Mineral:  Tourmaline (Schorl) NaFe3+2Al6(BO3)3Si6O18(OH)4

Sample No.:  tourmal.2

XRD Analysis:  Pure tourmaline.

Chemistry:  Microprobe analysis showed that the sample was 
homogeneous between and within grains.  An average of 10 analyses 
lacks information on boron and water but shows sufficient iron 
present to confirm schorl composition:

SiO2	35.11
Al2O3	34.52
FeO	11.98
MgO	1.02
CaO	0.07
K2O	0.04
Na2O	1.38
TiO2	0.05
MnO	0.27
	_____
Total	*84.44
	*Li, B, and OH not measured.
