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Northwest Africa 13287
Basic information Name: Northwest Africa 13287
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13287
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 705 g
Recommended:  Eucrite    [explanation]

This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 2 May 2020
Writeup from MB 109:

Northwest Africa 13287 (NWA 13287)

(Northwest Africa)

Purchased: 2017

Classification: HED achondrite (Eucrite)

History: Marc Jost (SJS) purchased the 705.4 g sample from Aziz Mouadine August 17, 2017, in Brügg, Switzerland.

Physical characteristics: The sample has a tabular shape and is ~45% coavered by a dark-colored glossy fusion crust. The leading edge is decorated with radial flow lines. The cut face of the sample is light grey in color, unbrecciated, shows flakes of metal and has an interlocking crystalline texture.

Petrography: Description and Classification (A. Love, App) Sample has a fine-grained (avg. grain size 0.5 mm) granoblastic texture with anhedral crystals of: exsolved pyroxene (49 vol%); twinned plagioclase (43 vol%); Si polymorph (6 vol%); ilmenite (1 vol%) and Fe metal (1 vol%). Accesory minerals are: chromite and troilite and rare phosphates.

Geochemistry: (A. Love, App): Low-Ca pyroxene (Fs60.3±0.4Wo2.7±0.5, Fe/Mn=27.2±0.3, Mg#38.8±0.6, n=6); high-Ca pyroxene (Fs27.7±0.3Wo42.4±0.2, Fe/Mn=27.2±0.5, n=6); plagioclase (An92.8±0.2Or0.2±0.0, n=5).

Classification: HED Achondrite (Eucrite). Based on recrystallized texture, equilibrated compositions, Fe/Mn and Mg# of orthopyroxenes, this sample is an unbrecciated, equilibrated basaltic eucrite M-S2 (Stoffler et al., 2018), low weathering.

Specimens: Marc Jost (SJS) holds the main mass. A 26.2 g type specimen and a polished thin section are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Brügg, Switzerland
Date:P 2017
Mass (g):705.4
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):60.3±0.4; 27.7±0.3
Wollastonite (mol%):2.7±0.5; 42.4±0.2
Magnetic suscept.:3.79
Classifier:A. Love, App
Type spec mass (g):26.2
Type spec location:App
Main mass:Marc Jost (SJS)
Comments:Submitted by Anthony Love
   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)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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