Columbite from the Strzelin massif, Lower Silesia

Abstract

Columbite, bearing inclusions of tapiolite-mossite, occurs in the quartz-feldspathic pegmatite in the neighbourhood of Romanów village, Strzelin granitoid massif, Lower Silesia. The composition of columbite yielded formula Fe0.60Mn0.31Ti0.16Nb1.97O6 and the X-ray studies revealed its disordered structure. The investigated niobium minerals probably crystallized at temperature close to 200oC rather than to 300-350oC under action of solutions responsible also for alibitization of· microcline.