oa 
on Utah, California and Nevada. 129 
panied by two analyses. A recent examination of this mineral 
—of the soft chalky variety—affords the following results. Its 
fuses to a white enamel. The spectroscope discloses from its 
solution in hydrochloric acid only the double spectrum of 
ric acid, with the lines of calcium and sodium. It contains 
no carbonate of lime, which might very naturally be looked 
d 
volumetric method only 0°7 c.c. of CO,, equivalent to ss35;5 of 
- 2. ra Mean. Oxygen ratio. 
Water 1829 | 18-29 18°29 18°29 18 
Lime, 32°38 31°37 31°73 31°83 1 
Na Cl. Fe Al 93 . OT ; 
Boric acid 48°50 49°34 50°01 49-00. 3-7 
_ The oxygen ratio gives approximately 4B, 30a, 6H; the lime 
1s a little too high. The probable formula of the mineral is 
Ca*B*6H, which makes the mineral to differ from hydroboracite 
by containing one-third less water and no magnesia. This 
tag requires: water 19-48, lime 30°21, boric aeid 50°36 
containing no magnesia and less water. It is certainly not a 
mechanical mixture, as its finely divided condition might seem 
to indicate. The microscope completely sustains the constant 
Tesults of analysis on this point. As it appears therefore to be 
Am. Jour. Sct.—Turrp Serres, Vou. VI, No. 32.—Aveust, 1873. 
; 9 
we 
