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Northwest Africa 12228
Basic information Name: Northwest Africa 12228
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12228
Observed fall: No
Year found: 2018
Country: Northwest Africa
Mass:help 44.6 g
Classification
  history:
Recommended:  LL3-6 melt breccia    [explanation]

This is the only approved meteorite classified as LL3-6 melt breccia.
Search for other: LL chondrites, LL chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 27 Mar 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12228 (NWA 12228)

Northwest Africa

Purchased: 2018

Classification: LL3-6 melt breccia

History: Purchased by Fred Olsen in 2018 in Tucson, AZ.

Petrography: (D. Sheikh, FSU) Apart from one relict barred olivine (1054 um), no chondrules are present. Subangular clasts (0.5-7 mm) embedded in a dark matrix of impact melt. Feldspar present (10-100 um). Contains rounded blebs of troilite and angular grains of taenite. Equilibrated and unequilibrated clasts present.

Geochemistry: Equilibrated clasts: Olivine, Fa29.9±0.5 (N=32); Low Calcium Pyroxene, Fs26.9±0.7Wo2.9±0.2 (N=25); High-Ca pyroxene, Fs17.8±0.6Wo31.6±0.9 (N=25); Sodic plagioclase, An12 (N=4). Unequilibrated clasts: Olivine, Fa25.8-38.8; low-Ca pyroxene, Fs23.6-36.5Wo2.3-6.1.

Classification: Ordinary Chondrite (LL3-6 melt breccia)

Specimens: 9.7 grams at UCLA; main mass with Olsen.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Tucson, AZ
Date:P 2018
Mass (g):44.57
Pieces:1
Class:LL3-6 melt breccia
Shock stage:S2
Weathering grade:W1
Classifier:D. Sheikh, FSU
Type spec mass (g):9.7
Type spec location:UCLA
Main mass:Olsen
Comments:Submitted by Daniel 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)
Olsen: Unknown person (private address; updated 17 Apr 2009)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
Daniel Sheikh   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 3 approved meteorites from Northwest Africa (plus 3 unapproved names)

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