“Analytical data for the Dravite from Pyan Gyi mine.
We can see, that mineral contain only traces of vanadium (below analytical error limit, but its peaks on the spectrum still is visible) and completely Cr-free.
Besides that, Ca content in it is very subordinate, so Na is absolutely predominate in A site of the tourmaline, i.e. it is Dravite. And this dravite is completely magnesial Fe-free. Specimen was obtained from Sieghard Ellenberger (Crystal-Treasure). Pavel M. Kartashov analytical data, collection and photo.”
Pavel Kartashov - 8th January 2011