PICROSMIXE. 137 



green passing into yellow. Streak a little shin- 

 ing. Translucent on the edges. 

 Hardness between 3-0 and 6-0. 



According to ALMROTH, it consists of 



Silica 40-04. 



Magnesia 38-80. 



Water 9-08. 



Protoxide of Iron 8-28. 



Carbonic Acid 4 -JO. 



It colours glass of borax green, but the colour disappears 

 on cooling. It occurs in irregular veins in the beds of oc- 

 tahedral Iron-ore in the Taberg, and at Nordmarken in 

 Sweden, and has been mentioned also from Reichenstein 

 in Silesia. 



PICROSMINE.* 

 > Picrosmin. HAIDINGER. 



Fundamental form. Scalene four-sided pyramid. 

 P = 151 3', 120 (X, 67 59'. Vol. I. Fig. 9. AP. 



a : b : c = 1 : ^11-00 : V 2 *? 5 - 



Simple forms and combinations not known ; the 

 character of the latter prismatic, as it appears 

 from cleavage. 



Cleavage. r + oo (M) perfect; Pr -f OD (T) 

 less, Pr (i) = 117 49' still less distinct. Least 

 of all P + oo (s) = 126 52'. The product of 

 all the faces of cleavage is represented by Fig. 25. 

 excepting the faces o. 



Fracture uneven, scarcely perceptible. 



* Name derived from xtxfa, bitter, and l<rp/r t , odour, from 

 the bitter and argillaceous odour the mineral exhales when 

 humected. 



