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Northwest Africa 6254
Basic information Name: Northwest Africa 6254
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6254
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass:help 1230 g
Meteoritical Bulletin:  MB 105  (2016)  CK3
Recommended:  CK3    [explanation]

This is 1 of 88 approved meteorites classified as CK3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CK chondrites, CK3 chondrites, and CV-CK clan chondrites
Comments: Approved 31 May 2016
Writeup from MB 105:

Northwest Africa 6254 (NWA 6254)

(Northwest Africa)

Purchased: 2009

Classification: Carbonaceous chondrite (CK3)

Petrography: (K. Metzler, IfP) Chondrules and CAIs are embedded into a fine-grained brownish matrix. The matrix consists mostly of equilibrated Fe-rich olivine grains, interspersed with magnetite nodules. The mean apparent chondrule diameter is 1.08±0.44 mm (0.46-2.23 mm; n=54). CAIs up to 0.9 cm are observed. A ~4 cm long vein (confined by the sample size), filled by dark fine-grained material, transects the sample slice.

Geochemistry: The composition of matrix olivine is Fa33.9±0.8 (Fa32-35; n=17), while olivine in chondrule cores retained its original Mg-rich composition. Random olivine measurements revealed Fa30.7±8.3 (Fa0-35; n=21). Low-Ca pyroxene (En89-97 Fs2-10 Wo1-4; n=4) mainly occurs in chondrules. Most pyroxene grains outside of chondrules are Ca-rich (En35-38Fs10-14Wo49-52; n=5). The compositional range of feldspar (n=4) is An15-24. Magnetite is the most abundant opaque phase and shows significant concentrations of elements other than Fe (n=3): MgO 0.5-0.7 wt%; Al2O3 2.8-3.3 wt%; TiO2 0.9-1.1 wt%; Cr2O3 4.1-4.5 wt%; NiO 0.2-0.5 wt%.

Classification: CK chondrite based on mineral chemistry. Petrologic type 3 based on the chemical variation of olivine and pyroxene.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2009
Mass (g):1230
Shock stage:S1
Weathering grade:moderate
Fayalite (mol%):30.7±8.3 (0-35; n=21)
Ferrosilite (mol%):4.4±3.8 (2-10; n=4)
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:M. Cimala, Poland
Comments:Submitted by Ted Bunch, K. Metzler
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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