Tourmaline Tourmaline Price

Kai Tai tourmaline mineral processing plant normally produced in the rare metal pegmatite type, albite, lepidolite, greisen containing gemstone. Tourmaline often with ribbon phenomenon, streak colorless, vitreous luster, no cleavage. Hardness 7.0-7.5. With brittleness. The proportion of 3.03-3.25. With piezoelectric and pyroelectric properties. Under UV light, no fluorescence to send a weak fluorescence, such as those made weak purple red fluorescence. Transmitted light microscope with pleochroism. Physical properties: color varies with composition: Fe-rich tourmaline and black, rich Li, Mn and Cs were pink tourmaline, also pale blue, Mg-rich tourmaline often has brown and yellow , Cr-rich dark green tourmaline. In addition, tourmaline often has ribbon phenomenon, vertical c-axis from the center out to form a horizontal ribbon, or a different color c-axis  ends. Shiny glass. No cleavage; sometimes there is a split vertical L3. Hardness of 7 to 7.5. The relative density of 3.03 ~ 3.25, with the composition Fe, increase the relative density of the Mn content also increases. Not only it has the piezoelectricity, and also has pyroelectric properties (because it is the only way the polar axis L3). 