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Northwest Africa 12905
Basic information Name: Northwest Africa 12905
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12905
Observed fall: No
Year found: 2019
Country: Algeria
Mass:help 1500 g
Classification
  history:
Recommended:  Howardite    [explanation]

This is 1 of 374 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 6 Oct 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12905 (NWA 12905)

Algeria

Purchased: 2019

Classification: HED achondrite (Howardite)

History: Purchased by Matthew Stream in 2019 from a seller in Algeria.

Physical characteristics: Minor fusion crust; a slice of the interior reveals a variety of light and dark clasts set in a fine-grained matrix.

Petrography: (D. Sheikh, FSU) Fine-grained polymict breccia, <7 mm clast size for basaltic eucrite clasts, <3 mm for diogenite clasts, <2 mm for cumulate eucrite clasts. Modal content of howardite (in vol.%): diogenites, 30%; cumulate eucrites, 25%; basaltic eucrites, 40%; anorthosite clasts, 4%; opaques, 1%.

Geochemistry: Eucrite pyroxene: pigeonite (Fs46.6Wo12.2), n=19; augite (Fs36.5Wo31.8), n=4; Fe/Mn=28. Diogenite pyroxene: orthopyroxene (Fs30.1Wo2.7), n=35; Fe/Mn=30. Calcic plagioclase (An90), N=13. Chromite and SiO2-rich glass present.

Classification: Achondrite (Howardite). Likely paired with NWA 12227 due to both originating from the same source in Algeria.

Specimens: 20.08 grams at UCLA; main mass with Matthew Stream.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2019
Mass (g):1500
Pieces:many
Class:Howardite
Shock stage:moderate
Weathering grade:low
Classifier:D. Sheikh, FSU
Type spec mass (g):20.08
Type spec location:UCLA
Main mass:Matthew Stream
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
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Photos:
CreditPhotos
Public domain photographs:
Daniel Sheikh   
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 979 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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