[Vibration spectra and genetic type of cassiterites].

Trace elements determination of cassiterites from Furong ore field indicates that there is a certain amount of Fe, Mn and Ti elements in cassiterite. The mean of unit-cell parameters for cassiterite is 7.165 (nm3) by the method of XRD analysis and the unit-cell parameter which also indicates that the genetic type of the ore field belongs to cassiterite-sulfide type, is bigger than that of other genetic type.

[Vibrational spectra of scheelite and its color genesis].

In order to study the spectral characteristics and color-genetic mechanism of the scheelite with orange color found in scheelite-tin-beryl (W-Sn-Be) deposits in Xuebaoding, four groups of scheelite were investigated by means of EMPA, IR, LRM and XRD. The scheelite samples were tested by XRD and IR in order to reveal if there are other minerals intermingled with scheelite. Meanwhile, the structure, the structure water and the crystal water were studied through infrared spectra.