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Northwest Africa 10140
Basic information Name: Northwest Africa 10140
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10140
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 68 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  Lunar (troctolitic anorthosite)
Recommended:  Lunar (troct. anorth.)    [explanation]

This is 1 of 3 approved meteorites classified as Lunar (troct. anorth.).   [show all]
Search for other: Lunar meteorites
Comments: Approved 31 May 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 10140 (NWA 10140)

(Northwest Africa)

Purchased: 2015 Feb

Classification: Lunar (troctolitic anorthosite)

History: Purchased by Larry Atkins in Morocco in February 2015.

Physical characteristics: Single stone. A saw cut reveals a very fine-grained, light-gray groundmass, crosscut by numerous shock melt veins some up to 3 mm.

Petrography: (C. Agee, UNM) This meteorite is a fine-grained anorthositic troctolite (Prinz and Keil, 1977) with plagioclase (75%), olivine (15%), and low-Ca pyroxene (10%) as dominant silicate phases. There are numerous shock melt domains present, some with quench spinifex textures. Accessory troilite and chromite were observed.

Geochemistry: (C. Agee and N. Muttik, UNM) olivine Fa23.4±2.8, Fe/Mn=90±4, n=11; low Ca pyroxene Fs20.5±1.1Wo3.7±0.9, Fe/Mn=56±6, n=9; plagioclase An97.1±1.0Ab2.7±1.0Or0.2±0.0, n=5; Shock melt (20 μm defocused electron beam, proxy for bulk meteorite composition): SiO2=42.1±0.3, TiO2=0.13±0.04, Al2O3=27.3±3.1, Cr2O3=0.11±0.04, MgO=7.8±2.7, FeO=4.4±1.5, MnO=0.05±0.02, CaO=15.4±1.4, NiO=0.00±0.00, Na2O=0.27±0.03, K2O=0.00±0.00 (all wt%), Fe/Mn=89±35, Mg#=75.9±0.8, MgO+FeO=12.1±4.2 (wt%), n=12.

Classification: Lunar (troctolitic anorthosite) based on Stoeffler et al. (1980).

Specimens: 14 g including a probe mount on deposit at UNM, Larry Atkins holds the main mass.

Bibliography:
  • Prinz M. and Keil K. (1977) Mineralogy, petrology and chemistry of ANT-suite rocks from the lunar highlands. Phys. Chem. Earth 10, 215-237 (link)
  • Stoeffler D., Knoell H.-D., Marvin U.B., Simonds C.H., and Warren, P.H. (1980) Recommended classification and nomenclature of lunar highland rocks - A committee report. In: Conference on the Lunar Highlands Crust, Houston, Tex., November 14-16, 1979, Proceedings. (A81-26201 10-91) New York and Oxford, Pergamon Press, 1980, p. 51-70. (link)
Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2015 Feb
Mass (g):68
Pieces:1
Class:Lunar (troctolitic anorthosite)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):23.4±2.8
Ferrosilite (mol%):20.5±1.1
Wollastonite (mol%):3.7±0.9
Classifier:C. Agee, UNM
Type spec mass (g):14
Type spec location:UNM
Main mass:Larry Atkins
Comments:Field name LA-1; submitted by C. Agee, UNM
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8025 approved meteorites from (Northwest Africa) (plus 1951 unapproved names)

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