308 T. Z. Walker — Tungstite and Meymacite. 



Conclusion. — In British Columbia and possibly in the Black 

 Hills, S. D., a yellow crystalline mineral occurs having the 

 formula W0 3 .H„0. This appears to be the substance which 

 under various conditions has been called tungstite and mej'ina- 

 cite. It occurs along with gold and other tungsten minerals 

 and may be of industrial importance. The author suggests 

 that the name tungstite be used for this well established 

 hydrated oxide since the supposed anhydrous material had 

 never been analyzed. 



■ Mineralogical Laboratory, 



University of Toronto, January, 1908. 



