Meteoritical Bulletin: Entry for Northwest Africa 176

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Northwest Africa 176

Basic information

Name: Northwest Africa 176
This is an OFFICIAL meteorite name.
Abbreviation: NWA 176
Observed fall: No
Year found: 1999
Country: (Northwest Africa)
Mass: 2 kg

Classification
history:

NHM Catalogue:	5th Edition	(2000)	Iron-ung
Meteoritical Bulletin:	MB 85	(2001)	Iron-ung
MetBase:	v. 7.1	(2006)	Iron-ung
Recommended:			Iron, ungrouped [explanation]

This is 1 of 137 approved meteorites (plus 1 unapproved name) classified as Iron, ungrouped. [show all]
Search for other: Iron meteorites, Metal-rich meteorites, and Ungrouped irons

Writeup

help

Writeup from MB 85:

Northwest Africa 176

Possibly near Morocco/Algeria Border

Found 1999

Iron meteorite with silicate inclusions (ungrouped)

A 2 kg stone was purchased in Morocco by Geoffrey Cintron. Classification and mineralogy (K. Keil, E. Scott and M. Liu, UHaw): a fresh iron with lightly shocked (S1) greenish-yellow polymineralic silicate inclusions (40 vol%) 1–10 mm in size; olivine, Fa_11.4±_0.3; orthopyroxene, En_85.9±_0.8Fs_11.4±_0.6Wo_2.7±_0.4; clinopyroxene, En_51.8±_1.9Fs_5.9±_0.7Wo_42.2±_2.4; plagioclase, An_49.9±_2.7Ab_46.5±_2.2Or_3.6±_0.7; weathering grade, W0. Metal composition (J. Wasson, UCLA): Co = 0.413 wt%, Ni = 8.66 wt%, Cu = 318 ppm, Ga = 17.7 ppm, Ge ≈160 ppm, As = 9.12 ppm, Ir = 3.56 ppm, Au = 0.853 ppm. Oxygen isotopes (R. Clayton and T. Mayeda, UChi): silicate inclusions, δ₁₇O = –6.5·, δ₁₈O = –2.5·. Oxygen isotopes and bulk chemistry show that this is an ungrouped iron closely related to the Bocaiuva iron with silicate inclusions. Specimens: main mass with G. Cintron, 164 Scooter Lane, Hicksville, NY 11801, USA; type specimen, 68 g, UHaw.

Data from:
  MB85
  Table 4
  Line 90:

Origin or pseudonym:	near Algerian border
Date:	1999
Mass (g):	2000
Pieces:	1
Class:	Iron Ung.

Plots:

O isotopes:

Institutions
and collections

UChi: University of Chicago, Chicago, IL 60637, United States (institutional address; updated 28 Feb 2011)
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
UHaw: Hawai'i Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawai'i, 2525 Correa Road, Honolulu, HI 96822, United States (institutional address; updated 25 Oct 2011)

Catalogs:

Search for this meteorite in the Natural History Museum collection (U.K.):

References:

Published in Meteoritical Bulletin, no. 85, MAPS 36, A293-A322 (2001)

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Photos:

Credit	Photos
Photos from the Encyclopedia of Meteorites:
Don Edwards
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Jay Piatek
Roberto Vargas

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8136 approved meteorites from (Northwest Africa) (plus 1942 unapproved names)

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