Meteoritical Bulletin: Entry for Northwest Africa 1979

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Northwest Africa 1979

Basic information

Name: Northwest Africa 1979
This is an OFFICIAL meteorite name.
Abbreviation: NWA 1979
Observed fall: No
Year found: 2003
Country: (Northwest Africa)
Mass: 5.12 kg

Classification
history:

Meteoritical Bulletin:	MB 88	(2004)	Mesosiderite-B2
MetBase:	v. 7.1	(2006)	Mesosiderite-B2
Recommended:			Mesosiderite-B2 [explanation]

This is 1 of 10 approved meteorites classified as Mesosiderite-B2. [show all]
Search for other: Class B mesosiderites, Mesosiderites, and Metal-rich meteorites

Writeup

help

Writeup from MB 88:

Northwest Africa 1979

Morocco

Found 2002

Mesosiderite

A 5.12 kg single mass was purchased in Erfoud in 2003. Classification and mineralogy (T. Bunch and J. Wittke, NAU): typical B2 mesosiderite, based on 8 vol % plagioclase, with a partially recrystallized matrix. Modes (vol. %): silicate matrix, 44; metal. 33; eucritic clasts (gabbroic), 12; diogenite grains (up to 1.2 cm), 8; and sulfides, 3. Metal grains are typically > 2 mm with a few cm-size, subrounded to irregular grains; eucrite clasts < 2 cm. Matrix pyroxene, Fs_29.7Wo₂ and Fe/Mn = 28.7; matrix augite, Fs₁₃Wo₄₃; plagioclase, An_89.7. Gabbroic eucrite inverted pigeonite, Fs_30.1Wo₃ and Fe/Mn = 26.9; exsolved augite, Fs_14.8Wo₄₃; plagioclase, An₉₁. Metal , Ni = 6.7 wt %, Co = 0.82 %.Not paired with NWA 1827. Weathered crust, but with very fresh interior. Specimens: 22 g, NAU, main mass, Boswell.

Institutions
and collections

NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 88, MAPS 39, A215-A272 (2004)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

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