SYNONYME3, AND PRIMARY FORMS. 485 



Pittizite, sec Iron, sub-sulphate. 

 Plasma, see Quartz, calcedony. 

 PLATINA, native. 



alloyed with other metals. 



black, containing a larger quantity of the 



ore of Iridium than the common Platina does. 

 Pleonaste, see Spinelle. 

 Plombagine, see Graphite. 



Plomb-gomm, see Lead, oxide, hydro-aluminous. 

 Plumbago, see Graphite. 

 Polishing slate, see Quartz, earthy. 

 Polychrome, see Lead, phosphate. 



POLYHALLITE. 



Porcellain Jasper, see Quartz, Jasper. 



POTASH ; Kali. 



nitrate; Nitre, 

 fibrous. 



Potstone, see Talc, compact. 



Pounxa, see Soda, borate. 



Prase, see Quartz. 



PREHNITE. 



crystallised. A right rhombic prism, M on M', 100*. 

 the crystals tabular and very thin ; Kocepholite. 

 fibrous, 

 compact. 



PUMICE; Bimstein. 



Pycnite, see Topaz. 



PYRALLOLITE, from a small fragment with which I have 

 been favored by M. Nordenskiold, its discoverer, I find 

 that there are cleavages parallel to the lateral planes and 

 to the diagonals of a rhombic prism. But the planes are 

 too imperfect to determine the angles of the prism. 



Pyraphrolite, see Pitchstone. 



Pyrenaite, see Garnet, black* 



Pyrgom, see Pyroxene. 



Pyrites, see Iron, sulphuret ; and Copper, sulphuret. 



PYRODMALITE; Pyromalite. A regular hexagonal prism. 



Pyromorphite, see Lead, phosphate. 



Pyrope, see Garnet. 



Pyrophysalite, see Topaz. 



PYRORTHITE. 



Pyrosiderite, see Iron, oxide, hydrous. 



Pyrosmalite, see Pyrodmalite. 



PYROXENE. 



crystallised ; Alalite ; Augite ; Baikalite ; Diopside ; 

 Fassaite; Malacolite; Mussite ; Peutaclasite ; 



