Gemological Researches On Pink-purple Series Of FeiCui

Systemic gemological researches on pink-purple series of feicui have been carried out in this text. Physical properties, rock structures and constructions, mineral constituents, chemical compositions of minerals, crystalline structures, and essential factors of quality appraisal have been studied. A comprehensive summary to gemological characteristics of the pink-purple series of feicui is meaningful for clarifying some fuzzy understanding, and filling some blanks in the research. The conclusions are as follows:Physical properties of pink-purple series of feicui are similar to which of white and pale-green feicui. Their densities are from 3.27 to 3.34, refractive indexes are about 1.66, hardnesses of Mohs are from 6.5 to7.Through microscope observation and analyses of cathodoluminescence maps, formimg processions of feicui can be divided into static recrystallization, dynamic metamorphism and metasomatosis. Structures forming from dynamic metamorphism include mylonite structure, porphyroclasts structure and the structure of fragmentation. Common types of rock construction include stripped construction of pink feicui and taxitic construction of purple feicui.The mineral constituents of the pink-purple series of feicui are pure, by jadeite primarily; Electron probe analyses indicate that chemical composition of pink-purple series of jadeites are close to the theoretical values.Electron microprobe analyses and high temperature oxidation - reduction reactions indicate that color center results in pink color of feicui, yet trace element Mn makes feicui be purple.In the identification of enhanced and treated pink-purple series of feicui, besides traditional gemological methods, applications of large-scale instruments are valuable. The essential factors of quality appraisal are color, texture and volume.