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Northwest Africa 14091
Basic information Name: Northwest Africa 14091
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14091
Observed fall: No
Year found: 2013
Country: Algeria
Mass:help 37 g
Classification
  history:
Recommended:  Eucrite    [explanation]

This is 1 of 513 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 6 Jul 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 14091 (NWA 14091)

Algeria

Find: 2013 Dec

Classification: HED achondrite (Eucrite)

History: The meteorite was found near Tindouf (southwest Algeria).

Physical characteristics: A single stone with fine fusion crust and some rust stains. The sawn surfaces display several clasts and clastic matrix. The sample shows fracturing and granulation resulting from the shock effects.

Petrography: (R. Kared and A.Seddiki, UO-MBA, and B. Moine, UJM) The polished surface of the sample shows a brecciated texture composed of dark-gray clasts (from a few mm up to 1 cm) in a finer-grained matrix. Microscopically the sample presents four different textures with only one lithology. The first is subophitic represented by large grains of pyroxene and plagioclase. The second one is ophitic texture represented by small grains, the third one is very fine-grained texture including some large crystals and finally, the last one is fine-grained texture in which there are large grains of pyroxene. This sample contains exsolved pigeonite, plagioclase, chromite, ilmenite, silica, titanomagnetite, iron metal and apatite.

Geochemistry: Mineral compositions and geochemistry: (R. Kared and A.Seddiki, UO-MBA, and B. Moine, UJM) Major and minor element chemistry of mineral phases was determined using an electron microprobe at Magmas and Volcanoes laboratory (LMV)-Clermont-Ferrand-France. Electron microprobe analyses showed pyroxene compositions of Wo5.47-28.01 En33.35-40.3Fs38.65-55.21 for pigeonite, Wo2-4.39En38.74-44.91Fs53.09-56.95 for low calcium pyroxene and Wo21.01-42.07 En32.21-36.88Fs25.71-42.55 for high calcium pyroxene. All Fe/Mn ratios lie between 25.8 and 36.44. The plagioclases are mainly bytownites An72.24-90.91Or0.25-2.8. Chromite Cr# 81.4-81.5 (100*Cr/(Cr+Al)). Oxygen isotopes: (R.C. Greenwood, OU) The oxygen isotopic composition obtained on two aliquots of this sample is δ17O = 1.807±0.008 ‰ (2σ); δ18O = 3.889±0.004 ‰ (2σ); Δ17O = -0.231±0.026 ‰ (2σ).

Classification: HED achondrite (Monomict eucrite breccia).

Specimens: Main mass with B. Moine, type specimen at MNHNP

Data from:
  MB110
  Table 0
  Line 0:
Date:2013 Dec
Mass (g):37
Pieces:1
Class:Eucrite
Shock stage:S3
Weathering grade:minor
Ferrosilite (mol%):38.65-55.21, 25.71-42.55
Wollastonite (mol%):5.47-285, 21-42.07, 2-4
Classifier:R. Kared and, A. Seddiki, UO-MBA, and B.Moine, UJM
Type spec mass (g):8.19
Type spec location:MNHNP
Main mass:Bertrand Moine
Comments:Submitted by Ratiba KARED
Plots: O isotopes:  
Institutions
   and collections
MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
UJM: Université Jean Monnet, Saint-Etienne, France (institutional address)
UO-MBA: University of Oran 2 Mohamed Ben Ahmed B.P 1015, El M'naouer, Oran, 31000, Algeria (institutional address; updated 6 Jul 2021)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
Ratiba Kared      
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1133 approved meteorites from Algeria (plus 27 unapproved names) (plus 4 impact craters)

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