Northwest Africa 13632 (NWA 13632)

Morocco

Purchased: 2019 Dec

Classification: Enstatite chondrite (EH6)

History: The meteorite was purchased by Ziyao Wang from Smara Addi in Tarfaia, Laayoune, Morocco, Dec. 2019

Physical characteristics: The meteorite is weathered highly with some relict fusion crust. The surface color is gray-brown with rusty spots. The Fe-Ni metal and sulfides are visible in the cut.

Petrography: The meteorite shows a granular recrystallized texture composed of enstatite (~65 vol.%, 0.1-0.5 mm in size), plagioclase (15 vol.%, 0.1-0.3 mm in size) and ~20 vol.% opaque minerals (including ~8 vol% Si-bearing kamacite and ~5 vol.% sulfides and schreibersite), no olivine is found. There are a few relict chondrules found in the section. Its weathering is strong with much of the kamacite and sulfides altered to brown limonite.

Geochemistry: Enstatite: En_97.91-98.46Fs_0.27-1.16 Wo_0.93-1.45 (n=12); Plagioclase: An_13.62-14.93Or_2.72-4.62 (n=12); Si-bearing kamacite: Fe=85.99-92.84 wt%, Ni=5.04-7.63 wt%, Si=2.53-3.36 wt% (n=16); Schreibersite: 67.13-72.48 wt% Fe, 12.48-14.88 wt% Ni, 9.53-14.36 wt% P, 0.16-0.22 wt% Si, 0.17-0.30 wt% Co (n=12); Troilite: 35.34-36.43 wt% S, 58.80-63.33 wt% Fe, 0.54-1.31 wt% Cr, 0.06-0.32 wt% Ti (n=10); Cr-bearing sulfides: 52.1-53.1 wt% Fe, 38.89-40.00 wt% S, 3.88-4.78 wt% Cr (n=10).

Classification: Enstatite chondrite (EH6)

Specimens: 72.9 g including one polished thin section are deposited in GUT