Table 7. Saturation indexes for selected minerals and the partial pressure of carbon dioxide gas calculated from dissolved chemistry in water from Cave Springs prior to and after reconstruction of water-collection system and from Marmot Spring, Great Basin National Park, Nevada.

[Site locations are shown in figure 2. Concentration of dissolved oxygen was used for the Redox state. Saturation index: A measure of disequilibrium expressed as the log of the ratio of the ion activity product (IAP) divided by the solubility product at the measured water temperature (K_t). A value of zero means the water is in equilibrium with a particular mineral. A value less than zero means the water is undersaturated with respect to a particular mineral and a value greater than zero means the water is oversaturated with respect to a particular mineral]

Mineral			Saturation index
Name	Cations		Site 1 Cave Springs July 1987	Site 1 Cave Springs September 2007	Site 4 Marmot Spring September 2007
Carbonate minerals
Calcite	Calcium		-1.70	-1.11	-2.96
Dolomite	Calcium, magnesium		-3.90	-3.00	-6.41
Siderite	Iron		-11.34	-9.72	-12.20
Rhodochrosite	Manganese		-3.31	-0.82	-4.53
Strontianite	Strontium		-3.50	-2.94	-4.80
Partial pressure of carbon dioxide (gas)	–		-2.32	-1.83	-1.21
Sulfate minerals
Gypsum	Calcium	-3.58	-3.29	-3.48
Celesite	Strontium	-4.22	-3.95	-4.16
Fluoride mineral
Fluorite	Calcium	-3.30	-2.84	-3.61
Silicate minerals
Quartz	–	0.63	0.57	0.57
Potassium feldspar	Potassium, aluminum	-0.86	-1.48	-4.07
Albite	Sodium, aluminum	-2.53	-3.15	-5.61
Anorthite	Calcium, aluminum	-5.05	-5.54	-11.03
Potassium mica	Potassium, aluminum, magnesium, iron	6.77	5.50	0.07
Clay minerals
Illite	Aluminum	0.97	-0.08	-4.61
Kaolinite	Aluminum	4.12	3.34	0.51
Hydroxide minerals
Gibbsite	Aluminum	1.05	0.72	-0.70
Manganite	Manganese	2.58	4.23	0.26
Oxide minerals
Goethite	Iron, hydrogen	7.26	8.15	5.29