O. Bowles — Crystal Forms of Pyromorphite. 115 



New South Wales. They are pale brown in color, of prismatic 

 habit, and are frequently doubly terminated. The prominent 

 forms areJIOlOJ, {lOll J, and ]0001[; while in many cases the 

 form {1120 \ is of equal importance. The bipyramid {2021£ 

 occurs frequently with narrow faces, while extremely small 

 faces of the form |1121' $ occur sparingly. 



A new form observed is the bipyramid of the third order 

 J 2131 J. A number of undoubted third-order faces were pres- 

 ent, but owing to curvature only a small number of these gave 

 reliable readings. For the most distinct face an average of 

 thirtj' readings at the point of maximum luster gave cf> 18° 58', 

 and p 66° 02'. 



Fig. 1. 



Fig. 



Figs. 1, 2. — Pyrouiorphite. 



The irregular moss-like aggregates from Phoenixville, Pa., 

 afforded rather unsatisfactory material for crystal study. Nar- 

 row faces, which are evidently third-order prisms, are present, 

 but are too indistinct to give readings from which symbols may 

 be determined. 



The most noteworthy feature of crystals from Devonshire, 

 England, is their peculiar habit, many of them being funnel- 

 shaped and attached at the smaller end. The broader termi- 

 nation shows usually a rim of basal pinacoid with a cavity in 

 the center. Occasionally the crystals are obliquely terminated 

 owing to the extreme development of one pyramidal face as 

 shown by a brightly reflecting border, the center being usually 



