PHYSIOGRAPHY. 



Picrosmine. 



105 



The thin seams of Asbestus, so called, in the Serpentine of Newbury- 

 port, (Mass.) Newport, (R. I.) and numerous other places in New Eng- 

 land, probably belong to this species. 



PICNITE. (See Topaz.) 

 PICROPHARMACOLITE. (See Pharmctcolite.) 

 PICROSMINE. Prismatoidal Atelene Pic- 

 rosmine. 



Primary form. Right rectangular prism : from cleavage. 

 Cleavage, affords the form in the annexed figure. 



Fig. 337. 



M 



t on i 

 s on s 



117 49' 

 126 52 



Parallel to M, the cleavage is perfect ; parallel to T less 

 D, and least of all, to i. 



Fracture uneven, scarcely perceptible.. 



Lustre pearly, distinct upon M, inclining to vitreous upon 

 the others. Color greenish-white, passing into greenish- 

 grey and mountain-green, sometimes also oil-green, leek- 

 green, and blackish green. Streak white, dull. Translu- 

 cent on the edges. 



