Meteoritical Bulletin: Entry for Northwest Africa 10642

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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: 51 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	Eucrite-cm
Recommended:			Eucrite-cm [explanation]

This is 1 of 54 approved meteorites classified as Eucrite-cm. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 15 May 2016

Writeup

help

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 An_89.5±1.2Or_0.3±0.1, n=7; low-Ca pyroxene in matrix (Fs_48.3±1.1En_48.9±1.1Wo_2.8±0.1; n=6; Fe/Mn=34.5±0.2); augite (Fs_22.8±1.1En_35.7±1.3Wo_41.5±0.2; n=7; Fe/Mn=31.0±0.1); pigeonite exsolution lamellae in orthopyroxene (Fs_53.1±1.2En_40.3±1.1Wo_6.7±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 An_89.5±1.2Or_0.3±0.1, n=7; low-Ca pyroxene in matrix (Fs_48.3±1.1En_48.9±1.1Wo_2.8±0.1; n=6; Fe/Mn=34.5±0.2); augite (Fs_22.8±1.1En_35.7±1.3Wo_41.5±0.2; n=7; Fe/Mn=31.0±0.1); pigeonite exsolution lamellae in orthopyroxene (Fs_53.1±1.2En_40.3±1.1Wo_6.7±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 “La Specola”, Sez. Mineralogia – Sistema Museale dell'Università degli Studi di Firenze Via Giorgio La Pira, 4 – 50121 Firenze, Italy; Website (institutional address; updated 24 Oct 2022)
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:

Credit	Photos
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 25 approved meteorites from Morocco, (Northwest Africa)
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
history:

This lists important revisions made to data for this record.

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