PALACHE. 



CRYSTALLOGRAPHY OF LEADHILLITE. 



439 



TABLE II. 

 Utah Leadhillite. 



generally present as face or cleavage, truncates the summit of the 

 pseudo-rhomhohedron with entire symmetry. As before stated, most 

 of the crystals measured were but fragments, and the table of combina- 

 tions does not therefore give an entirely correct idea of the relative 

 frequency of occurrence of the various forms. 



The forms c, a, m, u, and r are present on nearly every crystal. Of 



