208 PHYSIOGRAPHY. 



Figure-stone Flucerine. 



1. Before the blow-pipe, it is infusible, but becomes white. It is part- 

 ly soluble in sulphuric acid, leaving a siliceous residue. 



2. Analysis* 



By KLAPROTH. By THOMSON. 



Silica - - 54-50 - 49-816 



Alumina - - 34-00 - - 20*596 



Potash 6-25 - - - 6-800 



Lime - - 0-00 - - - 6-000 



Oxide of iron - - 0'75 - - - 1-500 



Water 4-00 - - - 5-000 



3. It is brought from China, gj^ess characteristic varieties have been 

 found also in Transylvania and in Saxony. 



4. It is cut by the Chinese into various ornaments and grotesque shapes. 



FIORITE. (See Opal.) 

 FLINT. (See Quartz.) 



FLUCERINE. Rhombohedral Tungstic- 

 Bary te. 



Primary form. Rhomboid, of unknown dimensions. 



Six-sided prisms, plates and amorphous masses. 



Cleavage most distinct perpendicular to the axis, or par- 

 allel with the base of the hexagonal prism. 



Fracture uneven and splintery. 



Color reddish white to yellow. Streak white to yellow* 

 Opake or translucent on the edges. 



Hardness =5-50 . . . 5-75. Sp. gr. =4-7. 



1. Heated in the matrass, or the glass-tube, it corrodes the glass. 

 Alone, it does not fuse, but its color changes to brown ; with borax and 

 salt of phosphorus, it gives a red or orange colored globule, which be- 

 comes pale on cooling. 



2. Analysis. 

 By BERZELITJS. 



Fluoric acid 16-24 



Peroxide of cerium ------ 82-64 



Yttria - M2 



