PHYSIOGRAPHY. 209 



Flucerine Fluellite Fluor. 



3. It occurs at Finbo and Brodbo, near FahluD, imbedded in Albite 

 and Quartz. 



APPENDIX TO FLUCERINE. 



i. Fluate with excess oflase. 

 Traces of crystalline structure. Color yellow. 



It resembles porcelain jasper. Before the blow-pipe, it scarcely dif- 

 fers from the foregoing description. If heated alone on charcoal, it turns 

 black, at an incipient redness ; but assumes on cooling, successively, 

 dark brown, red and orange tints. It is composed, according to BER- 

 ZELIUS, of 



Fluoric acid - - - 10 85 



Peroxide of cerium - - - 84-20 

 Water 4-95 



It is found at Finbo. 



ii. Fluate of Yttria and Cerium. 



Earthy ; fc'jnd in masses seldom exceeding the size of a pea. 

 Color pale red, sometimes deep red, yellow or white. Easily 

 scratched by the nail. 



According to BERZEL.ITJS, it is a mechanical mixture of fluate of 

 yttria with fluate of cerium and silica. It gives nearly the same reac- 

 tions as the neutral fluate, first described. 



FLUELLITE. Fluor Haloid e? 



Octahedron, with a rhombic base. P on P / =144. 

 P on P" over the summit =109. 



Color white. Transparent. 



1. It occurs in minute crystals of the form above mentioned, having 

 its most acute solid angles replaced, along with the Wavellite from 

 Cornwall. It has been found to contain alumina and fluoric acid. 



2. Its hardness and specific gravity require to be known, before its 

 place in the natural system can be correctly determined. 



FLUOR. OctahedralFluor-Haloide. MOHS. 

 Primary form. Regular octahedron. 

 18* 



