Antimony trisulfide, with the chemical formula Sb2S3, is a chemical compound composed of two antimony ions (Sb3+) and three sulfide ions (S2-). It is a naturally occurring mineral known as stibnite, which forms long, metallic, bluish-gray crystals. Stibnite is one of the most common and important antimony minerals.

Antimony trisulfide has several key properties and uses, including:

1. Antimony Production: It is a primary source of antimony metal. Antimony trisulfide is roasted to produce antimony oxide, which is then reduced to produce antimony metal, an important element used in various applications.
2. Pyrotechnics: Antimony trisulfide is used in pyrotechnic compositions to produce effects such as glitter and sparkles in fireworks.
3. Pigment: It is used as a black pigment in certain applications, such as in paints and inks.
4. Traditional Medicine: Historically, stibnite (antimony trisulfide) was used in traditional medicine for various purposes. However, its use in medicine has declined due to its toxicity.

Stibnite, or antimony trisulfide, is considered toxic and should be handled with care. It contains antimony, which is known to be toxic to humans and can cause health effects if not handled properly. Therefore, it is important to use appropriate safety measures, including using personal protective equipment, when working with stibnite or any antimony-containing materials.

As a mineral and a source of antimony metal, antimony trisulfide plays a crucial role in the production of antimony and its various applications. In other areas, such as pyrotechnics and pigments, its unique properties contribute to specific visual effects and colorations.