100 PHYSIOGRAPHY. 



FIGURESTONE OR AGALMATOLITE. 



Figurestone or Agalmatolite. JAM. Syst. Vol. II. p. 261. 

 Man. p. 126. Agalmatolite. PHILL. p. 119. 



Massive : composition impalpable. Fracture coarse 



splintery, imperfectly slaty. 

 Colour white, grey, green, yellow, red, and brown, 



none of them bright. Acquires some lustre in 



the streak. Translucent, in most cases only 



on the edges. 

 Nearly sectile. Soft. Sp. Gr. == 2-815, KLAPROTH. 



Before the blowpipe it is infusible, but becomes white. 

 It is partly soluble in sulphuric acid, leaving a siliceous re- 

 sidue. It consists, according to KLAPROTH, of 



Silica 54-50. 



Alumina 34-00. 



Potash 6-25. 



Oxide of Iron 0-75. 



Water 4-00. 



It is brought from China. Less characteristic varieties 

 have been found also in Transylvania and in Saxony. It 

 is cut into figures and different ornaments. 



FLUATE OF CERIUM. 



Fluate of Cerium. BERZELIUS. On the Blowpipe, transl. 

 by J. G. CHILDREN, p. 209. PHILL. p. 266. 



i. Neutral Fluate. 



Six-sided prisms, plates and amorphous masses. 

 Colour reddish. 



It has been found by BERZELIUS to consist of 30-43 

 fluate of protoxide of cerium, and 68-00 fluate of peroxide 

 of cerium, with a trace of yttria. Heated in the matrass 

 or the glass tube, it corrodes the glass ; alone it does not 



