1096 General Notes. [ November, 
of sodium occurring in San Bernardino county, Cal. This min- 
eral was exhibited at the New Orleans exposition as thenardite, 
but was proven by both a crystallographic and optical examina- 
tion to crystallize in the hexagonal instead of the orthorhombic 
system. Chemical analysis by Messrs. Mackintosh and Penfield? 
indicate for the formula of this mineral: 4 (Na,SO,) + Na,CO,, 
with some admixture of potassium and sodium chlorides. The 
name was assigned in honor of Professor Henry G. Hanks, State 
mineralogist of California. 
Elpasolite is proposed by Messrs. Cross and Hillebrand? for a 
variety of cryolite in which about two-thirds of the sodium 1s 
replaced by potassium. Their analysis gives: 
Al Ca Mg K Na F Total 
11.32 072-042 28.93 9.90 46.98 98.08 
It was found in small cavities in the massive pachnolite occurring 
with other minerals of the cryolite group at El Paso county, 
Colorado. 
American Minerats.—The last published bulletin of the U. 5. 
Geology Survey (No. 20) entitled “Contributions to the Min- 
eralogy of the Rocky mountains,” by Messrs. C. W. Cross and 
localities. Chapter second deals with the minerals occurring a 
Pike’s Peak. These occur in veins and druses of a coarse Te 
of Science, Aug., 1885, p. 137. 
- Geol. Surv., No. 20, p. 57. 
