header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 12 Mar 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 4893
Basic information Name: Northwest Africa 4893
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4893
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 180 g
Classification
  history:
Recommended:  Eucrite    [explanation]

This is 1 of 418 approved meteorites classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 12 Mar 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 4893 (NWA 4893)

(Northwest Africa)

Purchased: 2007

Classification: HED achondrite (Eucrite)

History: The meteorite was purchased in 2007 from a local meteorite dealer in Tagounite, Morocco.

Physical characteristics: Greyish fragment partly covered with fusion crust.

Petrography: The meteorite is a polymict breccia composed of up to 1 cm sized basaltic and up to 4 mm sized dark impact melt clasts set into a fine-grained clastic matrix. Dominant minerals are exsolved pyroxene and calcic plagioclase with grain sizes between 50 and 500 µm. Minor phases include silica, chromite, ilmenite, and FeS. No metallic iron was found.

Geochemistry: low-Ca pyroxene: Fs47.9±11.3Wo6.2±1.3 (Fs29.7-68.6Wo2.6-8.9, n=63, FeO/MnO=26-35); Ca-pyroxene: Fs35.7±2.9Wo37.4±3.2 (Fs30.0-41.6Wo30.5-42.6, n=20, FeO/MnO=26-33); calcic plagioclase: An87.5±4. (An80.9-92.3, n=13)

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Tagounite, Morocco
Date:P 2007
Mass (g):180
Pieces:1
Class:Eucrite
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):47.9; 35.7
Wollastonite (mol%):6.2; 37.4
Classifier:A. Greshake, MNB
Type spec mass (g):20.1
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)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6672 approved meteorites from (Northwest Africa) (plus 2024 unapproved names)

Direct link to this page