426 PHYSIOGRAPHY. CLASS II. 



GENUS III. ANTIMONY. 

 1. HHOMBOHEDRAL ANTIMONY. 



Dodecahedral Antimony. JAM. Syst. Vol. III. p. 110. 

 Man. p. 250. Native Antimony. PHILL. p. 329. Ge- 

 diegep Antimon oder Spiesglas. WERN. Hoff'm. H. B. 

 IV. 1. S. 99. Gediegen-Spiessglanz. HAUSM. I. S. 125. 

 Gediegen Antimon. LEONII. S. 150. Antimoine natif. 

 HAUY. Traite, T. IV. p. 252. TabL comp. p. 112. 

 Traitd, 2de Ed. T. IV. p. 279. 



Fundamental form. Rhombohedron. R = 117 

 15'. Vol. I. Fig. 7. AP. 



a = V 1-273. 



Simple forms. R oo ; R ; R + 2 = 69 28' ; 

 P -f- oo. Combinations not observed. 



Cleavage, R oo highly perfect, and possessing a 

 strong lustre ; R distinct and easily obtained, 

 but shewing a less degree of lustre ; R -f- % dif- 

 ficultly obtained and interrupted ; faint traces of 

 P -f os. The result of all these cleavages is si- 

 milar to Fig. 127, only the faces o and z are 

 enlarged. Surface of R oo triangularly streak- 

 ed, R in a horizontal direction, and parallel also 

 to its own edges. Fracture not observable. 



Lustre metallic. Colour tin-white. Streak un- 

 changed. 



Rather brittle. Hardness = 3-0 ... 3-5. Sp. Gr. 

 = 6-646, the Swedish variety. 



Compound Varieties. Reniform : surface reni- 

 form or uneven ; composition of flat grains col- 

 lected into curved lamellae. Massive : composi- 

 tion granular of various sizes of individuals, easily 



