AM_Dravite
Formula:
Na Mg3 B3 Al6 Si6 (O31 H4)
Name:
Dravite
Unit cell:
15.951 15.951 7.24 90.0 90.0 120.0 , V=1595.31
Space group:
R3M (160)
Hamburger G E , Buerger M J , American Mineralogist , 33 (1948) p.532-540, The structure of tourmaline