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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 518 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 Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Said Yousfi   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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