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Northwest Africa 13143
Basic information Name: Northwest Africa 13143
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13143
Observed fall: No
Year found: 2018
Country: Morocco
Mass:help 307 g
Classification
  history:
Recommended:  Howardite    [explanation]

This is 1 of 379 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 17 Feb 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13143 (NWA 13143)

Morocco

Find: 2018

Classification: HED achondrite (Howardite)

Physical characteristics: Crusted stone. Cut surface reveals a light-gray interior with subrounded whitish clasts with size up to 1 cm, and more angular chondritic black clasts up to 1 cm.

Petrography: (J. Gattacceca, CEREGE) Mineral clasts (to 500 μm) set in a clastic matrix. Main minerals are plagioclase and pyroxene (some exsolved). Pyroxene of diogenitic and eucritic composition are found approximately in equal proportions. Other minerals: ilmenite, chromite (to 200 μm), silica polymorph (to 200 μm), troilite, metal. Contains a 5 mm × 5 mm chondritic clast with small chondrules set in an abundant, fine-grained, iron-rich, phyllosilicate-rich matrix containg sulfide and magnetite.

Geochemistry: Diogenitic low-Ca pyroxene Fs29.4±2.13Wo2.7±1.0 (n=4). Eucritic low-Ca pyroxene Fs54.6±7.0Wo2.0±0.3 (n=3). Ca-pyroxene Fs30.2±5.8Wo28.0±9.4 (n=3). Overall pyroxene FeO/MnO=31.5±2.4. Two Mg-rich pyroxene were analyzed with Fs13.8Wo1.0 and Fs14.2Wo1.0, FeO/MnO=25.8. Plagioclase An92.3±1.3Ab7.4±1.3Or0.3±0.1 (n=5). Chondritic clast: Olivine Fa21.7±12.2 (range Fa2.1-32.2), Cr2O3 0.45±0.03 wt% (n=4), low-Ca pyroxene Fs1.6±0.4Wo1.1±0.2 (n=3). Analyses of a 50 μm × 50 μm matrix area in the chondritic clast gives an analytical total of 80.3 wt%, and FeO 28.6 wt%.

Classification: Achondrite (howardite). Contains a cm-sized CM2-like clast.

Specimens: Type specimen at CEREGE. Main mass with George Penneff

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:internet
Date:2018
Mass (g):307
Pieces:3
Class:Howardite
Magnetic suscept.:3.52
Classifier:J. Gattacceca, CEREGE
Type spec mass (g):23
Type spec location:CEREGE
Main mass:George Penneff
Comments:work name GP07; submitted by Jérôme Gattacceca
Institutions
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
Jerome Gattacceca   
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1481 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

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