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Northwest Africa 4997
Basic information Name: Northwest Africa 4997
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4997
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 50 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  CV3
Recommended:  CV3    [explanation]

This is 1 of 542 approved meteorites (plus 1 unapproved name) classified as CV3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Comments: Approved 31 Mar 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 4997 (NWA 4997)

(Northwest Africa)

Purchased: 2006

Classification: Carbonaceous chondrite (CV3)

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

Physical characteristics: One dark gray fragment without fusion crust weighing 50 g was found.

Petrography: The meteorite displays a dark-grayish interior and is composed of mm-sized chondrules, whitish CAIs, and olivine amoeboids set into a fine-grained, almost opaque matrix. Several chondrules show reddish staining due to terrestrial weathering; no type II chondrules were encountered.

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2006
Mass (g):50
Pieces:1
Class:CV3
Shock stage:medium
Weathering grade:medium
Fayalite (mol%):11.3±13.1 (0.4-45.2, n=46)
Ferrosilite (mol%):1.2±0.4 (0.5-2.1, n=28)
Wollastonite (mol%):1.0±0.1 (0.8-1.3, n=28)
Classifier:A. Greshake, MNB
Type spec mass (g):10.5
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. 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 7483 approved meteorites from (Northwest Africa) (plus 1994 unapproved names)

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