Meteoritical Bulletin: Entry for Northwest Africa 7824

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Northwest Africa 7824

Basic information

Name: Northwest Africa 7824
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7824
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 59 g

Classification
history:

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

This is 1 of 240 approved meteorites classified as Mesosiderite. [show all]
Search for other: Mesosiderites, Metal-rich meteorites

Comments:

Approved 14 Nov 2013

Writeup

help

Writeup from MB 102:

Northwest Africa 7824 (NWA 7824)

(Northwest Africa)

Purchased: 2011 Oct

Classification: Mesosiderite

History: Purchased by Mike Bandli in October 2011 from a dealer in Erfoud, Morocco.

Physical characteristics: Exceptionally fresh specimen (59 g) with evident metal, sulfide and honey-yellow silicate grains.

Petrography: (A. Irving and S. Kuehner, UWS) Metamorphosed breccia composed of larger, angular monomineralic (and some polymineralic) clasts in a recrystallized matrix of related crystal debris. Composed of abundant orthopyroxene with interstitial anorthitic plagioclase, holly leaf-shaped grains of kamacite (~ 8 vol.%), Fe-sulfide (~ 4 vol.%), taenite, chromite and Na-bearing merrillite. The only evidence of terrestrial weathering is very slight staining on some fractures in pyroxene.

Geochemistry: Orthopyroxene (Fs_26.2-26.3Wo_1.9-1.5; FeO/MnO = 29-31). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed silicate material by laser fluorination gave, respectively: δ¹⁷O = 1.708, 1.684 δ¹⁸O = 3.757, 3.718; Δ¹⁷O = -0.276, -0.279 (all per mil).

Classification: Mesosiderite.

Specimens: 12 g of material and one polished thin section are at UWB. The remaining material is held by Mr. M. Bandli.

Data from:
  MB102
  Table 0
  Line 0:

Place of purchase:	Erfoud
Date:	P 2011 Oct
Mass (g):	59
Pieces:	1
Class:	Mesosiderite
Shock stage:	low
Weathering grade:	W0/1
Ferrosilite (mol%):	26.2-26.3
Wollastonite (mol%):	1.9-1.5
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	12
Type spec location:	UWB
Main mass:	M. Bandli
Comments:	B314; submitted by A. Irving

Plots:

O isotopes:

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)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)

Catalogs:

References:

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

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Anna Morris

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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