Meteoritical Bulletin: Entry for Northwest Africa 4766

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Northwest Africa 4766

Basic information

Name: Northwest Africa 4766
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4766
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass: 290 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	Martian (shergottite)
Recommended:			Martian (shergottite) [explanation]

This is 1 of 330 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all]
Search for other: Martian meteorites

Comments:

Approved 6 Oct 2019

Writeup

help

Writeup from MB 108:

Northwest Africa 4766 (NWA 4766)

(Northwest Africa)

Purchased: 2007

Classification: Martian meteorite (Shergottite)

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

Physical characteristics: Fifteen grayish fragments partly covered with fusion crust.

Petrography: The meteorite shows a diabasic texture of predominantly up to 2 mm sized pigeonite and augite and equally sized maskelynite grains. Pyroxenes display complex patchy compositional zoning and often contain fine exsolution lamellae. Minor phases include ilmenite often intergrown with titanomagnetite, merrillite, and pyrrhotite. The meteorite is highly shocked and contains abundant shock melt veins and pockets.

Geochemistry: pigeonite: Fs_41.7±5.1Wo_13.0±2.2(Fs_32.9-50.1Wo_9.0-17.7, n=15, FeO/MnO=29-38); augite: Fs_25.7±1.9Wo_31.7±2.3(Fs_23.8-29.2Wo_28.7-35.2, n=12, FeO/MnO=27-33); maskelynite: An_53.5±2.0Ab_44.5±1.9Or_2.0±0.4, n=14

Classification: Martian (diabasic shergottite)

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Tagounite, Morocco
Date:	P 2007
Mass (g):	290
Pieces:	15
Class:	Martian (shergottite)
Shock stage:	high
Weathering grade:	moderate
Ferrosilite (mol%):	41.7; 25.7
Wollastonite (mol%):	13.0; 31.7
Classifier:	A. Greshake, MNB
Type spec mass (g):	20
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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9933 approved meteorites from (Northwest Africa) (plus 1837 unapproved names)

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