(The orientation and peculiarities of formation of apatite crystals in the Seligdar deposit.)

Descriptions are given of minerals in the Seligdar deposit, central Aldan region, which have crystallized in an anisotropic stress field. These minerals form linear and linear-planar aggregates, and braided and banded structures in the rocks. The clearly defined stressed nature of the apatite is demonstrated, showing in the formation of stunted pseudo-orthorhombic, pseudo-monoclinic, pseudo-triclinic and spiral forms of crystals. A relict dynamometamorphosed quartz is described in the primary rocks, which have been replaced by apatite-carbonate ores.-D.A.B.