K-feldspar from ultra-potassium syenite, Middle Timan

Previous studies monomineral high-potassium and high-titanium syenite of Middle Timan not give an answer about the type of feldspar, so the establishment of the structural state of this mineral is an urgent task. This feldspar was examined by powder X-ray diffraction, Raman spectroscopy and microprobe analysis. The K-feldspar is monoclinic and belongs to weakly-ordered sanidine. The chemical compositions of sanidine not have any specific, impurities usually are absent or have very low contents, there is the only constant presence of a iron in feldspar composition.