Note 14 — HOME STUDIES IN CHEMISTRY AND PHYSICS.

“Lignite.” Also called brown coal. It is the most imperfectly mineralized form of coal. In some instances plants are so little changed that they can easily be classified by the structure of the leaves and the fruit. The fiber has become so impregnated with bitumen that it burns with its peculiar flame and smoke. The jet so much used in jewelry is a black variety of lignite, very compact in texture, and taking a high polish.