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Northwest Africa 12223
Basic information Name: Northwest Africa 12223
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12223
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 327 g
Meteoritical Bulletin:  MB 107  (2018)  Eucrite-melt breccia
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 57 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 13 Nov 2018
Writeup from MB 107:

Northwest Africa 12223 (NWA 12223)

(Northwest Africa)

Purchased: 2005 Jun

Classification: HED achondrite (Eucrite, melt breccia)

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

Petrography: (K. Metzler, IfP) Melt breccia, consisting of eucritic basalt clasts (ophitic to subophitic textures) with sizes up to several cm and mineral fragments (pyroxene, plagioclase, silica polymorph), set in a dark matrix. This matrix represents a crystallized melt with subophitic texture consisting of pyroxene and skeletal plagioclase crystals. Melt pockets of partly devitrified glass also occur. Most pyroxene fragments show augite exsolution lamellae. Accessories are ilmenite, chromium spinel, and metal (mostly oxidized).

Geochemistry: Mineral compositions and geochemistry: Low-Ca pyroxene (host; n=10): Fs63.3±0.5Wo2.4±0.3 (Fs62.6-63.9Wo.9-2.8); mean Fe/Mn (at.): 33. Ca-rich pyroxene (exsolution lamellae; n=10) Fs27.8±0.9Wo43.2±0.7 (Fs27.0-30.2Wo41.7-44.0); Plagioclase (n=10): An87.8±1.7 (An84.9-89.9).

Data from:
  Table 0
  Line 0:
Place of purchase:Sainte-Marie-aux-Mines, France
Date:P 2005 Jun
Mass (g):327
Class:Eucrite-melt breccia
Shock stage:strong
Weathering grade:moderate
Ferrosilite (mol%):63.3; 27.8
Wollastonite (mol%):2.4; 43.2
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP, Münster
Main mass:Anonymous
Comments:Submitted by K. Metzler, IfP
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 8138 approved meteorites from (Northwest Africa) (plus 1941 unapproved names)

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