342 Van Name — Crystals of Crocoitefrom Tasmania. 



shows a more highly modified crystal which has the prisms 

 ra(110), d (210) and jf (120), the pinacoid a (100), the pyramid 

 t (111), the base c (001), and the orthodomes k (101) and x (301). 



This type of crystallization is shown by two of the specimens 

 in the Brush collection, both of which consist of an aggregate 

 of small, rather loosely intergrown crystals. A little of the 

 limonite gangue is attached to each of them, and as far as can 

 be judged the occurrence of the crystals of this type is the 

 same as that of the slender prismatic crystals, although in no 

 case were individuals of both types observed upon the same 

 specimen. 



A list of all the forms observed is given below. It should 

 be noted that no attempt was made to identify any but the 

 most prominent prismatic forms, on account of the tendency 

 to striation which seems almost invariably to accompany any 

 modification of the unit prism. 



a, 100 



c, 001 



t, 111 



z, 011 



m, 110 



7c, 101 



v, 111 



w, 012 



d, 210 



x, 30 L 





y, 021 



/, 120 







*j, 032 



These Tasmanian crystals of crocoite with their superb color, 

 high luster and remarkably perfect crystallization, are most 

 beautiful natural objects, scarcely surpassed by crystals of any 

 other known mineral. 



The generous advice and assistance of Prof. S. L. Penfield, 

 which has been constantly given during the preparation of this 

 paper, is gratefully acknowledged by the author. 



Sheffield Laboratory of Mineralogy, 

 Yale University, New Haven, Conn., February, 1902. 



