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Northwest Africa 176 | |||||||||||||||||
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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: ![]() | ||||||||||||||||
Classification history: |
This is 1 of 130 approved meteorites (plus 1 unapproved name) classified as Iron, ungrouped. [show all] Search for other: Iron meteorites, Metal-rich meteorites, and Ungrouped irons | ||||||||||||||||
Writeup![]() |
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, Fa11.4±0.3; orthopyroxene, En85.9±0.8Fs11.4±0.6Wo2.7±0.4; clinopyroxene, En51.8±1.9 Fs5.9±0.7Wo42.2±2.4; plagioclase, An49.9±2.7Ab46.5±2.2 Or3.6±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: |
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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) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 85, MAPS 36, A293-A322 (2001)
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Geography: |
Statistics: This is 1 of 7547 approved meteorites from (Northwest Africa) (plus 1970 unapproved names) |