The published article by Dmitry Evgenievich Savelyev et al. (See the article in this issue of the journal) is interesting both in terms of the unusual nature of the rheomorphic mechanism of differentiation of matter in mantle ultramafic rocks, which leads to the formation of bodies of chromite-containing dunites of the Krak massifs, and in the presentation of examples of the relationship of minerals in the rocks of these massifs and analysis different hypotheses of the genesis of chromite ore

V.I. Popova,  Institute of Mineralogy UB RAS, Miass; popov@mineralogy.ru

V.A. Popov, Institute of Mineralogy UB RAS, Miass