ISM.] Mineral called Hamjne, 197 



with some alcohol ; the liquid set to evaporate in the sun deposited 

 large cubes, which being fused in a platinum crucible weighed 

 0*654 gramme. 



The portion of sulphate of lime which had precipitated weighed 

 about 001 gramme. Muriate of barytes and oxalate of potash 

 formed nearly the same quantity of precipitate when dropped into 

 the solution. The oxalate of lime thus obtained being dissolved in 

 muriatic acid, the sulphuric acid was precipitated from the liquid 

 by means of muriate of barytes. The sulphate of barytes obtained 

 weighed 0-049 gramme, indicating, according to the estimate of 

 Berzelius, 0-01666 gramme of sulphuric acid. Hence we may 

 estimate the sulphate of lime, on the authority of Bucholz, at 

 0*0286 gramme. This quantity, together with the 001 gramme 

 of sulphate of lime not dissolved, being subtracted from 0*654 

 gramme of salt, leaves 0*616' gramme for the weight of the whole 

 muriate of potash contained in the ignited powdtr. 



Now according to. Bucholz, 0*616 gramme of muriate of potash 

 contain 0*498 gramme of potash. Hence the whole mass, amount- 

 ing to 2*330 grammes, must have contained 0*717- gramme of 

 pure potash. 



m — The sulphate of lime (in paragraph I) left undissolved being 

 collected from the three filters, - weighed after ignition 0*527 

 gramme, and was a white powder. Now as the gypseous mass 

 heated to redness weighed 1*336 gramme, from which 0*616 

 gramme of muriate of potash, and 0*038 + 0*527 gramme of 

 sulphate of lime, were obtained, it follows that there is a deficit of 

 0*155 gramme, which, as the filters were always well washed, 

 must be ascribed to sulphate of lime adhering to these three filters; 

 so that the quantity of sulphate of lime must amount to 0*720 

 gramme, or to 1*037 gramme in the wnole gypseous mass. 



"• — The alcohol solution of paragraph h, being mixed with 

 water, was evaporated, some drops of nitric acid being added 

 during the evaporation to oxidate the iron to a maximum, and gra- 

 dually reduced to a dry mass. The mass, being mixed with water, 

 was passed through the filter, in order to separate some floccules of 

 silica, which might be estimated at about 0*002 gramme. A suffi- 

 cient quantity of caustic ammonia being added to the filtered liquid, 

 a copious white precipitate fell, which was separated by the filter. 



o. — '1 his precipitate, being separated from the filter, was boiled, 

 while still moist, in caustic alkali. The whole was dissolved, 

 except some flocks of hydrate of iron, which being collected on the 

 filter, washed, and dried on the sand-bath, weighed 0*0/5 gramme, 

 indicating about 0*06 gramme of oxide of iron. 



p- — The alkaline solution of the last paragraph, being mixed 

 with sal ammoniac, let fall a white matter, which, when edulco- 

 rated, and dried on the sand-bath, weighed 1'120 gramme. Of 

 this 1*058 gramme, being heated to redness in a platinum crucible 

 for half an hour, was reduced to 0*697 gramme. Hence the 



