What does jet look like?

Jet is a type of lignite, a precursor to coal, and is often recognized for its deep black color and smooth, shiny surface. It can sometimes appear with a slightly glossy finish and may show faint wood-like patterns or striations. When polished, jet can exhibit a rich, velvety texture, making it popular for jewelry and ornamental pieces. It is lightweight compared to other gemstones and can be carved easily.