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>Jet is a type of lignite, the lowest rank of coal, and is a gemstone. Unlike many gemstones, jet is not a mineral, but is rather a mineraloid. It is derived from wood that has changed under extreme pressure.
According to Science coal is a gemstone. How to jakposters respond to this?
https://en.wikipedia.org/wiki/Jet_(gemstone)
According to Science coal is a gemstone. How to jakposters respond to this?
https://en.wikipedia.org/wiki/Jet_(gemstone)
