BOLE, an opaque, earthy mineral, occurring in solid amorphous masses, of a yellow, red, or brownish colour. It yields to the nail, and cuts easily, has a conchoidal fracture, with a shining streak, and adheres to the tongue. Its specific gravity is between 1.60 and 2.00, and when thrown into water it emits a crackling noise, and falls to pieces. It occurs in wacké and basalt at Striegau in Silesia, at Hachichtwald in Hesse, near Siena in Tuscany, and among the cliffs of the Giant's Causeway, Ireland. Armenian bole is used as a coarse red pigment.