CHARACTERS OF THE SPECIES. 



199 



Sp. Gravity. 



Various Observations. 



6-9.. .7-3. ? 

 4-4.. .4-7. 



3-0.. .3-3. 



BSITY 



2-5...2-6. 



(* 



2-25.. .2-3.) 



\ Opake, white ; lustre pearly or silky. 

 Surface of the crystals dull. 



2-5.. .2-6. 

 2-6...2-S. 



Dichroism parallel and perpendicular to the 

 prism. 



