Antimony is soluble in water

Antimony (III) sulfide Sb2S.3 

Dark gray to black
crystalline powder or
orange-red, amorphous powder
Mineral stibnite
molar mass 339.715 g / mol

AGW 0.006 mg / m³ A (TRGS 900)
density 4.562 g / cm3   
Melting point +550 ° C
Water solubility   
HP rates (see note) P 280.3
disposal G 4
Print a labelGerman nameEnglish name
CAS1345-04-6Antimony (III) sulfideAntimony (III) sulfide
Effects on the human body

Repeated inhalation of dusts can cause chronic diseases of the lungs or the cardiovascular system. Results from animal experiments with antimony (III) sulfide suggest that antimony (III) sulfide could also be carcinogenic for humans.


Antimony (III) sulfide occurs in two modifications: The orange-red, amorphous form is not stable. When heated in the absence of oxygen, the dark gray, crystalline form is obtained. When heated vigorously in air or in a stream of oxygen, antimony (III) sulfide oxidizes to antimony (III) oxide and sulfur dioxide. In boiling water or with steam it slowly decomposes to form antimony (III) oxide and hydrogen sulfide. Explosive reactions can occur with oxidizing agents such as potassium chlorate or silver oxide.

When the mineral stibnite is separated from the gangue, only an impure product is obtained. The stibnite is first heated to around 550 ° C so that the low-melting antimony sulfide flows out in its pure form. This up to 98 percent pure antimony sulfide comes as a dark gray Antimonium crudum in the trade. The orange-red modification is obtained by introducing hydrogen sulfide into an acidic, aqueous antimony (III) chloride solution. When the elements antimony and sulfur melt together, antimony (III) sulfide is also formed.
Antimony (III) sulfide is found in match heads together with potassium chlorate. When rubbing against the friction surface, which is made of red phosphorus, there is a small jet of flame that ignites the match. Antimony (III) sulfide can also be found as an additive in fireworks. As a light-sensitive semiconductor, it is used in optoelectronic devices. In a redox reaction, antimony (III) sulfide can also be produced with iron in a crucible:

Sb2S.3 + 3 feet 2 Sb + 3 FeS

Antimony black was a historical pigment that was extracted from the mineral stibnite: Even the women of the Egyptians used it to make black eye make-up. Due to its bactericidal effect, it was used in creams to treat wounds and ulcers in ancient times. Paracelsus later even used it for internal treatment. Due to its toxicity, it is no longer used for medical or cosmetic purposes today.