Revision 2 1 Near end-member shenzhuangite , NiFeS 2 , found in Muong Nong-type tektites from Laos

12 Australasian Muong Nong-type tektites from the locality centered at 16.46150° N, 106.48917° E 13 in Laos contain sporadic spherical heterogeneous sulfide inclusions less than 10 μm in diameter, 14 which have been identified by electron probe microanalyzer and electron back scatter diffraction 15 to represent a mixture of rare mineral shenzhuangite with a pyrrhotite polytype (possibly troilite). 16 Contrary to type shenzhuangite found in the shocked L6 chondrite Suizhou the mineral 17 embedded in the tektite glass is nearly free of copper providing the composition close to its 18 expected end-member not yet found in the nature; the empirical formula closest to ideal end19 member composition based on 4 atoms per formula unit is Ni1.007Fe0.998Cu0.016Co0.058S1.922. The 20 described occurrence also represents the first find of shenzhuangite in terrestrial material. 21