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Northwest Africa 11398
Basic information Name: Northwest Africa 11398
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11398
Observed fall: No
Year found: 2016
Country: Algeria
Mass:help 340 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  CV3
Recommended:  CV3    [explanation]

This is 1 of 536 approved meteorites (plus 1 unapproved name) classified as CV3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Comments: Approved 15 Aug 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 11398 (NWA 11398)

Algeria

Purchased: 2016 Aug

Classification: Carbonaceous chondrite (CV3)

History: Purchased from Abdeltif Mechaguen in Mauritania in August 2016.

Physical characteristics: The 27 g specimen is unfractured, with homogeneous appearance, no fusion crust, having rounded and rough surfaces.

Petrography: Around twenty AOA were observed at each cm2 with size 0.35 -1.6 mm. Several CAIs were also present, together comprising 22% of the sample. Chondrules with roughly the same spatial density as the CAIs are present, average size 0.8 mm (0.3-1.9 mm, 34% of the sample); matrix is about 45%. Main minerals: olivine and pyroxene, with accessories feldspar, melilite, spinel, and perovskite. void-filling alteration products: iron oxides, carbonates (calcite, ankerite, siderite-rhodocrosite), sulfates (barite, mixed coelestine); opaque minerals <3% in the sample: troilite, pentlandite, magnetite. At the S3 shock level the minerals are fractured and mechanical twins are present in pyroxenes, but the olivines do not show mosaicism. 70-90% of troilite and metal in opaque chondrules are oxidized, opaque veins are transformed to iron oxides (W3).

Geochemistry: Fa8.2±6.7 (Fa0-26.1, N=44), Fs7.7±8.1Wo30.9±8.1 (Fs2.6-29.0Wo13.5-41.0, N=13)

Classification: CV3, S2

Specimens: Many specimens, in all 340 g. 27 g at CSFK, remainider with owner Zs. Kereszty, private collection.

Data from:
  MB106
  Table 0
  Line 0:
Origin or pseudonym:Close to Tindouf
Date:P 2016 Aug
Mass (g):340
Pieces:~30
Class:CV3
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):8.2±6.7 (N=44)
Ferrosilite (mol%):7.7±8.1 (N=13)
Wollastonite (mol%):30.9±8.1 (N=13)
Classifier:A. Kereszturi. I. Gyollai, M. Szabo, Zs. Kereszty
Type spec mass (g):27
Type spec location:CSFK
Main mass:Zs. Kereszty
Finder:unknown
Comments:Working name was ZK-9.; submitted by A. Kereszturi, Zs. Kereszty
Institutions
   and collections
CSFK: Research Center for Astronomy and Earth Sciences, H-1121 Budapest, Konkoly Thege Miklós út 15-17.l Hungary, Hungary (institutional address; updated 7 Apr 2015)
Catalogs:
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Zsolt Kereszty   
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1008 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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