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Northwest Africa 6839
Basic information Name: Northwest Africa 6839
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6839
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass:help 30 g
Classification
  history:
Meteoritical Bulletin:  MB 108  (2020)  R3-6
Recommended:  R3-6    [explanation]

This is 1 of 24 approved meteorites classified as R3-6.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 20 Oct 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 6839 (NWA 6839)

(Northwest Africa)

Purchased: 2010

Classification: Rumuruti chondrite (R3-6)

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

Physical characteristics: Brownish rock without fusion crust.

Petrography: The meteorite is a R-type breccia composed of light colored lithic type 6 fragments and dark impact melt clasts set into a slightly orange colored fine-grained type 3 groundmass with several chondrules and chondrule fragments being present. Olivine is the dominant mineral phase in all lithologies and particular Fe-rich in type 6 clasts. Minor phases include albitic feldspar, augite, chromite, pentlandite, and pyrrhotite. FeNi metal is virtually absent.

Geochemistry: type 3 lithology: olivine: Fa27.4±12.8 (Fa7.9-37.9, n=23); low-Ca pyroxene: Fs15.5±6.9Wo1.1±0.6 (Fs6.7-25.7Wo0.5-2.6, n=16); type 6 lithology: olivine: 38.9±0.4, n=10; low-Ca pyroxene: Fs29.3±0.1Wo1.7±0.1, n=2; Ca-pyroxene: Fs10.4±0.2Wo45.8±0.3, n=3

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 2010
Mass (g):30
Pieces:1
Class:R3-6
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):27.4; 38.9
Ferrosilite (mol%):15.5; 29.3; 10.4
Wollastonite (mol%):1.1; 1.7: 45.8
Classifier:A. Greshake, MNB
Type spec mass (g):7.2
Type spec location:MNB
Main mass:Hanno Strufe
Comments:Submitted by Ansgar Greshake
Institutions
   and collections		 MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7579 approved meteorites from (Northwest Africa) (plus 1969 unapproved names)

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