PRINCIPLES OF TYPIFICATION AND INTERPRETATION OF THE X-RAY EXCITED OPTICAL LUMINESCENCE SPECTRA OF NATURAL FLUORITE

摘要

A new 《trinomial》 scheme for typification of the multicomponent typomorphic X-ray excited optical luminescence (XEOL) spectra of fluorite is proposed on the base of detailed analysis of spectral-luminescence, point symmetry and geochemical properties of microdefects in the great amount of fluorspar samples. It is shown that any individual XEOL spectrum of a studied sample can be unambiguously characterized by definition of three spectral luminescence parameters: 1) type of the spectrum (250-550 nm) reflecting the level and specificity of isomorphic contamination by the mineral of elements-impurities of transitional groups (super-pure, rate-earth-pure, moderately-rate-earth, rere-earth, anomalous-europium, rere earth-manganese, manganese); 2) variant of a dominating site of Feofilov's TR~(3+)-centres active in XEOL spectra; 3) HLn or LLn type of XEOL spectra corresponding to mineral formation in acid or alkali conditions, respectively. The paper also deals with particular qualities and mechanisms of XEOL spectra excitation in some of the fluorite TR-centres.