186 Mr. L. Fletcher's Cry stallographic Notes. 



(0 1 1) cleavage, (100): (11 1) cleavage ; and it is stated 

 that the occurring combinations are (111) (111), and 

 (1 11) (01 1) (1 1 1). Dana gives the following forms : — 

 (111) cleavage, (511) cleavage, (100) (111) cleavage, 

 (1 2 2) : perhaps 2R (5 11) is a misprint for - JR (0 1 1). 

 The mineral crystallizes from fusion in the form (1 0). 



In this collection crystals from Wittichen and Johanngeor- 

 genstadt presented one of the combinations mentioned by 

 Miller, namely (1 11) (11 1). 



To the list of observed forms must now be added the form 

 (13 3. A specimen from Siebenschlehn near Schneeberg, 

 in Saxony, shows crystals of bismuth associated with quartz. 

 Of two crystals, one presented the new form (1 3 3) in com- 

 bination with a largely developed (1 1 1) and a slight (10 0); 

 while the other presented the combination of (1 3 3) (11 1) 

 with slight (111), the latter face being probably due to 

 cleavage: the habit of the former crystal is seen in figure 8. 



First Crystal. 



Observed. Calculated. 



111.133 . . 21° 46': 21° 21': 22° 20' 21° 19' 



13 3.100 . . 106° 44': 105° 18' 106° 42' 



13 3.31 3 . . 82° 15': 82° 8': 81° 31' 83° 34' 



1 1 1 . 1 1 1 . . 109° 7': 110° 42' 110° 32' 



Second Crystal. 

 111.133 . . 21° 22' 21° 19' 



A third crystal from the same specimen presented the com- 

 bination (1 1 1) (1 0) (1 1 1), and a cleavage face (0 1 1). 



V. Sulphur. 



Forms already described as occurring on native sulphur: — 



(100) (010) (001) (110) (210) (310) (011) 



(013) (101) (203) (103) (111) (112) (113) 



(115) (119) (313) (315); and also (1 1 7) (311), 



(131) (4 3 4). 



In Dana's ' Mineralogy/ (014) is given in mistake for 

 (013), owing to a misprint in a paper of Hessenberg. The 

 last four forms were observed by Brezina* on some crystals 



* Berichte d. Akad. d. Wissensch. Wien, vol. lx. p. 539, 1869. 



