Mineral:  Richterite Na2Ca(Mg,Fe+2)5Si8O22(OH)2

Sample No.:  richter.1

XRD Analysis:  Richterite plus a trace of mica. (Infrared spectra do 
not, however, show a mica hydroxyl band.)

Chemistry:  Microprobe analysis showed the sample to be 
homogeneous within and between grains, with a composition typical 
of richterite.  Average of 9 analyses:

SiO2	54.87
Al2O3	1.97
FeO	2.40
MgO	22.92
CaO	9.09
K2O	1.48
Na2O	4.32
TiO2	0.39
MnO	0.20
	_____
Total	97.65
