A JET MINE FROM NORTH YORKSHIRE

Описание к видео A JET MINE FROM NORTH YORKSHIRE

Follow us in this short film exploring a very unique Jet mine in North Yorkshire !, 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.

Unlike lignite Jet stone is not laminated and so has littletendency to split but breaks with a conchoidal fracture.It can be worked readily on a lathe and takes a high glossy polish. Jet had been Used for ornaments from the Bronze Age to The present time !

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