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PROCEEDING OF THE ACADEMY OF 



[Vol. LXXIV 



County. The mineral occurred in the form of white stalactitic 

 masses of cryptocrystalline to crystalline structure, and occasionally 

 in druses of very minute crystals. 



A single crystal measuring 3^8 by 3^ mm. was measured. The 

 results are given in Table III. The following combination of forms 

 was noted, fig. 2: b (010); m (110), B (10.7.0), N (210), f (520), 

 and y (122); of which B, N, f, and y are new. 



A crystal measured by Dr. Edgar T. Wherry 7 from this locality 

 showed the following forms: b (010), a (100), i (320), 1 (430), 

 m (110), n (340), p (101), and o (121). 



Table III. Wavellite Forms, Trimble's Mine, Pennsylvania 



New forms marked * 



Wavellite, Hellertown, Pennsylvania. 



As noted above, crystals from the Hellertown locality, Lehigh 

 County, were described by Wherry. As the material collected 

 by the writer at this mine were different in habit from those already 

 described, a single crystal, | X 1 mm. in size was therefore measured. 

 The results are given in Table IV. 



The following combination was found b (010), in (110), o (121), 

 and y (122). The dominant pyramid y (122) is a new form. 



Table IV. Wavellite Forms, Hellertown, Pennsylvania 



New form marked * 



7 Private communication. 



