Meteoritical Bulletin: Entry for Northwest Africa 10637

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Northwest Africa 10637

Basic information

Name: Northwest Africa 10637
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10637
Observed fall: No
Year found: 2016
Country: Morocco
Mass: 554 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	Brachinite
Recommended:			Brachinite [explanation]

This is 1 of 55 approved meteorites classified as Brachinite. [show all]
Search for other: Brachinites, Primitive achondrites

Comments:

Approved 11 Jun 2016

Writeup

help

Writeup from MB 105:

Northwest Africa 10637 (NWA 10637)

Morocco

Purchased: Feb 2016

Classification: Primitive achondrite (Brachinite)

History: Purchased from Moroccan meteorite dealer in 2016.

Physical characteristics: Physical Characteristics: Single stone, rough, oxidized, brown dark exterior. Saw cut reveals a mosaic of shiny, fine-grained crystals.

Petrography: (K. Domanik and F. Stephan, UAz) Microprobe examination of a polished mount shows approximately 87% olivine, 10% low-Ca pyroxene, 3% high-Ca pyroxene texturally equilibrated with triple junctions, silicate grain size 200 – 1200 μm. Oxidized Fe-Ni metal veinlets are present along most grain boundaries. Accessory chromite, Fe-sulfide, oxidized Fe-Ni metal, no plagioclase detected.

Geochemistry: Mineral compositions and geochemistry: (K. Domanik and F. Stephan, UAz) Olivine Fa_26.8±0.3, Fe/Mn=52.1±3.3, n=20; low-Ca pyroxene Fs_22.3±0.1Wo_2.1±0.1, Fe/Mn=32.1±2.2, n=19; augite Fs_9.3±0.2Wo_43.5±0.3, Fe/Mn=24.1±3.6, n=8. Oxygen isotopes: (K. Ziegler UNM) Oxygen isotope values of 3 acid-washed aliquots of bulk sample 1.2, 1.1, 1.8 mg gave δ¹⁷O = 2.402, 2.526, 2.405; δ¹⁸O = 5.048, 5.273, 4.794; Δ¹⁷O = -0.263, -0.258, -0.126 (linearized, all per mil).

Classification: Primitive achondrite (brachinite)

Specimens: 28.3 g including probe mount on deposit at UAz, Blaine Reed holds the main mass.

Data from:
  MB105
  Table 0
  Line 0:

Place of purchase:	Tucson, AZ
Date:	P Feb 2016
Mass (g):	554.2
Pieces:	1
Class:	Brachinite
Fayalite (mol%):	26.8±0.3
Ferrosilite (mol%):	22.3±0.1
Wollastonite (mol%):	2.1±0.1
Classifier:	K. Domanik and F. Stephan, UAz
Type spec mass (g):	28.3
Type spec location:	UAz
Main mass:	Blaine Reed
Comments:	Submitted by K. Domanik

Plots:

O isotopes:

Institutions
and collections

UAz: Lunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721, United States (institutional address; updated 14 Jan 2012)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full

Find references in NASA ADS:
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Geography:

Morocco

Morocco

Coordinates:

Unknown.

Statistics:
This is 1 of 1973 approved meteorites from Morocco (plus 37 unapproved names) (plus 1 impact crater)

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