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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:
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 Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Weibiao Hsu         
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1166 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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