СУЛЬФАТСОДЕРЖАЩИЙ АПАТИТ КЯХТИНСКОГО СИЛЛИМАНИТОВОГО МЕСТОРОЖДЕНИЯ (ЗАПАДНОЕ ЗАБАЙКАЛЬЕ)

Abstract

It was detected that sillimanite rocks of Kyakhtinskoe deposit contain several generations of apatite with different chemical compositions. They associate with lazulitc, wagncritc, woodhouseitc, svanbergitc, baritc, muscovitc, rutile, hematite and some other minerals. One among those generations of apatite is characterized by high contents of sodium and the sulfatc sulfur. And variations of Na and S0.i contents arc accompanied by corresponding changes in amounts of phosphate-ion and calcium, that assumes the existence of isomorphism by the scheme Ca-Na = PO,(-SO4. In some cases amount of sulfatc-ion (f. u.) in apatite is comparable with quantity of phosphate-ion, that indicate for possibility of the sulfate-apatite presence in Kyakhtinskoe deposit.