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Northwest Africa 10642
Basic information Name: Northwest Africa 10642
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10642
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 51 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Eucrite-cm
Recommended:  Eucrite-cm    [explanation]

This is 1 of 44 approved meteorites classified as Eucrite-cm.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 15 May 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 10642 (NWA 10642)

Morocco, (Northwest Africa)

Purchased: 2015 Sept

Classification: HED achondrite (Eucrite, cumulate)

History: Four small fragments totaling 51.0 g were found in Western Sahara and purchased 2015 in Erfoud by Hichame Mimaghador.

Physical characteristics: None of the fragments displays fusion crust.

Petrography: (V. Moggi Cecchi, G. Pratesi, and S. Caporali, UniFi): A thin section shows a cumulative medium-grained texture. Orthopyroxene, with crystals 90-150 μm in width, is the dominant phase, with minor clinopyroxene and anorthitic plagioclase. Rare low-Ca pyroxene crystals with fine, 5-7 μm, pigeonitic exsolution lamellae, are visible. Minor phases are ilmenite, troilite and rare chromite.

Geochemistry: (V. Moggi Cecchi, G. Pratesi, and S. Caporali, UniFi) Calcic plagioclase An89.5±1.2Or0.3±0.1, n=7; low-Ca pyroxene in matrix (Fs48.3±1.1En48.9±1.1Wo2.8±0.1; n=6; Fe/Mn=34.5±0.2); augite (Fs22.8±1.1En35.7±1.3Wo41.5±0.2; n=7; Fe/Mn=31.0±0.1); pigeonite exsolution lamellae in orthopyroxene (Fs53.1±1.2En40.3±1.1Wo6.7±0.2; n=7; Fe/Mn = 33.0±0.1).

Classification: Eucrite-cm with moderate degree of shock and medium degree of weathering.

Specimens: A total of 16.5 g and one thin section is on deposit at MSN-FI. Mimaghador owns the main mass.


Writeup from MB 105:

Northwest Africa 10642 (NWA 10642)

Morocco, (Northwest Africa)

Purchased: 2015 Sept

Classification: HED achondrite (Eucrite, cumulate)

History: Four small fragments totaling 51.0 g were found in Western Sahara and purchased 2015 in Erfoud by Hichame Mimaghador.

Physical characteristics: None of the fragments displays fusion crust.

Petrography: (V. Moggi Cecchi, G. Pratesi, and S. Caporali, UniFi): A thin section shows a cumulative medium-grained texture. Orthopyroxene, with crystals 90-150 μm in width, is the dominant phase, with minor clinopyroxene and anorthitic plagioclase. Rare low-Ca pyroxene crystals with fine, 5-7 μm, pigeonitic exsolution lamellae, are visible. Minor phases are ilmenite, troilite and rare chromite.

Geochemistry: (V. Moggi Cecchi, G. Pratesi, and S. Caporali, UniFi) Calcic plagioclase An89.5±1.2Or0.3±0.1, n=7; low-Ca pyroxene in matrix (Fs48.3±1.1En48.9±1.1Wo2.8±0.1; n=6; Fe/Mn=34.5±0.2); augite (Fs22.8±1.1En35.7±1.3Wo41.5±0.2; n=7; Fe/Mn=31.0±0.1); pigeonite exsolution lamellae in orthopyroxene (Fs53.1±1.2En40.3±1.1Wo6.7±0.2; n=7; Fe/Mn = 33.0±0.1).

Classification: Eucrite-cm with moderate degree of shock and medium degree of weathering.

Specimens: A total of 16.5 g and one thin section is on deposit at 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):51.0
Pieces:4
Class:Eucrite-cm
Shock stage:moderate
Weathering grade:medium
Ferrosilite (mol%):48.3±1.1; 53.1±1.2; 22.8±1.1;
Wollastonite (mol%):2.8±0.1; 6.7±0.2; 41.5±0.2;
Classifier:V. Moggi Cecchi, S. Caporali, G. Pratesi, MSN-FI
Type spec mass (g):16.5
Type spec location:MSN-FI
Main mass:Mimaghador
Finder:anonymous
Comments:Submitted by Vanni Moggi Cecchi
Institutions
   and collections
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
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Franco Vignato   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 21 approved meteorites from Morocco, (Northwest Africa)
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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