riolite

[After Del Rio, and Greek lithos =a a stone.] Min.: The same as ON OF RITE (q. v.). sin, aş; expect, Xenophon, exist. ph = L rionite ri-o-nite, s. [Etym. doubtful, but prob. after Del Rio; n connect., and suff. -ite ( Min.).] Min.: A variety of tetrahedrite (q. v.), containing 13 per cent. of bismuth, for which metal it is worked at Cremenz, Einfischthal, Wallis, Switzerland.