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Northwest Africa 13649
Basic information Name: Northwest Africa 13649
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13649
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 164 g
Classification
  history:
Meteoritical Bulletin:  MB 110  (2022)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 459 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 16 Jan 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13649 (NWA 13649)

(Northwest Africa)

Purchased: 2020 Oct

Classification: HED achondrite (Howardite)

History: The meteorite was purchased from a dealer in Tindouf, Algeria.

Physical characteristics: Dark brownish rock without fusion crust. Exposes fresh dark grayish interior.

Petrography: The meteorite is a polymict fragmental breccia composed of a large varitey of mineral and few up to 2 mm sized coarse-grained basaltic clasts set into a fine-grained clastic groundmass. Predominant minerals are diogenetic low-Ca pyroxene (about 40 vol%), more Fe-rich low-Ca pyroxene, Fe-rich low-Ca pyroxenes with augite exsolution lamellae, magmatically zoned low-Ca pyroxene, and calcic plagioclase all with highly variable grain sizes. Diogenetic low-Ca pyroxenes are up to 1 mm in size. Minor phases include silica, chromite, ilmenite, FeS, and metallic iron. The meteorite is highly shocked and contains shock melt veins; plagioclase is completely converted into maskelynite.

Geochemistry: eucritic low-Ca pyroxene: Fs62.8±1.1Wo2.6±0.4 (Fs60.8-63.9Wo2.2-3.7, n=13, FeO/MnO=28-31); augite exsolution lamellae: Fs27.8±0.6Wo41.6±0.5 (Fs26.7-28.7Wo40.7-42.4, n=13, FeO/MnO=24-31); low-Ca-pyroxene: Fs39.2±0.2Wo2.6±0.1 (Fs39.0-39.5Wo2.4-2.7, n=7, FeO/MnO=25-28); zoned low-Ca-pyroxene: Fs26.2±4.6Wo2.7±0.1 (Fs22.0-34.2Wo2.4-2.9, n=10, FeO/MnO=26-32); diogenetic low-Ca pyroxene: Fs29.9±0.2Wo3.0±0.1 (Fs29.4-30.1Wo2.9-3.1, n=7, FeO/MnO=25-27); calcic plagioclase: An86.6±4.9 (An80.9-92.8, n=12)

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Tindouf, Algeria
Date:P 2020 Oct
Mass (g):164
Pieces:1
Class:Howardite
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):62.8; 27.8; 29.9; 39.2; 26.2
Wollastonite (mol%):2.6; 41.6; 3.0; 2.6; 4.6
Classifier:A. Greshake, MNB
Type spec mass (g):25.4
Type spec location:MNB
Main mass:Salamu Hamad
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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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)
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Revision
  history:
  This lists important revisions made to data for this record.

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