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Northwest Africa 13783
Basic information Name: Northwest Africa 13783
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13783
Observed fall: No
Year found: 2018
Country: Morocco
Mass:help 855 g
Recommended:  H5    [explanation]

This is 1 of 10909 approved meteorites (plus 20 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 13 Mar 2021
Writeup from MB 110:

Northwest Africa 13783 (NWA 13783)


Purchased: 2018 Apr

Classification: Ordinary chondrite (H5)

History: Purchased in Morocco by Sergey Vasiliev and Marc Jost in April 2018.

Physical characteristics: A stone weighing 855 g. The crust is predominantly red-brown and in some places brown. The interior of the meteorite is dark brown with elongated metal blebs.

Petrography: (Pavel Yu. Plechov, FMMR) Petrographic observation of a polished section shows that the meteorite consists of fine-grain matrix and chondrules with sizes vary from 250 µm up to 1.5 mm with predominant sizes 500-750 µm. Plagioclase in matrix have size up to 30 µm. These features indicate a petrological type of 5 for the meteorite. Metal blebs and troilite are fresh and located predominatly in matrix. These blebs are surrounding by hydroxides (weathering grade is W1). Olivine has no undulatory extinction, indicating a shock stage of S1. No shock veins or melt pockets were observed.

Geochemistry: Mineral composition and Geochemistry: EDS analyses (Pavel Yu. Plechov, FMMR). The primary chondrite paragenesis includes olivine 17.51±0.22 (N=5), Low-Ca pyroxene Fs14.2±0.4Wo1.55±0.19 (N=4), plagioclase Ab83.8An9.4Or6.4 (N=2). Composition of kamacite (in wt.,%) Fe 83.24, Ni 16.03, Co 0.72. Taenite contain 34.68 and 0.34 wt.% of Ni and Co respectively. Measured H2O is about 2.5±0.6 and C is 0.45 wt.% (by CNH elemental analyzer).

Classification: (Pavel Yu. Plechov, FMMR). Ordinary chondrite. H5, S1, W1.

Specimens: 29.0 g and thin section, FMMR.

Data from:
  Table 0
  Line 0:
Date:P 2018 Apr
Mass (g):855
Shock stage:S1
Weathering grade:W1
Fayalite (mol%):17.51±0.22 (N=5)
Ferrosilite (mol%):14.2±0.4 (N=4)
Wollastonite (mol%):1.55±0.19
Classifier:Pavel Yu. Plechov, FMMR
Type spec mass (g):29.0
Type spec location:FMMR
Main mass:Sergey Vasiliev
Comments:internal number is FN372 and authors number SM-1804-23; submitted by Pavel Yu. Plechov, pplechov@gmail.com
   and collections
FMMR: Fersman Mineralogical Museum, Leninskiy prospekt 18 korpus 2, Moscow, Russia, 119071, Russia; Website (institutional address; updated 24 Feb 2018)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 1887 approved meteorites from Morocco (plus 26 unapproved names) (plus 1 impact crater)

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