PHYSIOGRAPHY. 



Calcedonite. 



113 



species by ESMARK; the grounds of this distinction however, are not 

 as yet made known. 



CALCEDONY. (See Quartz.) 



CALEDON1TE. Cupre-ous Le ad-Bary te . 

 Primary form. Right rhombic prism. M on M / = 95. 



Secondary form. 



Fig. 122. 



M on M' 



P on M or M 



P on <?2 



P on c 



P on el or el 7 



P on e2 or e2' 



Ponh 



Cleavage, parallel to M and T indistinct, but parallel to 

 h more obvious. Fracture uneven. Surface streaked. 



Lustre resinous. 



Color deep verdigris-green; inclining to mountain-green, 

 if the crystals are very delicate. Streak greenish-white. 

 Translucent. 



Rather brittle. Hardness =2-5 , 



. 3'0. Sp. gr.=6*4. 



1. Analysis. 

 By BROOKE. 

 Sulphate of lead . 



Carbonate of lead . 



Carbonate of copper . 

 10* 



55-8 

 32-8 

 11*4 



