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Northwest Africa 13907
Basic information Name: Northwest Africa 13907
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13907
Observed fall: No
Year found: 2021
Country: Algeria
Mass:help 158 g
Recommended:  Lunar (anorth)    [explanation]

This is 1 of 78 approved meteorites classified as Lunar (anorth).   [show all]
Search for other: Lunar meteorites
Comments: Approved 6 May 2021
Writeup from MB 110:

Northwest Africa 13907 (NWA 13907)


Purchased: 2021

Classification: Lunar meteorite (anorth)

History: Purchased from Mostafa Hnini in January 2021. Reportedly found in Adrar, Algeria in 2020.

Physical characteristics: Several identically appearing stones found together, no fusion crust, white exterior surface with some tan-colored desert caliche. Saw-cut surface reveals a fragmental breccia of white clasts with some light gray interstitial veins or fine-grained fragments.

Petrography: (C. Agee, UNM) Microprobe examination reveals an anorthitic plagioclase host making up 90-95% of this meteorite. Poikiolitically enclosed in the plagioclase are sparse, small olivine and pyroxene grains (most in the size range 100-200 μm). Larger pyroxene grains are scarce with one larger grain in size range of 1 mm observed in the microprobe mount. Together, olivine and pyroxene make up a total of ~5% of this meteorite.

Geochemistry: (C. Agee, UNM) Olivine Fa38.8±0.7, Fe/Mn=86±6, n=4; low-Ca pyroxene Fs30.8±0.1Wo2.9±0.1, Fe/Mn=55±4, n=4.

Classification: Lunar ferroan anorthosite (FAN), brecciated. Olivine, pigeonite and plagioclase compositional values plot within the FAN suite field (after Warren, 1993).

Specimens: 20 g on deposit at UNM, Matthew Stream holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2021
Mass (g):158
Class:Lunar (anorth)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):38.8±0.7
Ferrosilite (mol%):30.8±0.1
Wollastonite (mol%):2.9±0.1
Classifier:C. Agee, UNM
Type spec mass (g):20
Type spec location:UNM
Main mass:Matthew Stream
Comments:Field name MST-5; submitted by C. Agee, UNM
   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)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 1213 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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