Meteoritical Bulletin: Entry for Northwest Africa 7874

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Northwest Africa 7874

Basic information

Name: Northwest Africa 7874
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7874
Observed fall: No
Year found: 2013
Country: Morocco
Mass: 873 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 616 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 29 May 2013

Writeup

help

Writeup from MB 102:

Northwest Africa 7874 (NWA 7874)

Morocco

Purchased: Feb 2013

Classification: HED achondrite (Eucrite)

History: Purchased by Mendy Ouzillou and an anonymous collector from a Moroccan meteorite dealer, February 2013.

Physical characteristics: Single stone, shiny black fusion crust, saw cut reveals fresh, light-gray, fine-grained groundmass.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a protogranular texture with ~50% pyroxene and 45% plagioclase, grain size 10-100 μm, many pyroxenes with exsolution lamellae. Accessory silica, ilmenite, and chromite.

Geochemistry: (C. Agee and L. Burkemper, UNM) Low Ca-pyroxene Fs_60.6±1.7Wo_3.0±1.9, Fe/Mn=33±1, n=14; high-Ca pyroxene Fs_27.6±0.6Wo_42.3±0.8, Fe/Mn=34±1; n=7; plagioclase Or_0.5±0.0Ab_10.9±0.5An_88.7±0.5, n=3.

Classification: Achondrite (Eucrite). Equilibrated main group eucrite.

Specimens: 20.8 g including a probe mount on deposit at UNM, Mendy Ouzillou and an anonymous collector hold the main mass.

Data from:
  MB102
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P Feb 2013
Mass (g):	873
Pieces:	1
Class:	Eucrite
Ferrosilite (mol%):	60.6±1.7, 27.6±0.6
Wollastonite (mol%):	3.0±1.9, 42.3±0.8
Classifier:	C. Agee, UNM
Type spec mass (g):	20.8
Type spec location:	UNM
Main mass:	Mendy Ouzillou
Comments:	Submitted by C. Agee

Institutions
and collections

UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015

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Geography:

Morocco

Morocco

Coordinates:

Unknown.

Statistics:
This is 1 of 2163 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater)

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