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Northwest Africa 7910
Basic information Name: Northwest Africa 7910
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7910
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass:help 499 g
Meteoritical Bulletin:  MB 102  (2013)  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
Comments: Approved 27 Jul 2013
Writeup from MB 102:

Northwest Africa 7910 (NWA 7910)

(Northwest Africa)

Purchased: Sept 2009

Classification: Mesosiderite (group B2)

History: A portion of the original sample was donated by Mr. Fred Olsen to Cascadia on June 29, 2010.

Physical characteristics: The fully crusted individual is oriented with a relatively flat leading side and some radial flow lines. No rusting is evident in cut faces.

Petrography: (A. Ruzicka and K. Farley, Cascadia) Thin-section examination shows a silicate-metal breccia with ~45-50% metal, ~10-15% troilite, and minor to moderately deformed mineral and lithic clasts dominated by low-Ca pyroxene and plagioclase set in a granoblastic matrix of pyroxene, plagioclase, and silica mineral. The largest lithic clast is a ~1-cm-diameter gabbro clast with low-Ca pyroxene, high-Ca pyroxene, plagioclase, and silica mineral. Metal is minimally weathered (grade W1).

Geochemistry: (K. Farley and A. Ruzicka, Cascadia) Phase compositions vary somewhat between and within clasts: low-Ca pyroxene Wo3.9±0.7 Fs34.7±3.1 Fe/Mn =23.7±7.5 (N=297), plagioclase An92.8±2.7 Or0.5±0.8 (N=238) (atomic units). Pyroxene clasts, and grains within the gabbro clast, sometimes have FeO-poor rims.

Classification: Stony-iron (mesosiderite). Textures and mineralogy suggest a group B mesosiderite of textural type 2, but the meteorite is unusually rich in troilite.

Specimens: 20.6 g in two slices and a polished thin section are on deposit at Cascadia. Mr. Ronnie McKenzie holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Denver, Colorado, USA
Date:P Sept 2009
Mass (g):499
Shock stage:moderate
Weathering grade:W1
Ferrosilite (mol%):34.7±3.1
Wollastonite (mol%):3.9±0.7
Classifier:A. Ruzicka, Cascadia
Type spec mass (g):20.6
Type spec location:Cascadia
Main mass:Ronnie McKenzie
Comments:Lab number CML0613, Field number RM-II.; submitted by A. Ruzicka
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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