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Northwest Africa 13345
Basic information Name: Northwest Africa 13345
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13345
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 1245 g
Classification
  history:
Recommended:  Howardite    [explanation]

This is 1 of 382 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 3 Jul 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13345 (NWA 13345)

(Northwest Africa)

Purchased: 2020

Classification: HED achondrite (Howardite)

History: The meteorite was purchased from a meteorite dealer in Mauritania.

Physical characteristics: Individual almost completely covered by shiny fusion crust.

Petrography: The meteorite is a polymict breccia composed of a large diversity of mostly angular mineral fragments and basaltic clasts set into a fine-grained clastic mineral matrix. Dominant minerals are diogenetic low-Ca pyroxene (about 60 vol%), Fe-rich low-Ca pyroxenes with augite exsolution lamellae, Fe-rich low-Ca pyroxene, magmatically zoned low-Ca pyroxenes, and calcic plagioclase all with highly variable grain sizes. Minor phases include silica, chromite, ilmenite, and metallic iron. The meteorite contains cm-sized coarse-grained basaltic clasts.

Geochemistry: eucritic low-Ca pyroxene: Fs58.3±0.2Wo5.4±0.1 (Fs58.0-58.7Wo5.3-5.5, n=10, FeO/MnO=28-31); augite exsolution lamellae: Fs27.3±0.2Wo43.3±0.2 (Fs26.9-27.6Wo43.1-43.6, n=10, FeO/MnO=30-33); diogenetic low-Ca pyroxene: Fs27.4±0.6Wo3.3±0.7 (Fs26.9-28.6Wo2.3-3.8, n=10, FeO/MnO=24-34); low-Ca-pyroxene: Fs40.1±0.3Wo2.6±0.1 (Fs39.5-40.4Wo2.5-2.7, n=7, FeO/MnO=26-28); zoned low-Ca-pyroxene: Fs39.9±8.0Wo5.2±0.3 (Fs31.4-49.7Wo4.9-5.7, n=6, FeO/MnO=25-31); calcic plagioclase: An93.4±0.7 (An92.7-94.5, n=10)

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2020
Mass (g):1245
Pieces:1
Class:Howardite
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):58.3; 27.3; 27.4; 40.1; 39.9
Wollastonite (mol%):5.4; 43.3; 3.3; 2.6; 5.2
Classifier:A. Greshake, MNB
Type spec mass (g):27.6
Type spec location:MNB
Main mass:R. Lenssen
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:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7354 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

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