PHYSIOGRAPHY. 



Oxygen. 



2. Analysis. 



By KOBELL. 



Silica - - * - - - - - 51-30 



Lime 33-77 



Soda 8-26 



Potash 1-57 



Water _.----- 8-89 



Alumina and oxide of iron .... 0-90 

 3. It occurs on Natrolite, a variety of Mesotype, at Monte Baldo in 

 South Tyrol. 



PEGAMITE. 



Primary form. Right rhombic prism. M on M = 127 . . . 128. 



Secondary form. Primary form, having the acute lateral edges, 

 and the acute terminal angles, truncated. 



Cleavage, parallel with P, but difficult; also parallel with the 

 shorter diagonal of the prism. Fracture conchoidal. 



Lustre vitreous. Color green, pistachio, leek, apple or grass : 

 also, pale mountain green, greenish grey, and greenish white. 

 Streak white. Transparent or translucent. 



Brittle. Hardness (scale of BHEITHAUPT) =5-25 . . . 5-50. Sp. 

 gr. = 2-492 ... 2 496. 



1. Before the blowpipe, in the tube, it gives much water. On char- 

 coal, it loses its color, imparting, at the same time, a beautiful green 

 color to the flame of the lamp. It is infusible. It contains 23 ... 24 

 per cent, of water. 



2. It has been found on a hill between the lakes Strieges and Frank- 

 ;,enberg, where it occurs in a transition flinty slate. 



8. It is probably a variety of Wavellite. 



PEGMATOLITE. (See Feldspar.) 



PELIOM. (See lolite.) 

 PELOKONITE. 



Massive ; composition impalpable. Fracture conchoidal. 

 Lustre vitreous, feeble. Color bluish black. Streak liver- 

 brown. Opake. 



tfardness = 3-0. Sp. gr. = 2-50 ... 2-56. 



1. It is very soluble in muriatic acid, the solution having a pistachio- 

 green color. 



