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Northwest Africa 12227
Basic information Name: Northwest Africa 12227
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12227
Observed fall: No
Year found: 2018
Country: Algeria
Mass:help 280 g
Classification
  history:
Recommended:  Howardite    [explanation]

This is 1 of 372 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 11 Dec 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 12227 (NWA 12227)

Algeria

Find: April 2018

Classification: HED achondrite (Howardite)

Petrography: (D. Sheikh, FSU) Fine-grained polymict breccia, <7 mm clast size for basaltic eucrite clasts, <3 mm for diogenite clasts, < 2mm for cumulate eucrite clasts. Modal content (in vol.%): diogenites, 46%; cumulate eucrites, 12%; basaltic eucrites, 35%; anorthosite clasts, 5%; shock melt zones, 1%; opaques, 1%.

Geochemistry: Eucrite pyroxene: pigeonite (Fs44.95Wo18.29), n=25; augite (Fs39.9Wo34.4), n=6; FeO/MnO=28. Diogenite pyroxene: orthopyroxene (Fs27.4Wo6.84), n=10; FeO/MnO=22. Calcic plagioclase (An89), N=25. Ilmenite (Fe/(Fe+Mg)) = 88.42%, N=2. FeS and SiO2-rich glass present.

Classification: Achondrite (howardite)

Specimens: 25.65 grams at UCLA, main mass with Matthew Stream.

Data from:
  MB107
  Table 0
  Line 0:
Date:April 2018
Mass (g):280
Pieces:1
Class:Howardite
Shock stage:Moderate
Weathering grade:Low
Classifier:D. Sheikh, FSU
Type spec mass (g):25.65
Type spec location:UCLA
Main mass:Matthew Stream
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, in preparation (2018)
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Filip Stalmach   
Public domain photographs:
Daniel Sheikh      
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 970 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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