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Northwest Africa 5890
Basic information Name: Northwest Africa 5890
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5890
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass:help 71.2 g
Classification
  history:
Recommended:  Winonaite    [explanation]

This is 1 of 42 approved meteorites classified as Winonaite.   [show all]
Search for other: Primitive achondrites, Winonaites
Comments: Approved 10 Mar 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 5890 (NWA 5890)

(Northwest Africa)

Purchased: 2009

Classification: Primitive achondrite (Winonaite)

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

Physical characteristics: Thirty-six up to 1 cm sized brownish fragments without fusion crust.

Petrography: Sawn surfaces of the fragments show that the meteorite is composed of larger metal-dominated and less abundant silicate-rich regions. Silicate regions display a recrystallized texture dominantly composed of typically 100 to 200 μm sized enstatite, forsteritic olivine, augite, and feldspar grains, with enstatite being the most abundant mineral phase. 120 degree triple junctions are abundant. Metal is kamacite and taenite and has been partly altered to reddish-brownish iron oxides and hydroxides; contains some troilite. Chondrules were not observed.

Geochemistry: olivine: Fa4.0±0.1 (Fa3.8-4.0, FeO/MnO=23±2, n=4); low-Ca pyroxene: Fs6.0±0.2Wo1.7±0.1 (Fs5.7-6.2Wo1.6-1.7, FeO/MnO=27±4, n=4); Ca-pyroxene: Fs2.2±0.2Wo46.4±0.3 (Fs1.9-2.4Wo46.1-46.7, n=5); feldspar: An10.5±1.0Ab87.4±0.9Or2.2±0.2, n=3

Classification: Winonaite (metal rich)

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 2009
Mass (g):71.2
Pieces:36
Class:Winonaite
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):4.0
Ferrosilite (mol%):6.0; 2.2
Wollastonite (mol%):1.7; 46.4
Classifier:A. Greshake, MNB
Type spec mass (g):14.6
Type spec location:MNB
Main mass:Fabien Kuntz
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Kuntz: Fabien Kuntz, France; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7228 approved meteorites from (Northwest Africa) (plus 1998 unapproved names)

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