Maw sit sit

Abstract: Mineralogical composition, texture and vibrational spectrum and origin of Mawsitsit jade from Burma are studied The testing methods of optical microscope, EPMA, Xray powder diffraction analysis, infrared absorption spectrum and Raman spectrum are employed in the research The results show that mineralogical composition of Mawsitsit jade mainly consists of chromejadeite[x(Kch)=15%～18%], chromian eckermannite[w(Cr2O3)=4% or so], albite, chromiferousalbite[w(Cr2O3)1% or so], kosmochlor[w(Kch)=62%～65%], chromite, etc The jade is formed by the dynamic metamorphism and metasomatism characterized by mylonitic, metasomatic network and metasomatic pseudomorphous textures The shape, the location and the semiheight breadth of Raman spectra of the chromejadeite and kosmochlor in the range 300～580 cm-1 are closely associated with the Cr3+ concentration, and at the same time are restrained by the bend vibration of Cr-O and Al-O The research indicates that Mawsitsit jade are formed by the superimposition and reformation of multistage dynamic metamorphism and lowtemperature hydrothermal metasomatism