)  L3-6
Recommended:  L3-6    [explanation]

This is 1 of 63 approved meteorites classified as L3-6.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 10 Dec 2013
Writeup from MB 102:

Northwest Africa 8141 (NWA 8141)

(Northwest Africa)

Purchased: May 24, 2002

Classification: Ordinary chondrite (L3-6)

History: Edwin Thompson obtained the specimen from a Moroccan trader in February 2002 and donated it to Cascadia on May 24, 2005.

Physical characteristics: The specimen has lumps and pits and a dark shiny weathering patina.

Petrography: (K. Armstrong and A. Ruzicka, Cascadia) Brecciated chondritic texture, containing regions with distinct chondrules and opaque matrix, and clasts with granoblastic texture and moderately coarse feldspar (15 μm to 52 μm across). No chondrules are apparent in the largest granoblastic clast, consistent with type 6. Chondrule size is 0.65±0.23 mm (N=27). Metal and troilite abundance determined by pixel counting is 4 and 5 area%, respectively.

Geochemistry: Phase compositions are variable in areas with distinct chondritic texture and less variable in more granoblastic areas. Distinct chondritic texture: olivine Fa21.1±10.1, Fe/Mn = 50.1±21.6 (N=29) and low-Ca pyroxene Fs13.3±7.0Wo1.1±1.1, Fe/Mn = 23.2±10.7 (N=15). Largest granoblastic clast: olivine Fa25.3±0.6, Fe/Mn = 49.1±6.9 (N=9) and low-Ca pyroxene Fs19.6±3.4Wo2.0±1.3, Fe/Mn = 31.7±7.5 (N=12).

Classification: Textures, mineral compositions, and metal abundances are consistent with a L3-6 genomict breccia.

Specimens: A 42.6 g piece, polished thin section, small fragment, and butt are on deposit at Cascadia.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, Arizona
Date:P May 24, 2002
Mass (g):45
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):21.1±10.1, 25.3±0.6
Ferrosilite (mol%):13.3±7.0, 19.6 ±3.4
Wollastonite (mol%):1.1±1.1, 2.0±1.3
Classifier:K. Armstrong and A. Ruzicka, Cascadia
Type spec mass (g):42.6
Type spec location:Cascadia
Main mass:Cascadia
Comments:Lab number CML0014; submitted by A. Ruzicka
   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)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
Find references in Google Scholar:

     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Direct link to this page