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Northwest Africa 4993
Basic information Name: Northwest Africa 4993
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4993
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 300 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  H3
Recommended:  H3    [explanation]

This is 1 of 594 approved meteorites (plus 2 unapproved names) classified as H3.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 11 Mar 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 4993 (NWA 4993)

(Northwest Africa)

Purchased: 2005

Classification: Ordinary chondrite (H3)

History: The meteorite was found by an anonymous finder in northwest Africa and bought by the main mass holder in Morocco.

Physical characteristics: One brownish fragment without fusion crust weighing 300 g was found.

Petrography: The sample is an unbrecciated chondrite with unequilibrated olivine and pyroxene in chondrules and matrix, and Fe,Ni-metal. The on average about 0.4 mm sized chondrules are well discernable and of large variation in the textural types.

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2005
Mass (g):300
Pieces:1
Class:H3
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):12.2±8.0 (0.8-26.7, n=36)
Ferrosilite (mol%):10.5±7.0 (1.1-19.9, n=34)
Wollastonite (mol%):0.7±0.2 (0.4-1.0, n=34)
Classifier:A. Greshake, MNB
Type spec mass (g):22.9
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)
Stehlik: Harald Stehlik, 1220 Wien, Austria (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7009 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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