PHYSIOGRAPHY. 125 



Pyrochlore. 



2. Analysis. 



By NORDENSKIOLD. 



Silica 56-62 



Magnesia 23-38 



Alumina 3-38 



Lime ------ 5 58 



Oxide of iron 0-99 



Protoxide of manganese ----- 0-99 



Water 3-58 



Bitumen and loss ------ 6*38 



3. It occurs at Storgard in the parish of Pargas in Finland, with Feld- 

 spar, Augite, Sphene and Calcareous Spar. 



PYRANEITE. (See Garnet.) 



PYRARGILLITE. 



In crystals, which are four-sided prisms with truncated angles, 

 and massive. 



Color blackish, and shining. 

 Hardness = 3-5. Sp. gr. = 2 505. 

 It emits a clayey odor. 



1. Analysis. 



By NoRDENSKIOiD. 



Silica 4393 



Alumina 28-93 



Protoxide of iron 5-30 



Magnesia, with some protoxide of manganese . 2-90 



Potash . . ... . . 1-05 



Soda . . . . . . . 1-85 



Water 15-47 



2. It is found in Finland. 



PYROCHLORE. Pyrochlore Eruthrone-Ore. 



Primary form. Regular octahedron. 



Fracture conchoidal. 



Lustre resinous to vitreous. Color reddish-brown. 

 Streak clear-brown. Opake. 



Hardness =5-0 . . . 6*0. Sp. gr. =4-2. 



11* 



