BULL. GEOL. SOC. AM. 



VOL. 14, 1902. PL, 38 



FiGUEE 1.— WyOMINGITE OF ZiRKEL MeSA 



The round white minerals are leneite; the rods are diopside; the large dark ones are phlo- 

 gophite. Actual field, 1 millimeter. 



Figure 2.— Orendite from Fifteen-mile Spring, Zirkel Mesa 



Round white minerals are leucite ; the white rods sanidine ; the small dark rods diopsidt 

 the large dark mineral phlogophite. Actual field, 1 millimeter 



PHOTOMICROGRAPHS OF WYOMINGITE AND ORENDITE 



