154 EEPORT UNITED STATES GEOLOGICAL SURVEY. 



Zircon has also been found in quartz in El Paso County. An analy- 

 sis furnished Dr. Koenig the following result:* 



Per cent. 



SiOi 29.70 



ZrOa i 60.98 



Fe^Os 9.20 



MgO 0.30 



100. 18 



ZiNKENiTE. — Sweet Home Mine, small crystals. 

 ZiPPEiTE. — Wood lode, Leavenworth Gulch, near Nevada. 



*Ibicl., Part I, 1877, p. 9. 



