Jet is a black organic substance which is a fossilized variety of brown coal, formed as a result of the compaction of driftwood over millions of years.
Jet has a dull lustre in rough form while vitreous lustre after polished. It is a stone with low S.G. (1.20 – 1.30) but high R.I. (1.66).
It is the key identifying feature of jet for separating it from its simulants.
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