header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 18 Aug 2019
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:
Limit to approved meteorite names
Search text:  
Northwest Africa 7576
Basic information Name: Northwest Africa 7576
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7576
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 277 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 372 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 1 Jan 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7576 (NWA 7576)

(Northwest Africa)

Purchased: 14 Dec 2011

Classification: HED achondrite (Howardite)

Petrography: Brecciated meteorite containing abundant diogenetic and subordinate coarse-grained basaltic eucrite clasts set in a fine-grained clastic matrix. Rarely dark cryptocrystalline melt clasts are encountered. Basaltic clasts are composed of exsolved pyroxene, calcic plagioclase and abundant silica polymorphs. Accessory minerals include troilite and chromite. Plagioclase and pyroxene display weak undulatory extinction due to low degree of shock metamorphism.

Geochemistry: Diogenitic orthopyroxene Fs22.2-30.1Wo1.3-4.6, FeO/MnO=22-33; low-Ca pyroxene host Fs26.8-57.3Wo2.7-6.5, FeO/MnO=26-33; augite exsolution lamellae Fs28-28.2Wo41.7-41.9, FeO/MnO=31-34; calcic plagioclase An87.1, range An76.8-93.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 14 Dec 2011
Mass (g):277
Pieces:1
Class:Howardite
Shock stage:low
Weathering grade:moderate
Ferrosilite (mol%):22.2-30.1; 28-28.2
Wollastonite (mol%):1.3-4.6; 41.7-41.9
Classifier:A. Greshake, MNB
Type spec mass (g):22.2
Type spec location:MNB
Main mass:Moritz Karl
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstrasse 43, D-10115 Berlin, Germany (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Michael S. Scherman   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6877 approved meteorites from (Northwest Africa) (plus 2037 unapproved names)

Direct link to this page