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Northwest Africa 13644
Basic information Name: Northwest Africa 13644
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13644
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 165 g
Classification
  history:
Recommended:  L-melt rock    [explanation]

This is 1 of 46 approved meteorites classified as L-melt rock.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 21 Feb 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13644 (NWA 13644)

(Northwest Africa)

Purchased: 2020

Classification: Ordinary chondrite (L, melt rock)

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

Physical characteristics: Brownish rock without fusion crust.

Petrography: The rock shows a fine-grained (100-200 µm typical grain size), equigranular texture of euhedral to subhedral olivine and orthopyroxene grains, the latter partly poikilitically enclosing olivine. Some low-Ca pyroxenes are overgrown by thin augite margins. The interstitial space between the crystals is filled with finely crystallized Si,Al-rich minerals. Opaque phases include chromite, sulfides, and FeNi metal, partly present as blebs in mesostasis. Olivine and low-Ca-pyroxene show minor compositional zoning. Neither feldspar nor relict chondrules have been found in the two sections studied. The meteorite contains shock melt veins and pockets.

Geochemistry: Interstitial finely-crystallized material (all wt%; N=4): SiO2: 68.5, TiO2: 0.23, Na2O: 4.40, K2O: 0.67; Cr2O3: 0.03, MgO: 0.30, MnO: 0.02; CaO= 2.24; FeO: 0.92, Al2O3: 21.2, Total: 98.5

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020
Mass (g):165
Pieces:1
Class:L-melt rock
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):25.4±0.9 (23.9-26.3, n=7)
Ferrosilite (mol%):18.1±0.6 (17.2-19.0, n=15)
Wollastonite (mol%):2.2±0.4 (1.6-2.8, n=15)
Classifier:A. Greshake, MNB
Type spec mass (g):22.5
Type spec location:MNB
Main mass:Philippe Schmitt-Kopplin
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
Public domain photographs:
Ansgar Greshake            
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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