Stibnite, the primary ore of Antimony, is a sulfide mineral. It occurs in hydrothermal veins, hot-spring deposits, and replacement deposits that form at low temperatures (up to 400°F/200°C). It's named after the Latin stibium, which is the old name of the element Antimony (Sb). Natural Stibnite crystals can be long, slender prismatic, lustrous, and shiny, often with a sword-like in appearance, but occasionally can tarnish with a dull or iridescent coating.
As beautiful as Stibnite is, it is toxic. It is one of the top 10 toxic minerals. It should not be used in elixirs, or near pets/children. Wash hands thoroughly after use. Please do your own research before purchasing.