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Northwest Africa 8175
Basic information Name: Northwest Africa 8175
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8175
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 62 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  CK4
Recommended:  CK4    [explanation]

This is 1 of 105 approved meteorites classified as CK4.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 21 May 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8175 (NWA 8175)

Northwest Africa

Purchased: 2013 Dec

Classification: Carbonaceous chondrite (CK4)

History: Purchased by Stefan Ralew in December 2013 from a dealer in Zagora, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Fresh specimen composed of separated, well-formed, granular chondrules containing abundant magnetite in a coarser grained, recrystallized matrix. Minerals are olivine , orthopyroxene, subcalcic augite, augite, anorthite, intermediate plagioclase, Cr-magnetite (some slightly altered) and Cr-Ti-magnetite. One very fine-grained CAI was found to be composed of anorthite, Al-Ti-diopside, intergrown ilmenite+magnetite, pleonaste spinel and minor olivine.

Geochemistry: Olivine (Fa30.3-30.9, FeO/MnO = 118-120), orthopyroxene (Fs23.2-26.3Wo4.9-0.6), subcalcic augite (Fs16.3Wo27.6), augite (Fs10.4Wo49.4). Oxygen isotopes (K. Ziegler, UNM): acid-washed subsamples of a small CAI analyzed by laser fluorination gave, respectively δ17O -5.132, -11.907, -10.141; δ18O -0.983, -8.049, -6.383; Δ17O -4.613, -7.657, -6.771 per mil (for a TFL slope of 0.528).

Classification: Carbonaceous chondrite (CK4).

Specimens: 12.5 g including one polished thin section at UWB. The remaining material is held by Ralew.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2013 Dec
Mass (g):62
Pieces:1
Class:CK4
Shock stage:S2
Weathering grade:low
Fayalite (mol%):30.3-30.9
Ferrosilite (mol%):23.2-26.3
Wollastonite (mol%):4.9-0.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):12.5
Type spec location:UWB
Main mass:S. Ralew
Comments:50.5; submitted by A. Irving
Plots: O isotopes:  
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6984 approved meteorites from (Northwest Africa) (plus 2008 unapproved names)

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