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Northwest Africa 11576
Basic information Name: Northwest Africa 11576
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11576
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 18 kg
Meteoritical Bulletin:  MB 107  (2018)  Eucrite-melt breccia
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 107 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 22 Jan 2018
Writeup from MB 107:

Northwest Africa 11576 (NWA 11576)

(Northwest Africa)

Purchased: 2017

Classification: HED achondrite (Eucrite, melt breccia)

History: Reportedly found in Mali, September 2017, purchased in Morocco.

Physical characteristics: Single stone, no fusion crust, exterior shows numerous light colored clasts set in a dark matrix of shock melt.

Petrography: (C. Agee, UNM) Microprobe examination shows basaltic clasts with approximately 60% pyroxene and 35% plagioclase grains most in the range 100-200 μm. Many pyroxene grains have exsolution lamellae.

Geochemistry: (C. Agee, UNM) Low-Ca pyroxene Fs62.1±1.1Wo2.7±0.8, Fe/Mn=32±1, n=7; high-Ca pyroxene Fs28.3±1.6Wo42.2±1.8, Fe/Mn=31±1, n=6; plagioclase An88.9±0.4, n=3.

Classification: Eucrite-melt breccia, eucrite clasts are consistent with type 6 (Takeda and Graham, 1991) showing clear compositional separation of low and high calcium pyroxenes.

Specimens: 24.5 g on deposit at UNM, Mohamed Aid holds the main mass.

  • H. Takeda and A.L. Graham (1991) Degree of equilibration of eucritic pyroxenes and thermal metamorphism of the earliest planetary crust. Meteoritics 26 129-134. (link)
Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2017
Mass (g):18000
Class:Eucrite-melt breccia
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):62.1±1.1, 28.3±1.6
Wollastonite (mol%):2.7±0.8, 42.2±1.8
Classifier:C. Agee, UNM
Type spec mass (g):24.5
Type spec location:UNM
Main mass:Mohamed Aid
Comments:Field name AID 125; submitted by C. Agee, UNM
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Photos from the Encyclopedia of Meteorites:
Sergey Vasiliev   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Antonello Petriccione   
Domjan Svilkovic   
Lucian Cojocaru         
Qi Lv            
Ryan Upchurch   
Stefano Prosperi   
Wojciech Moscinski   
Woreczko Jan & Wadi            

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

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