Mineral:  Riebeckite Na2(Fe+2,Mg)3Fe2+3Si8O22(OH)2

Sample No.:  riebeck.1

XRD Analysis:  Pure riebeckite.

Chemistry:  Microprobe analysis of hand-picked sample showed it to 
be homogeneous within and between grains, with typical riebeckite 
composition.  Average of 10 analyses:

SiO2	50.32
Al2O3	0.86
FeO	35.27
MgO	0.07
CaO	0.08
K2O	1.41
Na2O	7.95
TiO2	0.53
MnO	1.12
	_____
Total	*97.61
	*OH not measured.
