SCHALLER.] 
MINERALOGICAL NOTES. 
123 
The mineral from Campo Seeo occurs massive, showing no crystal- 
line structure. The average of several determinations afforded the 
results shown below. 
Ratio. 
26.13 
LOO 
.81 
. 03 
.64 
.05 
27.25 
1 . 04 
CuO. 
Fe< ) . 
MgO 
S0 3 . 
H,0 ( 110° ) 36. 70 ^ 
H 2 (above 110°) 
lasol 
4.01 
41.67 
3. 96 
100.46 
6.21 
84/' 
06 
Formula, CuS0 4 .H 2 0+6H 2 6. 
A careful determination of the specific gravity of the mineral gave 
(21 C.) 1.944. This being much lower than the value obtained (2.1) 
on the boothite from Leona Heights, a redetermination of the latter 
was made on purer material collected since the publication of the first 
results." This gave as an average, value the figure (22° C.) 1.935. 
The average of these two determinations, or 1.94, is probably very 
near the true value for the specific gravity of boothite. 
4. PISANITE. 
A small specimen of massive pisanite from Gonzales, Monterey 
County, Cal., was analyzed some time ago and the results are here 
presented. The quantity of material available for analysis was very 
small and the determinations do not claim any great accuracy. About 
6 per cent of insoluble matter has been deducted and the results recal- 
culated to 100 per cent. 
Ratio. 
Cu< ) 
7.56 
15. 85 
30. 74 
45. 85 
0.27^ 
M). 89 
.72/ 
Fe( ) '..... 
S< ), 
1 08 
H 2 
7. 18 
100.00 
The 
anatysis 
approximates to the formula Cu0.2Fe0.3S( 
) sr 21H 2 0. 
nSchaller, W. T., Minerals from Leona Heights, Alameda County, Cal.: Bull. Dept. Geol. Univ. 
Cal., vol. 3, No. 7. 
