Lunar Meteorite: Northwest Africa 14755 & 14761

from The Meteoritical Bulletin, No. 111

Northwest Africa 14755 (NWA 14755)

(Northwestern Africa)
Purchased: 2021 June
Mass: 386 g (many pieces)

Lunar meteorite (feldspathic breccia)

History: Purchased by Jason Whitcomb in June 2021 from an Algerian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Fine grained breccia composed of numerous small mineral clasts of anorthite, olivine, pigeonite, subcalcic augite and augite, plus some larger basaltic clasts, set in a very fine grained matrix containing troilite, low-Ti chromite and kamacite.

Geochemistry: Olivine (Fa_23.0-45.2, FeO/MnO = 85-110, N = 5), pigeonite (Fs_31.5-44.8Wo_9.3-16.7, FeO/MnO = 52-60, N = 4), subcalcic augite (Fs_22.5-35.4Wo_27.4-23.4, FeO/MnO = 55-57, N = 2), augite (Fs_22.1Wo_35.6, FeO/MnO = 52), anorthite (An_96.8-97.3Or_0.2, N = 3).

Classification: Lunar (feldspathic breccia).

Specimens: 7.42 g including one polished slice at PSF; remainder with Mr. J. Whitcomb.

from The Meteoritical Bulletin, No. 111

Northwest Africa 14761 (NWA 14761)

(Northwestern Africa)
Purchased: 2021 June
Mass: 196 g (many pieces)

Lunar meteorite (feldspathic breccia)

History: Purchased by Jason Whitcomb in June 2021 from an Algerian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Fine grained breccia composed of numerous small mineral clasts of anorthite, olivine, low-Ca pyroxene, subcalcic augite and augite, plus some larger glass-bearing lithic clasts, set in a very fine grained, partly vesicular and partly glassy matrix containing ilmenite, baddeleyite, medium-Ti chromite and kamacite.

Geochemistry: Olivine (Fa_24.2-53.9, FeO/MnO = 89-100, N = 4), low-Ca pyroxene (Fs_18.4-32.8Wo_3.3-4.2, FeO/MnO = 53-58, N = 3), subcalcic augite (Fs_9.2Wo_23.0, FeO/MnO = 47), augite (Fs_17.0-24.5Wo_36.0-32.2, FeO/MnO = 48-54, N = 2), anorthite (An_95.5-96.6Or_0.1, N = 3).

Classification: Lunar (feldspathic breccia).

Specimens: 13.27 g including one polished slice at PSF; remainder with Mr. J. Whitcomb.

Randy Says…

I have not studied Northwest Africa 14755 and 14761. A assume that they are paired from the similar descriptions.

More Information

Meteoritical Bulletin Database

NWA 14755 | 14761