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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
Recommended:  L-melt rock    [explanation]

This is 1 of 43 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
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:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020
Mass (g):165
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
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Public domain photographs:
Ansgar Greshake            

     This is 1 of 8025 approved meteorites from (Northwest Africa) (plus 1951 unapproved names)

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