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Jet is what
A form of fossilized wood.
Buried in muddy sediment on see floor or stagnate swaps.
At increased temperature in oxygen depleted conditions. Some times the wood structure can be seen
What Whitby jet
I comes from the a relative of monkey puzzle tree (araucaria araucana)
Imitations
Glass and plastic
Vulcanized rubber
Coal anthracite
Bog oak more brown than black
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