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Northwest Africa 11997
Basic information Name: Northwest Africa 11997
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11997
Observed fall: No
Year found: 2018
Country: Morocco
Mass:help 30.2 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 439 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 27 Sep 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11997 (NWA 11997)

Morocco

Purchased: July 2018

Classification: HED achondrite (Howardite)

History: Purchased online by D. Sheikh in July 2018.

Physical characteristics: Single 30.2 gram stone covered by black fusion crust with flow lines, cut surface reveals fine-grained, light-gray interior.

Petrography: (D. Sheikh, FSU) Fine-grained polymict breccia, <4 mm clast size for diogenite clasts, <2 mm for cumulate and basaltic eucrite clasts. Modal content of howardite (in vol.%): diogenites, 40%; cumulate eucrites, 25%; basaltic eucrites, 25%; anorthosite clasts, 7%; shock melt zones, 2%; opaques, 1%.

Geochemistry: Eucrite pyroxene: pigeonite (Fs47.5Wo10.99), n=25; augite (Fs35.45Wo30.2), n=5; FeO/MnO=23. Diogenite pyroxene: orthopyroxene (Fs24.4Wo5.08), n=10; FeO/MnO=18. Calcic plagioclase (An87), N=25. Ilmenite (Fe/(Fe+Mg)) =87.83%, N=4. FeS and FeO scattered throughout matrix. SiO2-rich glass present.

Classification: Achondrite (Howardite)

Specimens: 8.98 g at UCLA, 2.67 g with C. Anderkin, main mass with D. Sheikh

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:online
Date:P July 2018
Mass (g):30.2
Pieces:4
Class:Howardite
Shock stage:Moderate
Weathering grade:Low
Classifier:D. Sheikh, FSU; C.Anderkin, UF
Type spec mass (g):8.98
Type spec location:UCLA
Main mass:D. Sheikh
Comments:Submitted by D. Sheikh
Institutions
   and collections		 UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Photos:
CreditPhotos
Public domain photographs:
Daniel Sheikh            
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1973 approved meteorites from Morocco (plus 37 unapproved names) (plus 1 impact crater)

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