﻿E. S. Dana — Mineralogical Notes. 



389 



and others. The recent observations of Einne (Jahrb. Min., 

 1884, ii, 164) appear to be highly accurate. He obtained as 

 the pyramidal angle 52° 21' and deduced as the vertical axis: 



c = 1-6219 



His observations upon etching-figures and other related points 



are also of much interest. 



The cabinet of Mr. Clarence S. Bement contains several 



specimens of the zincite from Stirling Hill, N. J., which show- 

 distinct crystals. In two of these the 

 acute quartzoid characteristic of the spe- 

 cies is seen in hemimorphic development 

 with the prism and basal plane at one 

 extremity. Other specimens show the 

 same form larger (up to two inches in 

 length) in outline imbedded in the gangue. 

 The accompanying figure gives the habit 

 of the crystals, and the following angles, 

 though making no claim to accuracy, 

 show a fair agreement with the angles 



of the artificial forms. 



Measured. 

 pp' = 53° 43' 

 p'p" = 54° 2' 

 cp = 65° 20' appro-x 



Calculated. 

 52° 21' Bione. 

 61° 54' 



4. Sulphur. 



A. specimen of native sulphur from Eabbit Hollow, Nevada, 

 in the cabinet of Professor Brush, is interesting because of the 

 complexity of the form. The mass is 

 crystalline throughout, the parts 

 mostly in parallel position, though 

 distinct isolated crystals are rare. 

 One of these was detached and meas- 

 ured ; it is shown in the figure in ba- 

 sal projection. The planes are : 



c (001, o\ u (103, f % e (101, 14), 

 v (013, f*), n (011, 1-t), <fi (119, I), 

 « (118, i), <(115, i), o(114, i), 5 (113, i), 

 y (112, i), p (111, 1), p (315, |-3), 

 z (135, f§), x (133, l-§). Of these /? 

 and o are new; ft was determined by the zones p, s ! " (m, 113) 

 and y, x (112, 133) ; also lies in the zone c, p (001, 111). 



The calculated angles of these forms (accepting the axes of 

 Kokscharow) are : 



Calculated. Measured. 

 00" = 315 a 315 = 24° 54' co = 001 a 114 = 37° 2 f 37° 1' 



