Supposed to be wood in an advanced state of bitumenization, abundant in the upper lias shale near Whitby in Yorkshire. It is also found n Colorado, the island of Skye, and various parts of the European continent, and is used as fuel and for making ornamental articles. It is of varying hardness and of sp. gr. about i3.
Did you find this definition of JET helpful? You can share it by copying the code below and adding it to your blog or web page. Definition of JET