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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 79 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 Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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     This is 1 of 1236 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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