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Northwest Africa 10780
Basic information Name: Northwest Africa 10780
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10780
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 21.5 g
Meteoritical Bulletin:  MB 105  (2016)  Mesosiderite
Recommended:  Mesosiderite    [explanation]

This is 1 of 216 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 23 Aug 2016
Writeup from MB 105:

Northwest Africa 10780 (NWA 10780)

(Northwest Africa)

Purchased: Sept 2014

Classification: Mesosiderite

History: Bought in Casablanca, Morocco, in September 2014.

Physical characteristics: A single brownish stone with fusion crust. Cut surface shows a coarse brownish interior with mm metal grains.

Petrography: Crystalline rock with recrystallized texture (triple junctions). Silicates are mainly orthopyroxene (typical size 400 μm) with lower amount of plagioclase and Ca-pyroxene. Abundant metal in elongated grains up to 2 mm. Metal is also found as microscopic grains aligned within silicates. Other minerals: chromite, silica, troilite (to 600 μm), merrillite. Modal abundances: pyroxene 72%, plagioclase 12%, FeNi metal 13%, troilite 4% (from point counting, N=162).

Geochemistry: Orthopyroxene Fs27.3±0.6Wo3.1±0.1, FeO/MnO=27.0±1.4 (N=3). Plagioclase An93.0±2.7Ab6.7±2.6Or0.3±0.1 (N=2). Chromite Cr/(Cr+Al) = 0.77. Magnetic susceptibility log χ (× 10-9 m3/kg) = 5.92.

Classification: Mesosiderite (type C). Low weathering.

Specimens: 5 g and a polished section at CEREGE. Main mass with Labenne.

Data from:
  Table 0
  Line 0:
Place of purchase:Casablanca
Date:P Sept 2014
Mass (g):21.52
Weathering grade:low
Ferrosilite (mol%):27.3±0.6 (N=3)
Wollastonite (mol%):3.1±0.1
Magnetic suscept.:5.92
Classifier:J. Gattacceca, H. Pourkhorsandi, CEREGE
Type spec mass (g):6
Type spec location:CEREGE
Main mass:Labenne Luc
Comments:Submitted by Jérôme Gattacceca
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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