leucosphenite

Century Dictionary and Cyclopedia

1. n. A titanosilicate of barium and sodium, which occurs in wedge-shaped monoclinic crystals, white to grayish blue in color, with vitreous to pearly luster: obtained from southern Greenland.

Wiktionary

1. n. mineralogy A monoclinic-prismatic mineral containing barium, boron, oxygen, silicon, sodium, and titanium.