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Northwest Africa 13943
Basic information Name: Northwest Africa 13943
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13943
Observed fall: No
Year found: 2021
Country: Algeria
Mass:help 93.6 g
Classification
  history:
Meteoritical Bulletin:  MB 110  (2022)  CK4/5
Recommended:  CK4/5    [explanation]

This is 1 of 15 approved meteorites classified as CK4/5.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 24 Dec 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13943 (NWA 13943)

Algeria

Find: 2020

Classification: Carbonaceous chondrite (CK4/5)

History: Purchased by Bo Zhang in April 2021 from an anonymous dealer in NWA.

Physical characteristics: A single cone-shaped stone with a complete fusion crust and visible contraction cracks.

Petrography: Petrographic examination of a thick section shows this meteorite is composed of about 78 vol.% of olivine, 9 vol.% of pyroxene, 3 vol.% of plagioclase, and abundant Cr-bearing magnetite ( 9 vol.%) with minor Ca,Mg carbonates which mainly occur along the cracks. Most olivine grains are free of NiO, but a few with NiO up to 0.22 wt.%. Relatively well-formed chondrules are mainly PO and POP with a size range of 0.21-1.45 mm. Matrix consists of fine-grained olivine, pyroxene, plagioclase, magnetite and minor Ca,Mg carbonates. Both albitic (Ab74±10.7, n=22) and calcic feldspar (An82.6±12.8, n=10) are present. The size of plagioclase ranges from a few µm to 45 µm with a peak at 16.9±6.7 µm (n=206). Metallic Fe-Ni are essentially absent and sulfides are rare.

Geochemistry: Both Na-rich plagioclase (An23.5±11.1Ab74±10.7,n=22 ) and Ca-rich plagioclase(An82.6±12.8Ab17.4±12.8?n=10) are present, olivine (Fa30.3±1.6, FeO/MnO=77-110, n=59), low-Ca pyroxene (Fs27±6.3Wo1.9±3.8, FeO/MnO=52-76, n=79), Ca-rich pyroxene (Fs16.4±4.5Wo29.9±1.8, FeO/MnO=37.4, n=3), Cr-bearing magnetite (Cr2O3 2.4-3.2wt%)).

Classification: The texture and mineral composition are consistent with CK4/5 chondrites.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Shanghai
Date:2020
Mass (g):93.6
Pieces:1
Class:CK4/5
Fayalite (mol%):30.3±1.6 (n=59)
Ferrosilite (mol%):27±6.3 (n=79)
Wollastonite (mol%):1.9±3.8
Classifier:Li Y.
Type spec mass (g):19
Type spec location:PMO
Main mass:Bo Zhang
Comments:Submitted by Hsu W.
Institutions
   and collections
PMO: Purple Mountain Observatory, Nanjing, China (institutional address; updated 16 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
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
Weibiao Hsu         
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1364 approved meteorites from Algeria (plus 31 unapproved names) (plus 4 impact craters)

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