scoriaceous (skoriashius)

[ Portions [of lava] where the cells occupy about as much space as the solid part, and vary much in size and shape, are called scoriaceous , this being the character of the rough clinker-like scorise of recent lava streams. A. Geikie, Text-Book of Geol. (2d ed.), p. 94. scoriæ, n. Plural of scorial . scorie (skō'ri), n. Same as scaury . scorification (skōri-fi-kā'shon), n. [ fication ).] 1. In a aying , a method of a ay of the precious metals, performed by fusion of the ore with metallic lead and borax in a so-called scorifier. In this operation, the silver with the gold is taken up by the lead, the superfluous lead and the base oxids being separated in the form of a slag or scoria. The metallic ma obtained is afterward treated by the cupellation proce to separate the gold and silver. 2. In metal., the treatment of a metal with lead in the refining proce . Copper intended for rolling into sheets is sometimes thus treated in order that traces of antimony and other foreign metals may be removed. These combine with the oxid of lead, which rises to the surface of the molten copper in the form of a slag or scoria, which is then skimmed off before casting.