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Northwest Africa 8742
Basic information Name: Northwest Africa 8742
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8742
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 85 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  Mesosiderite-B3
Recommended:  Mesosiderite-B3    [explanation]

This is the only approved meteorite classified as Mesosiderite-B3.
Search for other: Class B mesosiderites, Mesosiderites, and Metal-rich meteorites
Comments: Approved 27 Feb 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 8742 (NWA 8742)

(Northwest Africa)

Purchased: April 2014

Classification: Mesosiderite-B3

History: One stone found by nomads was received from Mr. Aziz Habibi in Arfoud, Morocco, in April, 2014.

Physical characteristics: A single stone of 85 g total weight is a fractured fragment of meteorite. A surface of the sample is ragged, ~5% of the sample surface is covered by fusion crust

Petrography: (C. A. Lorenz, Vernad.) The meteorite is a medium-grained metabreccia of silicates and Fe-Ni metal. The meteorite has poikiloblastic texture and is composed of (vol.%) 100-300 μm anhedral grains of dissolved pyroxene (65.8), 50-200 μm anhedral grains of feldspar (13.1), metal (8.0), hydroxides (13.1) and angular pyroxene megacrysts (up to 5 mm); minor minerals are a silica phase, phosphate, chromite, troilite and schreibersite. Metal is composed of kamacite and taenite.

Geochemistry: (N. N. Kononkova, Vernad, EMP) pyroxene Fs28.6Wo2.8 (Fe/Mn=26.2); Fs12.8Wo42.3; feldspar An90.9Ab8.1; kamacite (wt.%) Ni =5.79, Co = 0.63, P = 0.12; taenite: Ni = 37.2-49.9, Co = 0.11-0.23.

Classification: Mesosiderite-B3. Moderate weathering.

Specimens: A type specimen of 27.37 g, one thin section and one polished thick section are on deposit at Vernad. DMUH holds the main mass.

Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P April 2014
Mass (g):85
Pieces:1
Class:Mesosiderite-B3
Ferrosilite (mol%):28.6
Wollastonite (mol%):2.8
Classifier:C. A. Lorenz, Vernad, F. Brandstaetter, NHMV
Type spec mass (g):27.37
Type spec location:Vernad
Main mass:DMUH
Comments:Field Name is MS2014; analyst N.N. Kononkova (Vernad); submitted by C. A. Lorenz
Institutions
   and collections
NHMV: Naturhistorisches Museum, Burgring 7, 1010 Wien, Austria, Austria; Website (institutional address; updated 18 Jan 2019)
Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016)
DMUH: Dedovsk Museum of Universe History, Russia; Website (institutional address; updated 26 Sep 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7912 approved meteorites from (Northwest Africa) (plus 1974 unapproved names)

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