Myadzel V. Typomorphism and applied mineralogy of aegirite from sodium metasomatites of ferriferous-siliceous formation of Pre-Cambrian of the Kryvyi Rig basin.

Localization of bodies of aegirite metasomatites, morphology, chemical composition, physical properties of aegirite is considered. It is shown that the joint influence of geological, mineralogical and physical-and-chemical factors causes the distribution of bodies of aegirite metasomatites in the central parts of sections of ferriferous horizons. Aegirite is presented by macrocrystalline and cryptocrystalline variations. Processes of recrystallization are peculiar to the latter. There are given data on the variability of the chemical composition of aegirite: an increase of silicate compound in primary ferriferous quartzites is naturally accompanied with an increase of contents of isomorphic impurities in the aegirite structure. The cryptocrystalline variation of aegirite is more isomorphically intensive than macrocrystalline. It is proved that the values of optical parameters and density of aegirite have a close correlation with parameters of its chemical composition and mineral structure of primary ferriferous quartzites. Results of vicissitude of hypogenic and hypergenic changes of aegirite are given. Results of mineralogical-and-technological research of aegirite metasomatites are stated and it is proved that an increase in intensity of aegiritization worsens the technological parameters of primary ferriferous quartzites as poor iron ores. At the same time, an intensive aegiritization caused an increase in the contents in ferriferous rocks of scandium, vanadium, and other rare and trace metals.