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Northwest Africa 13263
Basic information Name: Northwest Africa 13263
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13263
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 118 g
Classification
  history:
Recommended:  Howardite    [explanation]

This is 1 of 399 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 5 Apr 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13263 (NWA 13263)

(Northwest Africa)

Purchased: 2019

Classification: HED achondrite (Howardite)

History: The meteorite was purchased from a meteorite dealer in Layoune, Western Sahara.

Physical characteristics: Brownish rock partly covered with fusion crust.

Petrography: The meteorite is a polymict breccia with fine- and coarse-grained basaltic clasts, black impact melt clasts, and up to 4 mm sized diogenitic low-Ca pyroxene set into a clastic matrix predominantly composed of exsolved pyroxene, compositionally zoned low-Ca pyroxene, and calcic plagioclase of variable grain sizes. Contains about 15-20% diogenetic components. Minor phases include silica, chromite, FeS, and ilmenite. No metallic iron has been detected. One chondrule-like object composed of barred olivine and pyroxene crystals has been found. The meteorite is highly shocked, i.e., plagioclase is partly transformed to maskelynite and shock melt veins and pockets are present.

Geochemistry: diogenetic pyroxene: Fs22.7±0.2Wo2.0±0.1 (Fs22.3-22.9Wo1.9-2.0, FeO/MnO=25-30, n=11); zoned low-Ca pyroxene: Fs27.7±3.4Wo2.7±1.0 (Fs24.2-32.5Wo2.2-5.7, FeO/MnO=25-29, n=10); low-Ca pyroxene host to augite exsolution lamellae: Fs64.0±1.2Wo7.0±1.0 (Fs61.9-65.3Wo5.9-8.6, FeO/MnO=25-27, n=10); Ca-pyroxene exsolution lamellae: Fs36.0±1.4Wo39.1±1.3 (Fs35.1-40.2Wo35.5-40.2, FeO/MnO=25-29, n=11); calcic plagioclase: An86.4±4.3 (An81.5-92.3, n=12)

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Layoune, West Sahara
Date:P 2019
Mass (g):118
Pieces:1
Class:Howardite
Shock stage:strong
Weathering grade:low
Ferrosilite (mol%):22.7; 27.7; 64.0; 36.0
Wollastonite (mol%):2.0; 2.7; 7.0; 39.1
Classifier:A. Greshake, MNB
Type spec mass (g):22.3
Type spec location:MNB
Main mass:Hanno Strufe
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake         
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7885 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

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