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Northwest Africa 11440
Basic information Name: Northwest Africa 11440
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11440
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 1113 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  L4
Recommended:  L4    [explanation]

This is 1 of 1708 approved meteorites (plus 24 unapproved names) classified as L4.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 15 Sep 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 11440 (NWA 11440)

(Northwest Africa)

Purchased: 2007 June

Classification: Ordinary chondrite (L4)

History: Purchased from a Moroccan dealer at the meteorite fair in Ensisheim, France

Physical characteristics: Single rounded stone of brown color without fusion crust.

Petrography: Mean apparent chondrule size 0510±270 μm (N=208, to 2 mm). Some olivine grains with relict Mg-rich cores are present.

Geochemistry: Mineral compositions and geochemistry: (K. Metzler, IfP) The mean olivine composition is Fa21.4±0.5 (Fa20.6-22.8); n=14. The mean low-Ca pyroxene composition is Fs13.3±5.8Wo0.5±0.2 (Fs3.7-21.7Wo0.2-0.9), n=13

Classification: L4. Although olivine composition is intermediate between H and L, chondrule size favors L. Petrologic type 4 based on the equilibrated state of olivine and unequilibrated state of pyroxene.

Data from:
  MB106
  Table 0
  Line 0:
Date:P 2007 June
Mass (g):1113
Pieces:1
Class:L4
Shock stage:S4
Weathering grade:W1-2
Fayalite (mol%):21.4
Ferrosilite (mol%):13.3
Wollastonite (mol%):0.5
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:Anonymous
Comments:Submitted by K. Metzler, IfP
Institutions
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Catalogs:
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7912 approved meteorites from (Northwest Africa) (plus 1974 unapproved names)

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