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Northwest Africa 8675
Basic information Name: Northwest Africa 8675
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8675
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 146 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 272 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 12 Dec 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8675 (NWA 8675)

(Northwest Africa)

Purchased: 2014 May

Classification: HED achondrite (Eucrite, monomict)

History: Purchased by John Higgins in May 2014 from a dealer in Laayoune, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Fresh monomict breccia composed of clasts of diabasic eucrite and related crystalline debris. Pyroxene has a clove-brown color in thin section, and shows unusual compositional zoning, with distinct cores of more magnesian low-Ca pyroxene mantled concentrically by much more ferroan low-Ca pyroxene. Grain boundary regions around pyroxene grains contain fayalitic olivine. Other minerals are subcalcic augite, calcic plagioclase, silica polymorph, Al-bearing chromite, ilmenite, troilite, Ni-free metal and rare, tiny grains of zircon.

Geochemistry: Low-Ca pyroxene (cores Fs34.2-35.4Wo8.6-9.1, FeO/MnO = 30, N = 2; rims Fs62.5-66.3Wo7.0-3.4, FeO/MnO = 31-32, N = 2), fayalite (Fa84.6-85.2; FeO/MnO = 42, N = 2), subcalcic augite (Fs8.9-10.6Wo45.3-42.6; FeO/MnO = 30-33, N = 2).

Classification: Eucrite (monomict, diabasic).

Specimens: 23.2 g including one polished thin section at UWB. The remaining material is held by Mr. J. Higgins.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Laayoune
Date:P 2014 May
Mass (g):146
Pieces:1
Class:Eucrite-mmict
Shock stage:low
Weathering grade:low
Fayalite (mol%):84.6-85.2
Ferrosilite (mol%):34.2-66.3; 8.9-10.6
Wollastonite (mol%):9.1-3.4; 45.3-42.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):23.2
Type spec location:UWB
Main mass:J. Higgins
Comments:JH14-13; submitted by A. Irving
Institutions
   and collections		 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)
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 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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