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Northwest Africa 8538
Basic information Name: Northwest Africa 8538
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8538
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 995 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  LL6-melt breccia
Recommended:  LL6-melt breccia    [explanation]

This is 1 of 8 approved meteorites classified as LL6-melt breccia.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 3 Oct 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8538 (NWA 8538)

Northwest Africa

Purchased: 2014

Classification: Ordinary chondrite (LL6, melt breccia)

History: One stone weighing 994.8 g was found in Morocco and purchased by Reed in July 2014.

Physical characteristics: Black fusion crust covers 65% of the irregular-shaped stone. The interior shows several different types of clasts crosscut by a prominent melt vein.

Petrography: Description and classification (A. Love, App): Sample is a breccia composed of ~3.5 cm irregular to rounded clasts of two recrystallized chondritic lithologies (one showing distinct shock and weathering characteristics from the other) surrounded by ~1.0 cm melt veins composed of vesicular, clast-laden shock-melt material. Relict chondrules within the clasts have an average diameter of 683 μm. One cellular-textured mixed metal nodule was observed.

Geochemistry: (A. Love, App) Clasts and melt material approach uniform composition. Fa30.4±0.7, n=19; low Ca pyroxene Fs26.2±0.5Wo2.4±0.4, n=12.

Classification: Ordinary Chondrite (LL6-melt breccia, S4, W3)

Specimens: 25.52 g and 2 polished thin sections and a polished mount are on deposit at App.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2014
Mass (g):994.8
Pieces:1
Class:LL6-melt breccia
Shock stage:S4
Weathering grade:W3
Fayalite (mol%):30.4±0.7 (N=19)
Ferrosilite (mol%):26.2±0.5 (N=12)
Wollastonite (mol%):2.4±0.4
Classifier:A. Love, App
Type spec mass (g):25.52
Type spec location:App
Main mass:Blaine Reed
Finder:Anonymous
Comments:Submitted by Anthony Love
Institutions
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6916 approved meteorites from (Northwest Africa) (plus 2027 unapproved names)

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