152 PHYSIOGRAPHY. CLASS n. 



Man. p. 113. White Antimony. Oxide of Antimony. 

 PHILL. p. 331. Weisspiesglaserz. WERN. Hoff'm. 

 H. B. IV. 1. S. 119. Spiessglanzweiss. HAUSM. I. S. 

 341. Antimonbliithe. LEONH. S. 160. Antimoine 

 oxide'. HAUY. Traite, T, IV. p. 273. Tabl. comp. p. 

 113. Traite, 2de Ed. T. IV. p. 308. 



Fundamental form. Scalene four-sided pyramid. 

 P = 105 38', 79 44', 155 IT. Vol. I. Fig. 9. 



a : b : c = 10 : J12-5 : x/7'77- 



Simple forms. P (P) ; (Pr + cc) 3 (M) = 136 58', 

 R. G. ; Pr 1 (p) = 70 32', AP. Pr + oo. 



Char, of Comb. Prismatic. 



Combinations. 1. Pr 1 . (Pr + oo) 3 . Pr+oo. 



Sim. Fig. 9. Braunsdorf, Saxony. 

 2. Pr 1. P. (Pr+oo) 3 . Pr + oo. Fig. 14. 

 Braunsdorf. 



Cleavage. (Pr -|- oo) 3 highly perfect, and easily 

 obtained. Scarcely traces parallel to Pr -f oo. 

 Fracture not observable. Surface Pr 1 and 

 P curved ; Pr -|- oo smooth and even ; (Pr -{- oo) 3 

 very even, though sometimes a little rough. 



Lustre adamantine, particularly upon the curved 

 faces, upon Pr -f- oo often pearly lustre. Co- 

 lour white prevalent, passing into peach-blossom- 

 red and ash-grey. Streak white. Semi-trans- 

 parent ... translucent. 



Sectile. Hardness = 2-5 . . . 3-0. Sp. Gr. = 5-566, 

 the simple crystals from Braunsdorf. 



Compound Varieties. Crystals, compressed be- 

 tween Pr -f GO, are joined parallel to this face. If 

 the individuals be very thin, the common varieties 

 of this species are formed, which used to be consi- 



