120 PHYSIOGRAPHY. 



LEVYNE. 

 KOUPHONE-SPAR. 



Levyne. Dr BEEWSTEH. Edinb. Journ. of Science. Vol. 

 II. p. 332. 



Rhombohedral. R = 79 29'. Vol. I. Fig. 7. AP. 

 a = V 8-3. 



Simple forms. R o> (o) ; R 1 (g) = 106 4' ; 

 R(P); |R+ 1 (ra) = 70 7'. 



Char, of Comb. Rhombohedral. 



Combination. R oo. R 1. R. Fig. 194. 

 represents two individuals compound parallel to 

 R oo, the individuals continued beyond the 

 face of composition, as in rhombohedral Kou- 

 phone-spar. Inclination of o on g = 136 1', 

 of o on P = 117 24', of o on n = 109 13'. 



Cleavage, indistinct, parallel to R. Fracture im- 

 perfect conchoidal. Surface, R 1 and R 

 streaked parallel to their common edges of in- 

 tersection. R oo uneven, and generally curved, 

 so that the opposite faces are often inclined on 

 each other at an angle of 2 3. 



Lustre vitreous. Colour white. Streak white. 

 Semi-transparent. 



Brittle. Hardness = 4-0. 



Levyne was first observed by Mr HEULAND, and sus- 

 pected to be a new mineral. Dr BREWSTEH afterwards 

 subjected it to an optical examination, and gave to it the 

 name of Levyne, in honour of Mr LEVY, who had first 

 examined its crystallographic properties. 



In the glass tube it gives off a considerable quantity of 

 water, and becomes opake. Upon charcoal it intumesces a 

 little. With salt of phosphorus it yields a transparent 



