Native Si, iron silicide and moissanite from the lower Paleozoic sandstones of the Manitanyrd ridge, the Polar Urals

At the Lower Paleozoic sandstones of the Manitanyrd Ridge (ª3-O1 mn) moissanite have been recently found. It is established that moissanite is presented by two varieties - crystal fragments and granes with aggregate texture. The last ones consist of hexagonal moissanite crystals cemented by native Si. In one of such grains inclusion of iron silicide have been found. Association of moissanite, native Si and iron silicide with iron sulphides and chromite allow to suppose that its formation is depend on the presence of unknown bodies of basic and ultrabasic volcanites as a sourcer of gold mineralization.