28 * TERMINOLOGY. . 201. 



5. Silver-white, the colour of pure silver. Distinct in 

 hexahedral Silver ; less distinct in prismatic Arsenical-py- 

 rites ; inclining to red in hexahedral Cobalt-pyrites. 



C. Tin-white, the colour of pure tin, particularly not 

 mixed with lead. Ex. Fluid Mercury ; rhombohedral 

 Antimony, and also native Arsenic, in this, however, inclin- 

 ing a little to lead-grey. 



7. Lead-grey, the colour of metallic lead. Of this colour 

 three different shades have been distinguished. 



a, Whitish lead-grey ; b, pure lead-grey ; and c, blackish 

 lead-grey. Whitish lead-grey is found in the compact 

 varieties of hexahedral Lead-glance ; pure lead-grey in 

 the common varieties of the same species, which consist 

 of larger individuals than the former, also in rhombohe- 

 dral Molybdena-glance, &c. ; blackish lead-grey in hexa- 

 hedral Silver-glance, in prismatic Copper-glance, &c. 



8. Steel-grey, nearly the colour of fine grained steel 

 upon a recent fracture. Ex. Native Platina and prismatic 

 Antimony-glance. 



9. Iron Had; nearly the colour of highly carboniferous 

 east iron. Ex. Octahedral Iron-ore ; less distinct rhombo- 

 hedral Iron -ore, and tetrahedral Copper-glance. 



. 201. NON-METALLIC COLOURS. 



The non-metallic colours are considered in the 

 consecutive order of the principal kinds (. 199.), 

 which represent the general series of colours. 



The following are the non-metallic colours : 



A. White. 



1. Snow-white. The purest white colour. Nearly the 

 colour of newly fallen snow. Ex. llhombohedral Lime- 

 haloide (Carrara marble), prismatic Lime-haloide (Flosferri). 



2. Reddish-white. White (though not always of the purest 

 tint) inclining somewhat to red. Ex. Several varieties of 

 rhombohedral and macrotypous Lime-haloide, of rhombo- 

 hedral Quartz, &c. 



