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Northwest Africa 11739
Basic information Name: Northwest Africa 11739
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11739
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 20 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  Achondrite-prim
Recommended:  Achondrite-prim    [explanation]

This is 1 of 14 approved meteorites classified as Achondrite-prim.   [show all]
Search for other: Primitive achondrites
Comments: Approved 19 Apr 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11739 (NWA 11739)

(Northwest Africa)

Purchased: 2017

Classification: Primitive achondrite

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

Physical characteristics: Small light brownish individual without fusion crust. Sawn surface reveals mosaic of shiny, fine-grained crystals.

Petrography: The meteorite shows an equigranular equilibrium texture with abundant triple junctions between adjoining mineral grains. It is predominantly composed of 200-300 µm sized Fe-rich olivine (about 60 vol.%) with less abundant clinopyroxene (about 15 vol.%) and intermediate plagioclase (about 20 vol.%). Minor phases are FeNi metal and sulfides. No orthopyroxene has been detected.

Geochemistry: olivine: Fa31.2±0.1, CaO=0.08±0.1, Cr2O3=0.01±0.1, FeO/MnO=74-96, n=12; Ca-pyroxene: Fs11.2±0.5Wo43.4±0.6, FeO/MnO=34-54, n=12; feldspar: An34.0Ab63.0Or3.0, n=18

Classification: Olivine-rich primitve achondrite with mineral chemistry close to brachinites. However, small grain sizes and high abundance of plagioclase are contrary to brachinites.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 2017
Mass (g):20
Pieces:1
Class:Achondrite-prim
Shock stage:low
Weathering grade:low
Fayalite (mol%):31.2±0.1 (n=12)
Ferrosilite (mol%):11.2±0.5 (n=12)
Wollastonite (mol%):43.4±0.6 (n=12)
Classifier:A. Greshake, MNB
Type spec mass (g):4.2
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. 107, MAPS 55, 460-462
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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