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Northwest Africa 13768
Basic information Name: Northwest Africa 13768
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13768
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 1680 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 8 Apr 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13768 (NWA 13768)

(Northwest Africa)

Purchased: 2020

Classification: HED achondrite (Howardite)

History: The meteorite was purchased from a dealer in Errachidia, Morocco.

Physical characteristics: Light grayish fragment partly covered by fusion crust.

Petrography: The meteorite displays a fresh light-grayish interior and is a polymict breccia composed of lithic and mineral clasts set into a fine-grained clastic matrix. Lithic clasts are basaltic, gabbroic, and dark impact melt clast up to 1.7 cm in size. Main minerals are up to 1 mm sized diogenetic orthopyroxene (about 15%), compositionally zoned low-Ca pyroxene, exsolved pyroxene and calcic plagioclase. Minor phases include silica, chromite, ilmenite, FeS, fayalitic olivine, and kamacite.

Geochemistry: diogenetic pyroxene: Fs30.0±0.6Wo5.5±0.5 (Fs29.1-30.7Wo5.1-6.4, FeO/MnO=23-27, n=7); zoned pyroxene: Fs38.7±6.8Wo10.8±4.0 (Fs24.7-46.1Wo4.5-16.0, FeO/MnO=24-26, n=7); eucritic low-Ca pyroxene host crystals to augite lamellae: Fs53.3±1.0Wo5.2±0.9 (Fs52.0-54.8Wo4.0-6.2, FeO/MnO=29-30, n=6); augite exsolution lamellae: Fs26.2±0.2Wo41.1±0.2 (Fs25.8-26.6Wo40.7-41.3, FeO/MnO=24-28, n=6); olivine: Fa76.5±0.1, FeO/MnO=40, n=2); calcic plagioclase: An87.5±5.4 (An75.4-90.3, n=6)

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Errachidia, Morocco
Date:P 2020
Mass (g):1680
Pieces:1
Class:Howardite
Shock stage:low
Weathering grade:low
Fayalite (mol%):76.5
Ferrosilite (mol%):30.0; 38.7; 53.3; 26.2
Wollastonite (mol%):5.5; 10.8; 5.2; 41.1
Classifier:A. Greshake, MNB
Type spec mass (g):27.2
Type spec location:MNB
Main mass:Tomasz Jakubowski
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. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

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

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