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Northwest Africa 4964
Basic information Name: Northwest Africa 4964
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4964
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 456 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  CK3
Recommended:  CK3    [explanation]

This is 1 of 36 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
Writeuphelp
Writeup from MB 105:

Northwest Africa 4964 (NWA 4964)

(Northwest Africa)

Purchased: 2007

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 1.13±0.69 mm (0.47-3.83 mm; n=31). Chondrules with igneous rims occur and CAIs up to 1.3 cm are observed.

Geochemistry: The composition of matrix olivine is Fa33.8±0.6 (Fa32-35; n=16), while olivine in chondrule cores retained its original Mg-rich composition. Random olivine measurements revealed Fa30.7±5.9 (Fa13-35; n=22). Low-Ca pyroxene (En95-98Fs1-4 Wo1; n=5) mainly occurs in chondrules. Most pyroxene grains outside of chondrules are Ca-rich (En36-42Fs7-14 Wo49-51; n=7). The compositional range of feldspar (n=4) is An21-31. Magnetite is the most abundant opaque phase and shows significant concentrations of elements other than Fe (n=3): MgO 0.8-0.9 wt%; Al2O3 3.2-3.6 wt%; TiO2 0.8-0.9 wt%; Cr2O3 2.6-3.7 wt%; NiO 0.3-0.4 wt%.

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

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 2007
Mass (g):456
Pieces:1
Class:CK3
Shock stage:S1
Weathering grade:moderate
Fayalite (mol%):30.7±5.9 (13-35; n=22)
Ferrosilite (mol%):2.6±1.2 (1-4; n=5)
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
Institutions
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Catalogs:
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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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Dirk Hohmann   
Franco Vignato   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6528 approved meteorites from (Northwest Africa) (plus 2021 unapproved names)

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