Jet (lignite)
Jet is a geological material and is considered to be a minor gemstone. Jet is not considered a true mineral, but rather a mineraloid as it has an organic origin, being derived from decaying wood under extreme pressure.
The English noun "jet" derives from the French word for the same material: jaiet. Jet is either black or dark brown, but may contain pyrite inclusions, which are of brassy colour and metallic lustre. The adjective "jet-black", meaning as dark a black as possible, derives from this material.
Read more about Jet (lignite): Origin, History, Properties, Authenticating Jet
Famous quotes containing the word jet:
“Gimme the Plaza, the jet and $150 million, too.”
—Headline, New York Post (Feb. 13, 1990)