header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 28 Sep 2020
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Include past classifications in search
Limit to approved meteorite names
Search text:  
Northwest Africa 7229
Basic information Name: Northwest Africa 7229
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7229
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 125 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 348 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 7229 (NWA 7229)

(Northwest Africa)

Purchased: 2011

Classification: HED achondrite (Eucrite, polymict)

Petrography: The meteorite is almost completely covered by fusion crust and displays a fresh greyish interior. Different lithic clast are easily discernible and include basaltic lithologies with different grain sizes and dark melt clasts. Mineral fragments are calcic plagioclase and different pyroxenes, i.e. exsolved Ca-rich pyroxenes and often chemically zones Ca-poor pyroxenes. Minor phases are SiO2, chromite, and pyrrhotite.

Geochemistry: opx: Fs4-62.5Wo0.8-5, FeO/MnO=27-36; cpx: Fs17.7-33.2Wo42.1-44.9, FeO/MnO=28-33; calcic plagioclase: An93 (range 89.1-94.8. Orthopyroxenes display compositional zoning with cores as low as Fs4.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 2011
Mass (g):125
Pieces:2
Class:Eucrite-pmict
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):4-62.5; 17.7-33.2
Wollastonite (mol%):0.8-5; 42.1-44.9
Classifier:A. Greshake, MNB
Type spec mass (g):20.2
Type spec location:MNB
Main mass:Stefan Ralew
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7377 approved meteorites from (Northwest Africa) (plus 1955 unapproved names)

Direct link to this page