OPTICAL CHARACTERS OF MINERALS. 107 



are, White, Grey, Black, Blue, Green, Yellow, Red, and Brown. 

 Each of these comprehends several varieties, the names of which 

 are either derived from such bodies as they most frequently occur 

 in, or they are formed by composition. Examples of the first are, 

 rose-red, apple-green, &c. ; of the latter, reddish-brown, yellowish- 

 brown, &c. 



. 91. METALLIC COLORS. 



The metallic colors are, 1. Copper-red; 2. Bronze-yel- 

 low-; 3. Brass-yellow, and 4. Gold-yellow; 5. Silver-white, 

 and 6. Tin-white ; 7. Lead-grey, and 8. Steel-grey, and 

 9. Iron-black. 



1. Copper-red, the color of metallic copper. JT. Native Copper. 



2. Bronze-yellow, the color of several metallic alloys, as Bronze 

 and Speise. Ex. Magnetic Iron Pyrites. 



3. Brass-yellow, the color of brass. Ex. Copper Pyrites. 



4. Gold-yellow, the color of pure gold. Ex. Native Gold. 



5. Silver-white, the color of pure silver. Ex. Native Silver. 



6. Tin-white, the color of pure tin. Ex. Native Antimony and 

 Native Mercury. 



7. Lead-grey, the color of metallic lead. Ex. Galena, and Sul- 

 phuret of Molybdena. 



8. Steel-grey, approaching the color of recently fractured steel. 

 . Ex. Native Platina, and Graphic Tellurium. 



9. Iron-black, nearly the color of cast-iron. Ex. Octahedral 

 Iron Ore. 



. 92. NON-METALLIC COLORS. 



The non-metallic colors are considered in the order in 

 which the fundamental colors have been enumerated in . 90. 



The following are the non-metallic colors. 

 (A.) White. 



1. Snow- White. The purest white color. Ex. Carrara Marble 

 and Flos-ferri. 



2. Reddish-white. White with a tinge of red. Ex. Some vari- 

 eties of Calcareous Spar and of Quartz. 



