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Northwest Africa 7222
Basic information Name: Northwest Africa 7222
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7222
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 180 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 409 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 11 Dec 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7222 (NWA 7222)

(Northwest Africa)

Purchased: 2011

Classification: HED achondrite (Eucrite, polymict)

Petrography: The rock is partly covered with fusion crust and displays a dark greyish interior. It is composed of up to 2-mm-sized basaltic, melt and mineral clasts set into a fine-grained clastic matrix. Mineral clasts and dominant matrix minerals are calcic plagioclase and pyroxenes with very fine exsolution lamellae. Accessory phases include SiO2, chromite, and troilite. Contains ~5% diogenitic material.

Geochemistry: Ca-poor pyroxene: Fs31.9-60.7Wo4.8-13.6, FeO/MnO=23-33; Ca-rich pyroxene: Fs45.1-65.2Wo20.2-37.9, FeO/MnO=27-49; calcic plagioclase: An87.4 (range 82.3-91.4).

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Ensisheim, France
Date:P 2011
Mass (g):180
Pieces:1
Class:Eucrite-pmict
Shock stage:low
Weathering grade:moderate
Ferrosilite (mol%):31.9-60.7; 45.1-65.2
Wollastonite (mol%):4.8-13.6; 20.2-37.9
Classifier:A. Greshake, MNB
Type spec mass (g):22.2
Type spec location:MNB
Main mass:Harald Stehlik
Comments:Submitted by Ansgar Greshake
Institutions
   and collections		 MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Stehlik: Harald Stehlik, 1220 Wien, Austria (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)
Also see:
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Revision
  history:
  This lists important revisions made to data for this record.

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