40 New Mineral from Sussex County, New- Jersey, 



potassa was added until effervescence ceased, when crystals 

 of tartaric acid were thrown in, by which a copious white 

 precipitate was produced. 



(7) This precipitate (6) was decomposed by heat, which 

 being pushed too hastily, a portion of charcoal was left ; lest 

 any carbonate of potassa should be present, in consequence of 

 a portion of the precipitate (6) being the difficultly soluble 

 bitartrate of potassa, the mass was washed with very weak 

 vinegar. To separate the carbon, the mass was again acted 

 upon by a small quantity of muriatic acid, and the solution 

 filtered. 



(8) The new muriatic solution was decomposed by ammo- 

 nia, which threw down a red precipitate, that when washed and 

 dried, weighed 6.16 grains. 



(9) Lest the acetic acid (7) had carried off any part of the 

 mineral, it was tested with ammonia, but no precipitate en- 

 sued. 



(10) Into the liquor remaining after precipitation by tar- 

 trate of potassa and tartaric acid (6), ferrocyanate of potassa 

 was dropped ; a milky appearance first took place, and finally 

 a copious precipitate of a pale blue colour. This precipitate, 

 when dried, weighed 28.9 grains ; which, supposing it to be a 

 ferrocyanate of the protoxide of iron, and its equivalent 

 number 99, gives on reduction 10.5 grains protoxide of iron. 



(11) To the liquor yet remaining, (10) carbonate of am- 

 monia was added : a white powder was thrown down, weighing 

 1.84 grains. 



(12) The ammoniacal liquor, and washings after the first 

 precipitation (5) were boiled for an hour, but no precipitate 

 ensued ; being then acted upon by carbonate of soda, a gray- 

 ish precipitate fell, weighing when dried 20.92, and manifest- 

 ing the presence of 12.04 grains caustic lime. 



