484 klST OF MINERALS, THEIR 



Pearl-spar, see Lime, carbonate, magnesian. There has been 

 much uncertainty in the use of the terms Brown spar and 

 Pearl spar ; the first of these having been applied to 

 carbonate of Iron, and also to those varieties of Pearl 

 spar, or Magnesian carbonate of Lime, which are of a 

 brown colour, and probably to some other of the car- 

 bonates, of Lime, and of Manganese. 



PEARL STONE. 



Peat, see Coal. 



Pechuran, see Uranium, oxide, ferriferous. 



Peliome, see Dichroite. 



Pentaclasite, see Pyroxene. 



PERIDOT. 



crystallised ; Chrysolite A right rectangular prism , 

 M on a plane belonging to mod. class </, 141 30'. 

 granular; Qlivine. 

 , in a decomposing state ; Chusite. 



PETALITE ; Berzelite. Cleavage parallel to the planes of a 

 prism of 100 and 80, and to both its diagonals ; with 

 indications of a cleavage oblique to its axis. 



Petroleum, see Bitumen. 



Petro-silex, a name applied sometimes to compact Felspar, 

 and sometimes to a compact variety of Quartz. 



Petuntze, a Chinese name for one of the substances used in 

 the manufacture of their porcellain, which is probably 

 Quartz. 



jPharmacolite, see Lime, arseniate. 



Phengite, referred by Leonhard both to Anhydrite and 

 Topaz. 



Phosphorite, see Lime, phosphate, fibrous. 



Photizite, see Manganese, carbonate, siliceous. 



Physalite, see Topaz. 



Picotite, see Tourmaline. 



PICROLITE, a fibrous radiating substance found in the Ser- 

 pentine at Taberg in Sweden. 



Picrite, see Lime, carbonate, magnesian. 



Pictite, see Ttirnerite. 



Pimelite, see Nickel, oxide. 



PINITE. A regular hexagonal prism. 



A very soft substance from Pinistollen has passed 

 under the name of Pinite, but from analysis as well as 

 external character, it appears to be a separate species. 



Pisolite, see Lime, carbonate. 



Pistazite, see Epidote. 



Pitchblende, see ( T ranium, oxide, ferriferous. 



PITCHSTONE : Deodalite ; Pyraphroitte ; Retinitc. 



