!?2 Scientific Intelligence. [Juiiy;! 



except the two first^ it would follow from the preceding analysis 

 that andalusite is a subsesquisilicate of alumuia, or a compound 

 of 1 atom of silica and l-i- atom of alumina. 



IX. Karpholite. 



This is a name which Werner gave to a mineral found at 

 Schlackenwald in Bohemia. It is distinguished by the following, 

 characters : 



Its colour is usually of an intense straw yellow ; sometimes^ 

 though seldom, wax yellow. Always amorphous. The lustre is 

 strongly glimmering and pearly. Fracture fibrous. It is 

 opaque, and its hardness, in consequence of the uncommon faci- 

 lity with which it may be broken, cannot easily be determined. 

 Specific gravity, 2-933. The constituents of this mineral,, 

 according to an elaborate analysis of Professor Steinmann, are 

 as follows : 



SiHca 37-53 



Alumina 26*47 



Oxide of manganese 18-33 



Peroxide of iron 6-27 



Water 11-36 



99-96 



It seems to follow from this analysis that karpholite is a com- 

 pound of 10 atoms of sihcate of alumina, three atoms of silicate 

 of manganese, one atom of sihcate of iron, and eight atoms of 

 •water; so that its symbol will be 10 A S + 3 wi S +^8 + 8 

 A q. — (Schweigger's Journal, xxv. 413.) 



X. Boracic Acid. 



From a set of experiments made upon crystallized boracic 

 acid by Dr. Pleischl, of Prague, it appears to be a compound of 



Pure anhydrous acid 54 



Water 45 



99 



Dr. Pleischl made a set of careful and elaborate experiments 

 to determine whether anhydrous boracic acid be capable of 

 decomposing fused chloride of barium ; but the results corres- 

 ponded with those of Gay-Lussac and Thenard, no decomposi- 

 tion nor chemical combination was obtained. — (Schweigger's 

 Journal, xxv. 438.) 



XI. Peliom. 



This is a name given by Werner to a mineral from Bodenmais, 

 ■which he constituted into a new species. It seems to be inti- 

 mately connected with the iolite. Its specific gravity is 2-714. 

 Jts fracture is small conchoidal. Its lustre shining and glassy. 



