36 On Haidingerite, a new Mineral species. > 
pure sulphuretted hydrogen is disengaged, and the whole dissolves; excepting a small 
quantity of quartz and of iron pyrites, hat without any deposit of sulphur, ihe 
liquid holds in solution only antimony, iron, and a very small quantity ot zinc. 
These properties show sufficiently, that Haidingerite is composed of sulphuret oi an. 
timony, and sulpliurct of iron, and that the two metals are louud at the minimum 
of sulphur at ion. m , . , . - , , T 
The analysis was conducted as follows. To determine the quantity of sulphur, I 
heated four grammes of the powder well ground, with twenty grammes of dry car. 
bonate of soda, and ten grammes of nitre in a silver crucible ; a slight action appeared 
to begin at a dull red beat, but without deflagration, and without swelling up ; at a 
red heat, '. lie matter entered into a very liquid and complete fusion. After being 
diluted and well washed with water, there remained mi the filter antimoniate of 
iron, of a pale, ochreous, red colour, and which, judging from its weight, must re- 
tain potash in combination. The solution made to boil, after having been satur- 
ated with pure nitric acid to drive off the carbonic acid, yielded with muriate of 
barvtes, a precipitate of sulphate of barytes, from the weight -of which it was easy 
to determine the proportion of sulphur. 
To ascertain the quantity of quartz and of pyrites, a certain weight of the pow- 
dered mineral was boiled ill concentrated muriatic acid ; the residue was then dried 
and weighed, and afterward treated with aqua regia, calcined, and weighed anew. 
The insoluble matter was pure quartz. The difference gave the proportion of py- 
rites. 
I sought the proportion of the antimony and iron in two ways : 
1. I dissolved by means ofmuriatic acid, a certain quantity of Haidingerite which 
I hadjpiaceil in a retort, the beak of which dipped into a vessel containing water ; 
I remarked that towards the end of the operation, a brown flaky deposit was form- 
ed in that vessel, of sulphuret of antimony. The quantity of it was very small, 
hut was ascertained. The production of this sulphuret proceeds-from the muriatic 
vapour disengaged, when the solution has acquired a certain degree of concentra- 
tion, and carrying along with it a small quantity of chloride of antimony, which, 
condensing in the water already charged with sulphuretted hydrogen, must be decom- 
posed immediately. I added a great deal of water to the strongly concentrated solu- 
tion, to precipitate the major part of the antimony in the state of oxy-chloride, the 
composition of which is known. This oxy-chloride was mixed with the quartz and 
pyrites ; but the proportion ot these substances was determined previously. 
The rest of the antimony was precipitated from the solution, by means of a cur- 
rem, of sulphuretted hydrogen gas; after which, the liquor was concentrated and 
boiled with nitric acid, to convert the iron to the state of peroxide, which was after- 
wards precipitated by an excess of ammonia. The ammoniacal solution gave a slight 
sulpha t >reCl ^ ltate 0t Su 'l ) ' xurul °I '■cine, on adding a few drops of an alkaline hydro- 
. After havin K dissolved the Haidingerite as alwvementioned, I added tartar. 
ic acid to the solution, as pointed out by Mr. H. Rose, of Berlin, and diluted it with 
water ; it did not become at all turbid, aud I was afterwards able to precipitate the 
woe of the antimony from it in the state of sulphuret, by means of sulphuretted 
ydrogen. I weighed this sulphuret while warm, and convinced myself that it con- 
tained no excess of sulphur, by dissolving it in muriatic acid. The iron was after- 
wards determined by ammonia. 
The mean result of several analyses 
Quartz 0.032 
Iron pyrites 0.032 
Sulphur 0.283 
Antimony 0.483 
Iron 0.149 
Zinc 0.003 
0.982 
or, independently of the gangue or rock, 
Sul; hur 0.303 which gives Sulphuret of antimonv n 
0 100 Proto-sulphuret of Sfc"— ^ 
01 60 Sulphuret of zme 0 .005 
Antimony , 
Iron 
Zinc 
0.003 
0,980 
0.975 
