NWA 7920, Saharan Main Group Pallasite, Micromount

$5.00

NWA 7920 was first discovered in 2012 in a remote area of the Saharan Desert in Moroccan. Pieces were brought out by nomads and sold to traders in Morocco. Analysis revealed the stones to be main-group pallasites that are weathered. Most of the original iron has been replaced by veins of hydroxides, but much of the olivine is still quite fresh in some specimens.

Refer to the photo. The black centimeter cube is shown for scale and is not included. You are purchasing one small fragment like the one shown. Your purchase will include a labeled gemjar for safe storage.

From the Meteoritical Bulletin entry on NWA 7920 :

Morocco
Purchased: 2012
Classification: Pallasite (Main group)

History: Purchased by Brahim Tahiri from a Moroccan hunter, 2012.

Physical characteristics: Dark brown irregular exterior, saw cut reveals rounded olivine grains, many 3-5 mm, also up to cm-size, set in a brown oxidized matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows olivine surrounded and penetrated by a matrix of iron oxides or hydroxides. No primary Fe-Ni metal detected.

Geochemistry: (C. Agee and L. Burkemper, UNM) Olivine Fa13.2±0.9, Fe/Mn=45±3, n=5.

Classification: Pallasite, main group.