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Northwest Africa 12752
Basic information Name: Northwest Africa 12752
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12752
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 550 g
Classification
  history:
Recommended:  Ureilite    [explanation]

This is 1 of 515 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 3 Sep 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12752 (NWA 12752)

(Northwest Africa)

Purchased: 2015

Classification: Ureilite

History: Marc Jost purchased this 550 g sample in Rissani, Morocco, in 2015.

Physical characteristics: The exterior is dark brown in color and the sample has a rounded shape with a flattened side. The sample is partially coated in a weathered patina of caliche. Underneath the caliche is a flow-lined fusion crust. The fusion crust shows the sample was originally oriented. The cut face shows a crystalline interior.

Petrography: Description and Classification (A. Love, App) Sample shows protogranular texture composed of 28 vol% twinned, poikilitic pigeonite (avg. length 3.4 mm) containing rounded olivine chadacrysts and 1.4 mm irregularly shaped olivine. Olivine contains reduction rims (~26.7 μm thick) showing magnesian compositions and Fe metal along grain boundaries and fractures. Up to 200 μm graphite laths present.

Geochemistry: (A. Love, App) Olivine: cores Fa12.9±0.2, Fe/Mn=26.6±2.0, Cr2O3=0.7±0.0; Reduced Rims Fa9.6±1.9, Fe/Mn=18.7, Cr2O3=0.7±0.0 N=12; Pigeonite Fs11.8±0.1Wo9.6±0.0, Fe/Mn=15.4±0.4, N=10.

Classification: Achondrite (Ureilite) Based on textures and mineralogy, this is a ureilite. The thickness of the reduction rims on olivine and medium hardness indicate this sample has experienced a reduction level R2. U-S3 based upon undulatory extinction and planar fractures in olivine. W3.

Specimens: Marc Jost (SJS) holds the main mass. One endcut and a sliced chunk weighing 39.3 g, a polished thin section and mount are on deposit at App.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Rissani, Morocco
Date:P 2015
Mass (g):550
Pieces:1
Class:Ureilite
Shock stage:U-S3
Weathering grade:moderate
Fayalite (mol%):12.9±0.2 (cores, N=12); 9.6±1.9 (rims, N=12)
Ferrosilite (mol%):11.8±0.1
Wollastonite (mol%):9.6±0.0
Magnetic suscept.:4.14
Classifier:A. Love, App
Type spec mass (g):39.3
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 7005 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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