Based on an ore-spots investigation report by No. 311 Geological Party, the authors found some natural moissanites in both artificial heavy sands and thin-sections from the Dongjiashan serpentinite in south Dabie Mountains. The single crystals from the artificial heavy sands are mostly hexagonal,partly irregular and occasionally rhombohedral. The crystals are commonly 250 μm×150 μm in size, with the largest one being 450 μm×100 μm. Some relatively small moissanites were found in thin sections. The Raman shifts of moissanites both[CM(46] as single crystals and as crystals in thin sections are typical and stable. Natural single crystal moissanites are mostly biaxial (+),and subordinately uniaxial (+). However, almost all the moissanites in thin sections are characterized by biaxial crystals (+) with the 2Eup to>20. Although the natural moissanites are considered to be existent in any rocks, the autochthonous natural moissanites can only be found in some kimberlites and meteorites.The moissanite reported here is probably the first occurrence in serpentinites. As both moissanite and diamond have similar tetrahedrally oriented sp3 hybrid bonds and identical glide planes, the behavior of moissanite under stress should be comparablewith that of diamond. It is thus considered that the primary moissanite might have been formed at the depth of ≥300 km, and that it is very important to understand the tectonic evolution of its host rock.