Mineral:  Alunite (potassium alunite) KAl3(SO4)2(OH)6

Sample No.: alunite.2

Source:  Hunt and Salisbury Collection #295 B (purchased from 
Ward's Natural Science Establishment).

XRD Analysis:  Pure alunite.

Chemistry:  XRF analysis by J. Foggert, Ardith Bartel, and K. Stewart, 
USGS Branch of Analytical Chemistry, Denver, showed this to be a 
potassium alunite:

SiO2 	0.17
Al2O3	35.60
FeTO3	0.14
MgO 	<0.10
CaO 	<0.02
Na2O 	0.34
K2O 	10.20
TiO2	<0.02
P2O5 	0.75
MnO 	<0.02
LOI  900¡ C	44.20
	_____
Total	91.56
