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Northwest Africa 12545
Basic information Name: Northwest Africa 12545
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12545
Observed fall: No
Year found: 2018
Country: Algeria
Mass:help 561 g
Classification
  history:
Recommended:  Brachinite    [explanation]

This is 1 of 45 approved meteorites classified as Brachinite.   [show all]
Search for other: Brachinites, Primitive achondrites
Comments: Approved 15 May 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12545 (NWA 12545)

Algeria

Find: 2018

Classification: Primitive achondrite (Brachinite)

History: The stone was purchased in Agadir in 2018.

Physical characteristics: A single light brown stone with cracks and without fusion crust. Cut face shows a homogeneous dark interior with small crystals.

Petrography: (J. Gattacceca, CEREGE) Dunitic rock with equigranular texture. Olivine, with typical size 250 μm, is the ultradominant mineral (about 90 vol%). Other minerals are Ca-pyroxene, chromite (to 200 μm). Symplectic associations of iron oxi-hydroxides (from weathering of primary metal) and orthopyroxene (10 μm) are found along grain boundaries. Most metal and sulfide are weathered. Metal survives in the form of grains to 20 μm in the silicates. No plagioclase was found.

Geochemistry: Olivine Fa29.3±0.3, Fe/Mn=57.5±4.7 (n=4), Ca-pyroxene Fs10.9±0.2Wo45.1±0.5, Fe/Mn=51.0±17.5 (n=6), low-Ca pyroxene Fs26.2Wo1.1 (n=1), chromite Cr#=0.74.

Classification: Achondrite (brachinite).

Specimens: Type specimen at CEREGE. Main mass with Jean Redelsperger.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Agadir (Morocco)
Date:2018
Mass (g):561
Pieces:1
Class:Brachinite
Weathering grade:high
Fayalite (mol%):29.3±0.5 (n=4)
Magnetic suscept.:4.69
Classifier:J. Gattacceca, CEREGE
Type spec mass (g):22
Type spec location:CEREGE
Main mass:Jean Redelsperger
Comments:work name JR055; submitted by Jérôme Gattacceca
Institutions
   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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 961 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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