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Northwest Africa 12884
Basic information Name: Northwest Africa 12884
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12884
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 2.85 kg
Classification
  history:
Recommended:  Eucrite-br    [explanation]

This is 1 of 165 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 6 Oct 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12884 (NWA 12884)

(Northwest Africa)

Purchased: 2015

Classification: HED achondrite (Eucrite, brecciated)

History: Marc Jost (SJS) purchased the 2850 g sample in Rissani in January of 2015.

Physical characteristics: The sample has an irregular shape and the exterior is light brown-tan in color. Clasts are visible on the exterior surface. The cut face shows the interior is a breccia composed of rounded to angular clasts with basaltic textures.

Petrography: Sample is a cataclastic breccia composed of cm-sized, rounded, basaltic and rare cumulate-textured clasts set within a host of related mineral fragments. Clast show ophitic texture. Pyroxenes show exsolution textures and clouding. Additional minerals are: chromite, troilite, ilmenite, an Si polymorph and Ca phosphate minerals.

Geochemistry: (A. Love, App) Low Ca pyroxene (Fs56.2±0.4Wo1.9±0.1 Fe/Mn=33.0±0.3, Mg#=42.7±0.4, N=12), high-Ca pyroxene (Fs23.1±0.5Wo44.6±0.4, Fe/Mn=30.9±0.9, N=12), plagioclase (An82.7±2.Or0.9±0.5, N=6).

Classification: HED achondrite (Eucrite breccia). Based on ophitic texture and mineral compositions (Fe/Mn and Mg#) of pyroxenes, this sample is an equilibrated basaltic eucrite breccia M-S2 low weathering.

Specimens: Marc Jost holds the main mass. A polished thin section and 2 slices totaling 25.5 g are on deposit at App.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Rissani, Morocco
Date:P 2015
Mass (g):2850
Pieces:1
Class:Eucrite-br
Shock stage:M-S2
Weathering grade:low
Ferrosilite (mol%):56.2±0.4; 23.1±0.5
Wollastonite (mol%):1.9±0.1; 44.6±0.4
Magnetic suscept.:2.84
Classifier:A. Love, App
Type spec mass (g):25.5
Type spec location:App
Main mass:Marc Jost (SJS)
Finder:Unknown
Comments:Submitted by Anthony Love
Institutions
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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