Meteoritical Bulletin: Entry for Northwest Africa 10476

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Northwest Africa 10476

Basic information

Name: Northwest Africa 10476
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10476
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass: 46 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	Eucrite-cm
Recommended:			Eucrite-cm [explanation]

This is 1 of 48 approved meteorites classified as Eucrite-cm. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 13 Apr 2016

Writeup

Writeup from MB 105:

Northwest Africa 10476 (NWA 10476)

(Northwest Africa)

Purchased: 2015

Classification: HED achondrite (Eucrite, cumulate)

History: The meteorite was purchased from the Moroccan meteorite dealer Med Lamine Ahmed.

Physical characteristics: Two small individuals partly covered with fusion crust were recovered from the north-African Sahara.

Petrography: The meteorite displays a light-grayish interior and is dominantly composed of large blocky low-Ca pyroxene and plagioclase. The mm-sized pyroxene grains often contain blobby augite. Minor phases include chromite and SiO₂ polymorphs. The meteorite is highly shocked, i.e., plagioclase is partly converted to maskelynite.

Geochemistry: low-Ca pyroxene: Fs_35.2±0.2Wo_2.6±0.1(Fs_35.2-35.9Wo_2.4-2.7, n=16, FeO/MnO=28-30), Ca-pyroxene: Fs_15.2±0.1Wo_43.1±0.3(Fs_15-15.4Wo_42.6-43.6, n=15, FeO/MnO=30-31); calcic plagioclase: An_84.9±0.8(An_83.6-86.2, n=25)

Data from:
  MB105
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2015
Mass (g):	46
Pieces:	2
Class:	Eucrite-cm
Shock stage:	strong
Weathering grade:	low
Ferrosilite (mol%):	35.2
Wollastonite (mol%):	2.60
Classifier:	A. Greshake, MNB
Type spec mass (g):	9.2
Type spec location:	MNB
Main mass:	Philippe Schmitt-Kopplin
Comments:	Submitted by Ansgar Greshake

Institutions
and collections

MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)

Catalogs:

References:

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

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 7543 approved meteorites from (Northwest Africa) (plus 1973 unapproved names)

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