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Northwest Africa 13687
Basic information Name: Northwest Africa 13687
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13687
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 700 g
Classification
  history:
Recommended:  Diogenite    [explanation]

This is 1 of 481 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 6 Feb 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13687 (NWA 13687)

(Northwest Africa)

Purchased: 2021 Jan

Classification: HED achondrite (Diogenite)

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

Physical characteristics: Many brownish fragments without fusion crust.

Petrography: The meteorite is a monomict achondritic breccia predominantly composed of up to 3 mm sized orthopyroxene crystals set into fine-grained clastic matrix. Orthopyroxenes contain Ca-pyroxene inclusions with very fine exsolution lamellae. Myrmekitic silica-chromite intergrowth are present at the opx-cpx grain boundaries. Minor phases are silica, chromite, FeS, and metallic Fe. No feldspar has been detected in the thin section studied. The meteorite contains calcite-filled cracks.

Geochemistry: low-Ca pyroxene: Fs30.1±0.3Wo4.1±0.3 (Fs29.7-30.8Wo3.2-4.3, FeO/MnO=25-28, n=7); Ca-pyroxene: Fs13.9±0.2Wo42.0±0.9 (Fs13.5-14.3Wo40.2-43.1, FeO/MnO=18-20, n=7)

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Temara, Morocco
Date:P 2021 Jan
Mass (g):700
Pieces:many
Class:Diogenite
Shock stage:low
Weathering grade:moderate
Ferrosilite (mol%):30.1; 13.9
Wollastonite (mol%):4.1; 42.0
Magnetic suscept.:3.05
Classifier:A. Greshake, MNB
Type spec mass (g):23.2
Type spec location:MNB
Main mass:Said Yousfi
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 8025 approved meteorites from (Northwest Africa) (plus 1951 unapproved names)

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