TERMINOLOGY. . 201. 



Augite-spar, called Zoisite, and trapezoidal Kouphone- 

 spar. 



C. Black. 



1. Greyish-black. Black mixed with grey (without any 

 green, brown, or blue tints). Ex. Basalt ; Lydian-stone, 

 Avhich is an impure variety of rhombohedral Quartz ; An- 

 thrakolite, an impure variety of rhombohedral Lime-haloide. 



2. Velvet-black. The purest black colour. It is the co- 

 lour of black velvet. Ex. Empyrodox Quartz, called Ob- 

 sidian ; rhombohedral Tourmaline, called Schorl. 



3. Greenish-black. Black mixed with green. A very 

 common colour in several species of the genus Augite-spar. 



4. Brownish.black. Black mixed with brown. Ex. Se- 

 veral varieties of rhombohedral Talc-mica; bituminous 

 Mineral-coal. 



5. Blueish-black. Black mixed with blue. It is a rare 

 colour, and scarce ever found except in the botryoidal and 

 reniform varieties of Black Cobalt from Saalfeld in Thu- 

 ringen. 



D. Blue. 



\.Blackish-blue. Blue mixed with black. Ex. The dark 

 coloured varieties of prismatic Azure-malachite. 



2. Azure-blue. A very bright blue colour, mixed with a 

 little red. Ex. The pale varieties of prismatic Azure-ma- 

 lachite, and the bright varieties of Lapis lazuli. 



3. Violet-blue. Blue mixed with red. Ex. .Rhombohe- 

 dral Quartz (Amethyste), and octahedral Fluor-haloide. 



4. Lavender-blue. Blue with a little red, and a great deal 

 of grey. Ex. JLithomarge, and some varieties of Porcelain 

 Jasper. 



5. Plum-blue. A colour inclining somewhat to brown, 

 and very difficult to describe. It is something like the co- 

 lour of certain varieties of plums. It is very rare, and oc- 

 curs only in a few varieties of dodecahedral Corundum, and 

 of octahedral Fluor-haloide. 



6. Prussian-blue, or Berlin-blue. The purest blue colour. 



