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Northwest Africa 13469
Basic information Name: Northwest Africa 13469
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13469
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 27 g
Classification
  history:
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 42 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 11 Nov 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13469 (NWA 13469)

(Northwest Africa)

Purchased: July 2020

Classification: HED achondrite (Eucrite, melt breccia)

History: The meteorite was bought by the main mass holder from an Algerian meteorite dealer.

Physical characteristics: Dark-grayish rock with some fusion crust.

Petrography: The meteorite is a melt-supported eucritic breccia composed of up to 0.4 mm sized basaltic and mineral clasts set into abundant shock melt. Dominant minerals are exsolved pyroxene and calcic plagioclase partly converted into maskelynite. Minor phases include silica, FeS, chromite, ilmenite, and secondary barite. No metallic iron has been detected.

Geochemistry: low-Ca pyroxene: Fs59.8±0.7Wo2.4±0.4 (Fs57.9-60.7Wo2.0-3.7, n=14, FeO/MnO=26-30); Ca-pyroxene: Fs26.0±0.7Wo44.0±0.7 (Fs25.2-28.3Wo42.5-44.9, n=14, FeO/MnO=25-32); calcic plagioclase: An90.4±0.6 (An88.9-91.6, n=15)

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Adra, Algeria
Date:P July 2020
Mass (g):27
Pieces:1
Class:Eucrite-melt breccia
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):59.8; 26.0
Wollastonite (mol%):2.4; 44.0
Classifier:A. Greshake, MNB
Type spec mass (g):5.7
Type spec location:MNB
Main mass:Lucian Cojocaru
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:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7741 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

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