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Northwest Africa 7804
Basic information Name: Northwest Africa 7804
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7804
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 331 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  Mesosiderite
Recommended:  Mesosiderite    [explanation]

This is 1 of 221 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 14 May 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 7804 (NWA 7804)

(Northwest Africa)

Purchased: Sep 2011

Classification: Mesosiderite

History: Purchased from A. Bouragaa.

Physical characteristics: A mostly complete stone was found. Fusion crust is textured and black, broken surfaces are light green with exposed crystals up to 2 cm in diameter.

Petrography: (J. Utas and A.E. Rubin, UCLA) The sample is composed of approximately 35% metal by volume, with 5-10% accessory troilite. Silicate minerals consisted of pyroxene (75%) and anorthite (25%), with rare olivine (<1% vol). Some kamacite exhibits disseminated silica and rounded taenite grains. A few 20-60 μm grains of olivine were found petrographically.

Geochemistry: Mineral compositions and geochemistry: (J. Utas, UCLA) Anorthite: An89.7Ab9.8Or0.49 (n=7)

Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Ouarzazate
Date:P Sep 2011
Mass (g):331.2
Pieces:1
Class:Mesosiderite
Shock stage:S1
Weathering grade:low
Fayalite (mol%):41.3±3.8 (n=2)
Ferrosilite (mol%):30.21±0.34 (n=13)
Wollastonite (mol%):2.40±0.46 (n=13)
Classifier:J. Utas and A.E. Rubin, UCLA
Type spec mass (g):30.1
Type spec location:UCLA
Main mass:Utas
Finder:anonymous
Comments:[U12/NWAU459]; submitted by J. Utas
Institutions
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 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:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8025 approved meteorites from (Northwest Africa) (plus 1951 unapproved names)

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