OPTICAL CHARACTERS OF MINERALS. 109 



8. Indigo-blue. Blue mixed with black and green ; the color of 

 Indigo. Ex. Blue Iron Earth. 



9. Duck-blue. Blue largely mixed with green and a little black. 

 Ex. Talc. 



10. Sky-blue. A pale blue color, with a little green; the color 

 of the clear sky. Ex. Fluor. 



(E.) Green. 



1. Verdigris- green. A green color, inclining to blue ; the color 

 of verdigris. Ex. Green Feldspar. 



2. Celandine- green. A green color mixed with blue and grey. 

 Ex. Beryl 



3. Mountain- green. Green with much blue. Ex. Aqua-marine. 



4. Leek-green. The color of the leaves of garlick. Ex. Prase. 



5. Enter aid- green. The purest green color. Ex. Emerald. 



6. Jlpple- green. A light green color with a shade of yellow. Ex. 

 Chrysoprase. 



7. Grass-green. The lively color of grass in the spring; green 

 mixed with much yellow. Ex. Green Diallage, Actynolite, &c. 



8. Pistachio- green. Green with yellow and brown. Ex. Chry- 

 solite and Epidote. 



9. Asparagus-green. Pale green, with much yellow. Ex. As- 

 paragus stone. 



10. Blackish- green. Green with black. Ex. Serpentine. 



11. Olive-green. Pale green, with much brown and yellow, 

 Ex. Pitchstone. 



12. Oil-green. A green color still lighter, with more of yellow, 

 and less of brown ; the color of olive oil. Ex. Blende. 



13. Siskin-green. A light green color, very much inclining to 

 yellow. Ex. Uranite. 



(F.) Yellow. 



1. Sulphur-yellow. The color of pure sulphur. Ex. Native 

 Sulphur. 



2. Straw-yellow. Light yellow; nearly the color of straw. Ex. 

 Karpholite. 



3. Wax-yellow. Yellow with grey and a little brown ; the color 

 of yellow wax. Ex. Common Opal. 



4. Honey-yellow. Yellow with a little red and brown ; the dark 

 color of honey. Ex. Fluor. 



5. Lemon-yellow. The purest yellow color ; the color of ripe 

 lemons. Ex. Yellow Orpiment. 



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