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Northwest Africa 4836
Basic information Name: Northwest Africa 4836
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4836
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 166 g
Classification
  history:
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 406 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 26 Feb 2024
Writeuphelp
Writeup from MB 113:

Northwest Africa 4836 (NWA 4836)

(Northwest Africa)

Purchased: 2006

Classification: HED achondrite (Eucrite, polymict)

History: Purchased by Marcin Cimala in 2006 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Breccia composed predominantly of angular mineral grains and some lithic clasts derived from eucritic lithologies plus <10 vol.% of diogenitic orthopyroxene grains set within a fine grained matrix. Minerals are exsolved pigeonite, augite, unexsolved pigeonite, calcic plagioclase, anorthite, silica polymorph, chromite, ilmenite, troilite, Fe-metal and merrillite. Lithic eucrite clasts have intergranular textures and exhibit a range in grainsize.

Geochemistry: Diogenitic orthopyroxene (Fs24.9-25.8Wo1.7-2.0, FeO/MnO = 30-32, N = 3), low-Ca pyroxene hosts (Fs42.4-48.1Wo2.4-5.4, FeO/MnO = 28-32, N = 9), pigeonite hosts (Fs58.7-60.5Wo5.7-6.6, FeO/MnO = 31-34, N = 5), pigeonite (Fs32.1-43.1Wo5.6-9.2, FeO/MnO = 28-33, N = 9; Fs49.4-53.4Wo16.6-13.1, FeO/MnO = 31-33, N = 3), augite (Fs21.0-21.9Wo43.2-42.0, FeO/MnO = 28-30, N = 2; Fs32.3Wo39.9, FeO/MnO = 33), calcic plagioclase (An75.5-90.2Or1.4-0.2, N = 3), anorthite (An94.3Or0.2).

Classification: Eucrite (polymict breccia).

Specimens: 20.0 g including one polished thin section at BrownU; remainder with Mr. M. Cimala.

Data from:
  MB113
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2006
Mass (g):166
Pieces:1
Class:Eucrite-pmict
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):24.9-25.8; 42.4-48.1; 58.7-60.5; 32.1-43.1
Wollastonite (mol%):1.7-2.0; 2.4-5.4; 5.7-6.6; 5.6-9.2; 16.6-13.1
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):20.0
Type spec location:BrownU
Main mass:M. Cimala
Comments:Work names MC028 and TB1085, thin section MC028; 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)
BrownU: Joseph Boesenberg Brown University Dept of Earth, Environmental and Planetary Sciences (DEEPS) 324 Brook Street Providence, RI 02912 , United States (institutional address; updated 4 Jan 2024)
Catalogs:
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Polandmet         
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)
Also see:
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Revision
  history:
  This lists important revisions made to data for this record.

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