Meteoritical Bulletin: Entry for Northwest Africa 7795

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Northwest Africa 7795

Basic information

Name: Northwest Africa 7795
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7795
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass: 218 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	Iron, IAB-ung
Recommended:			Iron, IAB-ung [explanation]

This is 1 of 68 approved meteorites classified as Iron, IAB-ung. [show all]
Search for other: IAB complex irons, Iron meteorites, and Metal-rich meteorites

Comments:

Approved 31 Mar 2016

Writeup

help

Writeup from MB 105:

Northwest Africa 7795 (NWA 7795)

Northwest Africa

Purchased: 2012

Classification: Iron meteorite (IAB, ungrouped)

History: Jason Utas purchased the iron from Gary Fujihara on ebay in late January 2012.

Petrography: As described for NWA 8154, NWA 8155, and NWA 8539, the metal consists of grains 0.20 × 0.15 mm with no evidence of an octahedral pattern. The structures is anomalous. The absence of a pattern suggest fast cooling. The small graphite ellipsoids (sometimes arranged like the petals of a flower) may reflect the locations of the last, C-rich melt to crystallize.

Geochemistry: Composition: Co, 4.72 mg/g; Ni, 136.0 mg/g; Ga, 50.2 μg/g; Ge,~320 μg/g.; As, 16.0 μg/g; Ir 22.0 μg/g; Au, 1.545 μg/g. The meteorite is compositionally a member of the IAB complex.

Classification: The meteorite is classified IAB-ungr. On most element-Au diagrams it plots close to IAB-sLM but there are large deviations in some elements (a factor of 2 for W) and IAB-ungr is the best choice.

Specimens: This meteorite is closely similar to NWA 8154, NWA 8155 and NWA 8539 and appears to be paired with them.

Data from:
  MB105
  Table 0
  Line 0:

Place of purchase:	Tucson
Date:	P 2012
Mass (g):	217.6
Pieces:	1
Class:	Iron, IAB-ung
Weathering grade:	low
Classifier:	J. T. Wasson, UCLA
Type spec mass (g):	30.6
Type spec location:	UCLA
Main mass:	J. Utas
Comments:	Submitted by Wasson, J. Utas

Institutions
and collections

UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 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 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
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