ORDER II. PYRAMIDAL SCHEELIUM-BARYTE. IIS 



France, in various counties of England, enumerated in 

 the preceding species. A reniform variety of a fine yellow 

 colour has lately been found in Cumberland. 



5. Both the species of the genus Zinc-baryte are use- 

 fully employed in extracting zinc ; and also in the produc- 

 tion of brass. 



GENUS III. SCHEELIUM-BARYTE. 

 1. PYRAMIDAL SCHEELIUM-BARYTE. 



Pyramidal Tungsten. JAM. Syst. Vol. II. p. 432. Man. 

 p. 68. Tungsten. Tungstate of Lime. PHILL. p. 256. 

 Schwerstein. WERV. Hoffm. H. B. IV. 1. S. 236. 

 Schwerstein. HAUSM. III. S. 967. Scheelit. LEONH. 

 S. 594. Sche'elin calcaire. HAUY. Traite', T. IV. p. 320. 

 TabL comp. p. 118. Traite', 2de Ed. T. IV. p. 372. 

 BOURNON. Journ. des Mines. Vol. XIII. p. 161. 



Fundamental form. Scalene four-sided pyramid. 

 P = 107 27, 113 35'. Vol. I. Fig. 8. HAUY. 



a = V 2 ' 3333 - 



Simple forms. P oo ; -^ P 5 = 1 57 33', 

 31 58' ; | P 2 = 147 25', 46 45' BOURN.; 

 -^P 2 = 131 11', 71 4' PHILL. ; P 2 

 = 1 29 KX, 74 45' PHILL. ; | P 2 = 125 7', 

 81 21'; f P = 122 55', 85 1' BOURN. ; P 1 

 = 117 29', 94 25' ; P (g), Zinnwald, Saxony ; 

 P + 1 (P) = 100 8', 130 2(X * ; ( 2J P P 2) 5 

 (a) = 164 25', inclination upon P ; (* 2 P 4) 6 

 172 3', inclination upon P ; (P + I) 3 (6). 



Char, of Comb. Henri. pyramidal with parallel faces. 



* This angle is given = 129 2' by Mr BROOKE, = 128 40' 

 by Mr PHILLIPS. H. 



VOL. II. H 



