GEOLOGICAL SOCIETY. 



125 



SECOND CLASS, FIRST ORDER — PHYLLITE. 



Mono-axis. Perfect cleavage, which is only easy in 

 one direction. Not opaline. 

 H. from I to 4. 

 G. from 2, 1 to 4, 4. 



H. less than 2 and G. 2, 8 : with lateral cleav- 

 ages. Ex. Pharmacolite. 

 H. from 2 to 3 and G. from 2, 7 to 3 ; and they 

 are tetragonal, with cleavage through the 

 basis, as in chalcolite, and uranite : or rhom- 

 bohedral, with lateral cleavages, as in haid- 



H. more than 3 and G. 2, 6, and more. Ex. na- 



Color deep or dark green and blue, streak green and 

 blue : no distinct cleavage, in one direction only. 

 Not opaline. 

 Mono- axis. 



H. from 3 to 7. 



G. from 2, 7 to 4, 4. Ex. lenticular copper, Eu- 

 chroite, Br.; blue copper ore ; malachite, ata- 

 camite, olivenite, libesthenite, Br., phosphate of 

 copper, dioptase &c. 



ingerite. 



tive magnesia, sulphate of lime, hopeite, co- 

 balt bloom and vivianite, prismatic copper- 

 mica, Jam., diatomous habronem, Malachite, 

 Mohs &c. 



SECOND ORDER— CHALCITE. 



