4 PHYSIOGUAPHY. CLASS n. 



ticai planes deeply striated parallel to their own 

 intersections, and rough. The pyramids in a 

 parallel position with P are sometimes irregularly 

 streaked in a horizontal direction, but generally 

 smooth, as also the other inclined faces. Subject 

 to tarnish. 

 Lustre metallic. Colour lead-grey, inclining to 



steel-grey. Streak unchanged. 

 Sectile. Thin laminae are a little flexible parallel 

 to the intersection of Pr -f- o> with P QD. Crys- 

 tals sometimes bent. Hardness = 2-0. Sp. Gr. 

 := 4-620 the cleavable variety from Anhalt. 

 Compound Varieties. Massive : composition co- 

 lumnar, of various sizes of individuals, sometimes 

 very thin, but not impalpable. They are long and 

 straight, either parallel or divergent from several 

 common centres, and aggregated in a second angulo- 

 granular composition. The faces of composition 

 are irregularly streaked in a longitudinal direction. 

 Sometimes the composition is granular, and then 

 the individuals often become impalpable, but are 

 generally very strongly connected ; the fracture be- 

 comes even or uneven. Capillary crystals often 

 form a tissue resembling wool or felt. 



OBSERVATIONS. 



1. The present species has been divided into Common and 

 Plumose Grey Antimony ^ differing chiefly in the size of their 

 individuals. The latter consists of capillary crystals, which 

 are sometimes even flexible, and either implanted in 

 groupes, or interlaced with each other ; sometimes also they 

 form massive varieties in which the columnar composition 



