214 



J. II. Pratt — Mmeralogical Notes. 



The crystals from the first mentioned locality are terminated 

 by brachy- and macro-domes as represented in fig. 3. No 

 doubly terminated ones were observed, all being attached upon 

 the pyramidal or antilogous end. The prism faces are more or 

 less striated but not so greatly but that sufficiently accurate 

 measurements could be obtained to identify them. The domes 



were bright and smooth and gave very good reflections of the 

 signal. The faces observed on these crystals are as follows : 



h (010, i-i) 

 m (110, /) 



s (101, 1-7) 

 t (301, 3-i) 



e (oil, 1-2) 

 i (031, 34) 



The crystals from Clear Creek Co., Colorado, as shown by 

 specimens in the Brush collection occur in cavities in hematite. 

 They are similar to those from Sterling Hill but have in addi- 

 tion the macro-pinacoid a (100, i-l), while e (Oil, 14) is want- 

 ing. These crystals which are represented by fig. 4 are so 

 greatly striated that no measurements could be made in the 

 prism zone. 



The following table gives the calculated and measured angles. 

 For obtaining the calculated ones the elements of Schrauf* 

 have been used in which 



a /s s, 100/slOl 

 « A *, 100/^301 

 b /v i, 010^031 

 i ^ i, 031^031 

 e x e, 011^011 

 m./^m, 110/sllO 



a:b:6 = 0-78340: 1 

 Calculated. 

 58° 37' 

 28 39 30" 

 34 54 

 110 12 

 51 5 

 76 9 



0-47782. 



Measured, 

 58° 40', 58° 40' 

 28 38 30", 28° 35' 

 34 51 

 110 11 30 

 51 11 

 76 36 



Prof. F. D. Adamsf has 



Zircon. — In a recent paper 

 described the occurrence of a large area of nephelite syenite 

 from the townships of Dungannon and Faraday, Ontario, and 



* Daua's Mineralogy, sixth edition, page 546. 

 fThis Journal, vol. xliii, p. 10, 1894. 



