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Northwest Africa 12225
Basic information Name: Northwest Africa 12225
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12225
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 169 g
Classification
  history:
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 337 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 13 Nov 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 12225 (NWA 12225)

(Northwest Africa)

Purchased: 2007 Jun

Classification: HED achondrite (Eucrite, polymict)

History: Purchased from a Moroccan dealer at the mineral show in Sainte-Marie-aux-Mines, France

Petrography: (K. Metzler, IfP) Polymict breccia consisting of gabbroic and basaltic rock fragments and related debris. Partly brown appearance due to oxidized Ni-free metal. This breccia contains clast-rich impact melt rocks. Accessories are ilmenite, chromium spinel, silica polymorph, and traces of merrilite and zircon.

Geochemistry: Mineral compositions and geochemistry: Basalt clast #1: Pyroxene (n=10): Fs26.7±0.9Wo43.0±0.6 (Fs25.4-28.4Wo42.0-43.9); mean Fe/Mn (at.): 29. Plagioclase (n=10): An74.5±3.9 (An71.2-82.4). Basalt clast #2: Pyroxene (n=10): Fs56.0±0.5Wo5.2±1.1 (Fs55.1-56.6Wo3.7-8.0); mean Fe/Mn (at.): 26. Plagioclase (n=10): An87.3±3.5 (An82.6-92.4).

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Sainte-Marie-aux-Mines, France
Date:P 2007 Jun
Mass (g):169
Pieces:1
Class:Eucrite-pmict
Shock stage:moderate
Weathering grade:moderate
Ferrosilite (mol%):26.7; 56.0
Wollastonite (mol%):43.0; 5.2
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:Anonymous
Comments:Submitted by K. Metzler, IfP
Institutions
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6559 approved meteorites from (Northwest Africa) (plus 2021 unapproved names)

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