Jis forJet (stone)
Jet, also called lignite, is not a true mineral or stone. It is fossilised decaying wood. The original structure of the wood can be seen in jet under a microscope.
Jet is black and has been used to make jewellery for many years. It was quite popular to make mourning jewellery, for wearing at funerals.
Jis forJet (aircraft)
A jet is the common name given to any airplane that is powered by jet engines rather than propellers. Most modern aircraft are powered by jet engines, so people tend to refer to smaller, faster military aircraft as jets.