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Northwest Africa 10640
Basic information Name: Northwest Africa 10640
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10640
Observed fall: No
Year found: 2015
Country: Morocco
Mass:help 41.9 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 218 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 1 Jun 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 10640 (NWA 10640)

Morocco

Purchased: 2015 Sept

Classification: HED achondrite (Eucrite, monomict)

History: A single stone of 41.9 g was found by an anonymous finder in Western Sahara and purchased 2015 in Erfoud by Hichame Mimaghador

Physical characteristics: The main mass is covered by a black fusion crust. A sawn surface reveals a brecciated texture.

Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi): A thin section shows a monomict breccia composed of basaltic eucrite clasts in a matrix of related debris. Eucritic clasts are characterized by clinopyroxene, minor anorthitic plagioclase and orthopyroxene with fine (2-3 μm) pigeonite exsolution lamellae. Minor phases are ilmenite, troilite and chromite.

Geochemistry: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi); Eucritic clasts: Calcic plagioclase An 88.0±1.2Or0.9±0.1, n=7; low-Ca pyroxene (Fs56.1±1.3En43.6±1.3Wo2.3±0.2; n=7; Fe/Mn=36.5±0.3); augite (Fs39.2±8.5En28.0±2.1Wo32.9±6.5; n=7; Fe/Mn=35.4±0.1); pigeonite exsolution lamellae in orthopyroxene (Fs59.4±1.4En29.9±1.5Wo10.7±1.5; n=8; Fe/Mn = 34.2±0.3). matrix: low-Ca pyroxene (Fs64.1±1.3En32.4±1.4Wo3.5±0.4; n=8; Fe/Mn=34.0±0.3); Oxygen isotopes: (I. Franchi, R. Greenwood, OU) δ17O = 1.82‰, δ18O = 3.89‰, Δ17O = -0.21‰.

Classification: Eucrite, monomict with moderate degree of shock and medium degree of weathering.

Specimens: A total of 8.5 g specimen and one thin section is on deposit at the MSN-FI. Mimaghador owns the main mass.

Data from:
  MB105
  Table 0
  Line 0:
State/Prov/County:Morocco
Place of purchase:Erfoud
Date:P 2015 Sept
Mass (g):41.9
Pieces:1
Class:Eucrite-mmict
Shock stage:moderate
Weathering grade:medium
Ferrosilite (mol%):64.1±1.3 (n=8); 59.4±1.4 (n=7); 39.2±8.5 (n=8)
Wollastonite (mol%):3.5±0.4; 10.7±1.5; 32.9±6.5
Classifier:V. Moggi Cecchi, S. Caporali, G. Pratesi, MSN-FI
Type spec mass (g):8.5
Type spec location:MSN-FI
Main mass:Mimaghador
Comments:Submitted by Vanni Moggi Cecchi
Plots: O isotopes:  
Institutions
   and collections
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
MSN-FI: MUSEO DI STORIA NATURALE DELL'UNIVERSITA' DEGLI STUDI DI FIRENZE Via Giorgio La Pira, 4 – 50121 FIRENZE, Italy; Website (institutional address; updated 14 Jan 2015)
UniFi: Università degli Studi di Firenze, P.zza S. Marco, 4 - 50121 Firenze, Italy (institutional address; updated 14 Sep 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Hichame Mimaghador   
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1386 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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