Northwest Africa 13177 (NWA 13177)

Morocco

Find: 2019

Classification: Ordinary chondrite (L3-6)

History: Fabien Kuntz purchased 28 stones (ranging 4.8-338 g) in Guelmin, Morocco, in 2019.

Physical characteristics: Sample has an irregular ovoid shape and is dark brown in color. Chondrules and brecciated texture are visible on the surface.

Petrography: Description and classification: (A. Love, App): Sample is a breccia composed of light-colored, mm-sized chondritic clasts set within dark-colored, host of unequilibrated and equilibrated chondrules and fragments. Type 4, type 6 and carbonaceous (CM-like) lithologies are present. Chondrules within host are poorly equilibrated and have an average apparent diameter of 523µm (n=56). Additional minerals are albitic plagioclase, chromite, phosphate, FeNi metal and troilite.

Geochemistry: (A.Love, App) Host: Olivine (Fa_22.67±3.4, (Fa_15.64-27.19), Fe/Mn=46.8±3.5 n=11); low Ca pyroxene (Fs_14.8±7.0Wo _1.4±2.0 (Fs_6.9-22.9Wo_0.1-4.9), n=5); Equilibrated clasts: Olivine (Fa_24.7±0.7, Fe/Mn=47.8±4.4, n=7); low Ca pyroxene (Type 4 Fs_18.1±7.2Wo_2.7±4.4, n=5; Type 6 Fs_21.4±0.6Wo_1.7±0.2, n=5) Xenolithic clast: Olivine (Fa_2.8±2.2, Fe/Mn=16.2±16.4, n=3); low Ca-pyroxene (Fs_2.7Wo_2.0, n=1).

Classification: Ordinary chondrite (L3-6 xenolithic breccia, C-S3, W1). Based on the textures, mineral compositions, magnetic susceptibility and chondrule diameters, this is an L3-6 chondrite breccia. The xenolith has textures and compositions similar to CM2 carbonaceous chondrites.

Specimens: The main masses are held by Fabien Kuntz. An endcut and slice weighing 28.75 g and a polished thin section are on deposit at App.