42 
METALLIC COMPOUNDS. 
Stibiate of 
zinc. 
Stibiate of 
manganese. 
Stibiate of 
iron. 
Stibiate of co- 
balt. 
not, consequently, obtain a more precise result than I have before 
stated. 
Stibias zincicus produces a heavy precipitate, soluble to a 
certain degree in water, which is at last deposited in the form 
of a powder, which covers the sides as well as the bottom of 
the glass, and, after washing and drying, has a crystalline ap- 
pearance like carbonate of lime. When heated in a glass re- 
tort the stibiate of zinc gives out its water of crystallization, 
and becomes yellow. It is not reduced by the blow-pipe upon 
charcoal. 
Stibias manganosus is a white pow T der, very little soluble in 
water, and preserving its colour in the air as well when humid 
as when dry. In the fire it gives out water and becomes grey- 
ish, which seems to be owing to a slight oxidation. Exposed 
to a very elevated temperature, the stibias manganosus resumes 
its white colour by a change, concerning which I shall speak 
hereafter. 
Stibias ferrosus is precipitated perfectly white, and preserves 
its white colour as long as it is covered with water. If it be 
put on the filtre and washed, it changes its colour, by the con- 
tact of the air, into a yellowish grey. By heat it gives cut 
water and becomes red. Upon charcoal in the interior flame 
of the blow-pipe, it becomes reduced. The antimony is vola- 
tilized, and the iron remains obedient to the magnet. 
Stibias cobalticus is the most soluble of the stibiates, though 
its solubility is not very considerable. The precipitate which 
is first formed is again dissolved, until a certain quantity of the 
precipitating liquor has been added. The precipitate is red 
flocculent, and contracts, after a time forming crystalline grains 
of a rose colour, which are deposited mostly on the sides of 
the vessel. When exposed to a cherry red, it loses its water 
of crystallization, and is diminished precisely one-third of its 
weight. The stibiate deprived of water is of a deep violet 
blue. By heat in an opeift vessel it becomes of a blackish 
brown, probably by the increased oxidation of the oxide of 
cobalt. If what I have stated of the capacity for saturation 
of the stibic acid be well founded, this salt will be composed 
of 52 p. acid, 14 oxide of cobalt, and 33*3 water. 
The oxide of cobalt contains 2 99 p. oxigen and 29*39 
water. 
