Mineral:  Gypsum (selenite) CaSO4.2H2O

Sample No.: gypsum.2

XRD Analysis:  Pure gypsum.

Chemistry:  Volatile analysis by C. S. Papp, J. D. Sharkey, and K. J. 
Curry, and XRF analysis of the non-volatiles by J. Taggare, A. Bartel, 
and D. Diems, USGS Branch of Analytical Chemistry, Denver, showed a 
slightly low total but good gypsum composition:

SiO2 	<0.10
Al2O3 	<0.10
FeTO3	<0.04
MgO	<0.10
CaO	32.90
K2O 	<0.02
Na2O	<0.15
TiO2	<0.02
MnO 	<0.02
P2O5	<0.05
SO3	43.40
H2O	20.30
Other LOI	0.60
	_____
Total	97.80
