What is cinnabars unique property?

Cinnabar, primarily composed of Mercury sulfide (HgS), is unique for its vivid red color and its properties as a significant source of mercury. It is one of the few naturally occurring minerals that contain mercury, making it crucial in various industrial applications, including the production of mercury. Additionally, cinnabar exhibits a distinct crystalline structure, typically forming in a rhombohedral shape, which sets it apart from other minerals. However, due to its mercury content, it is toxic and requires careful handling.