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Northwest Africa 11607
Basic information Name: Northwest Africa 11607
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11607
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 450 g
Classification
  history:
Recommended:  CK3-6    [explanation]

This is 1 of 2 approved meteorites classified as CK3-6.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CK chondrites, CK3 chondrites, and CV-CK clan chondrites
Comments: Approved 9 Feb 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11607 (NWA 11607)

Northwest Africa

Purchased: 2017

Classification: Carbonaceous chondrite (CK3-6)

History: The meteorite was bought from a meteorite dealer in Morocco.

Physical characteristics: Dark grayish to black individual partly covered with fusion crust.

Petrography: The meteorite is a chondritic breccia composed of angular to subrounded type 3-6 clasts set into a more fine-grained clastic matrix. The different clasts are up to 2 cm in size and vary in color from light greenish to almost black. Matrix dominates over chondrules which are on average about 1.2 mm in diameter. Ferroan, Ni-rich olivine is the most abundant mineral in all lithologies. While highly unequilibrated in type 3 clasts and matrix it is equilibrated at Fa29.6 in type 5 and 6 lithologies. One type 6 fragment with more Fe-rich olivine (Fa35) has been encountered. Less abundant are Ca-pyroxene, low-Ca pyroxene, and intermediate feldspar. Feldspar is up to 200 µm in size in type 6 lithologies and often intergrown with Ca-pyroxene. The meteorite containes abundant Cr-bearing magnetite and some FeNi-sulfides.

Geochemistry: Type 3 lithology: olivine: Fa22.4±12.7 (Fa1.7-34.0, NiO=0.3±0.2; FeO/MnO=103±31, n=32); low-Ca pyroxene: Fs16.3±8.0Wo0.9±0.9 (Fs2.9-27.7Wo0.5-4.1, n = 15), Ca-pyroxene: Fs10.9±4.8Wo33.8±6.5 (Fs2.4-17.6Wo23.1-45.1, n = 9); type 6 lithology: olivine: Fa29.6±0.6, NiO=0.4±0.1, FeO/MnO= 105±9, n=42; low-Ca pyroxene: Fs26.9±0.8Wo1.1±0.4, n=9, Ca-pyroxene: Fs11.6±2.6Wo39.3±6.6, n=13; Fe-rich fragment: olivine: Fa35.0±0.3, NiO=0.4±0.1, FeO/MnO= 143±13, n=38; Ca-pyroxene: Fs12.6±1.3Wo46.5±1.6, n=29; plagioclase: An78.8Ab20.9Or0.3, n=3; andesitic feldpar: An35.0Ab64.3Or0.7, n=3; Cr2O3 in magnetite is about 4.9 wt%.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2017
Mass (g):450
Pieces:1
Class:CK3-6
Shock stage:S1
Weathering grade:low
Fayalite (mol%):22.4; 29.6
Ferrosilite (mol%):16.3; 26.9
Wollastonite (mol%):0.9; 1.1
Classifier:A. Greshake, MNB
Type spec mass (g):25.2
Type spec location:MNB
Main mass:Martin Goff
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstrasse 43, D-10115 Berlin, Germany (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake         
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6275 approved meteorites from (Northwest Africa) (plus 2026 unapproved names)

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