laumontite

[Named after Gillet Laumont, who first observed it; suff. -ite ( Min. ) (q. v.). Min.: A monoclinic mineral included in the uni silicates of Dana. Found in distinct crystals, also radiating or divergent. Hardne , 3.5 to 4; specific gravity, 2.25 to 2:36; luster, vitreous; transparent, translucent, becoming opaque and friable on exposure, through lo of water. Composition: A hydrated silicate of alumina and lime. Found in cavities in igneous and metamorphic rocks, also in veins traversing clay-slate. lâu-næ-ạ, lâu-ne-a, s. [Named after Mordant de Launay.] Bot.: A genus of Composites, tribe Lactucese (q. v.). Launœa pinnatifid a is common on the sandy coasts of India. The juice is used in that country as a soporific for children, and, mixed with oil prepared from Pongamia glabra , as an external application in rheumatism.