Intelligence a7id Miscellanems Articles. 445 



SiUca 40-59 40-26 



Soda 17-38 17-66 



Potash 0-57 0-82 



Alumina 28-29 28-24 



Lime 7-06 6-34 



Loss 6-11 100 6-68 100 



The alumina contains a little oxide of iron ; and it also contains a 

 trace of chlorine, which also exists in the elseolite of llmengebirge. 

 The formula, according to this analysis, is 



N3Si + 3AiSi + CaC. 



The cancrinite is thus a combination of eljeolite with carbonate of 

 lime, as the sodaUte is a combination with chloride of sodium. — 

 Annales ties Mines, torn. xvii. 



INofe. — All the specimens which have been received in this coun- 

 try named cancrinite are blue. The specimens named sodalite, are 

 reddish and opake. — Ed.] 



ANALYSIS OF HAUYNE, BY M. F. VARUENTRAPP. 

 Haiiyne is found in small and large grains in the porous basalt of 

 Nieder-Mendig, near Andernach on the Rhine. When this mineral 

 is treated with hydrochloric acid, it soon becomes evident that a me- 

 tallic sulphuret is decomposed, and it is important to ascertain the 

 proportion of sulphur ; to effect this the powdered mineral is put 

 into a retort connected with a Woulfe's apparatus containing a solu- 

 tion of chloride of copper, and hydrochloric acid is to be poured upon 

 the mineral previously moistened : the hydrosulphuric acid expelled 

 precipitates the copper from the chloride in the state of sulphuret. 

 When this operation is over, the solution remaining in the retort is 

 diluted with water, and the silica is separated in the usual way, and 

 the sulphur, using the requisite precautions, is determined by the 

 quantity of sulphuret of copper obtained. The chlorine is ascer- 

 tained by decomposing a small portion of the mineral with nitric 

 acid ; the sulphuric acid is precipitated by chloride of barium . 

 The results obtained were the following : — 



Sulphuric acid 12-602 



Sihca 35-012 



Soda 9-118 



Lime 12-552 



Magnesia 27-415 



Sulphur.. 0-239 



Iron 0-172 



Chlorine 0-581 



Water 0-619 98-310 



'Annales ties Mines, tom, xvii. 



ON THE PRODUCT.S OF THE ACTION OF POTASH ON INDIGOTIN 



— CHRYSANILIC ACID.* 



M. Fritzsche states that when indigotin is treated with a hot 



concentrated solution of potash, the liquor becomes a crystalline 



* Sec preceding volume, p. 191, and present volume, p. 35. 



