MOSSBAUER STUDY OF THE LOW-TEMPERATURE CR YSTALLIZATION OF FERRISILICATE FELDSPARS

The crystallization of feldspar ferrisilicate analogues, KFeSi3O8 and RbFeSi3Os8 from gels under low-temperature hydrothermal conditions was investigated by Mossbauer spectroscopy. it was determined that Messba uer spectroscopy methods are more sensitive to changes in a phase stat e of iron-bearing systems than quantitative X-ray phase analysis; the efficiency of Messbauer spectroscopy in the investigations of the crys tallization of iron-bearing mineral systems depends on the use of the modem processing and analysis methods of Messbauer data; feldspar crys tallization in the potassium system is approximately twice as fast as that in the rubidium system; and the dissolution rate of the initial m aterial in the mineral-forming solution is a limiting stage of the low -temperature hydrothermal crystallization of feldspars.