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Northwest Africa 8190
Basic information Name: Northwest Africa 8190
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8190
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 660 g
Meteoritical Bulletin:  MB 103  (2014)  CK3
Recommended:  CK3    [explanation]

This is 1 of 75 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 24 Feb 2014
Writeup from MB 103:

Northwest Africa 8190 (NWA 8190)

(Northwest Africa)

Purchased: 2007

Classification: Carbonaceous chondrite (CK3)

Physical characteristics: Many pieces with a light brown weathered surface. This zone of severe weathering forms an up to 2 mm thick shell around each sample. Fractured surfaces are dark brown with blurred chondrules up to 3 mm in size. CAIs with sizes up to 8 mm have been observed. Very compact interior without any visible porosity.

Petrography: (K. Metzler, IfP) The investigated sample consists of two distinct lithologies with sharp contact. The groundmass of both lithologies shows a fine-grained recrystallized texture, consisting of olivine grains and fewer pyroxene and plagioclase grains with sizes on the order of 50-100 μm. Magnetite and weathered sulfides are concentrated in the interstices and around larger objects like chondrules. Lithology 1 contains only sparse chondrules while lithology 2 contains subequal amounts of matrix and chondrules+CAIs. Many chondrules show rims of weathered opaque phases. Several large chondrules show relict Mg-rich olivine (Fa0.5-1) in the center and Fe-rich olivine at the margin.

Geochemistry: (K. Metzler, IfP) The mean composition of olivine (except chondrule cores) is Fa32.8 (Fa28-38). Olivine grains contain about 0.5 wt% NiO (0.2-07 wt%). Olivine in chondrule cores is Ni-free and retained its original Mg-rich composition (Fa0.5-1). Low-Ca pyroxene is less abundant, with a range of compositions (Fs2-27). It is rich in Al with a mean concentration of about 4 wt% Al2O3. Ca-rich pyroxene also occurs. The compositional range of feldspar is An25.5-43.5. Magnetite is the most abundant opaque phase, with significant concentrations of elements other than Fe (n=2): MgO 1-1.5 wt%; Al2O3 3-3.5 wt%; TiO2 1 wt%; Cr2O3 3.5 wt%; NiO 0.5 wt%. The magnetite composition is characteristic for CK chondrites.

Classification: CK chondrite based on mineral chemistry. Petrologic type (3.9) based on olivine variability (PMD=6)

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2007
Mass (g):660
Shock stage:S2
Weathering grade:high
Fayalite (mol%):32.8±2.0 (28-38; n=31)
Ferrosilite (mol%):22.2±5.9 (2-27; n=20)
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:A.+M. Hmani
Comments:Submitted by K. Metzler
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Hmani: A. Hmani Moroccan Imports, 13 rue Jules Hardouin Mansart, 92600 Asnières, France (private address)
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Wojciech Moscinski   

     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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