poly arg rite

[Pref. poly-, and English argyrite (q. v.).] Min.: A name given by Sandberger to an isometric mineral found at Wolfach, Baden. Hardne , 2.5; specific gravity, 6974; luster, metallic; color and streak, black to blackish-gray; malleable. Composition: Sulphur, 1447; antimony, 7'37; silver, 78-16-100. pol-ý-ar-thrŭs, s . [Pref. poly- , and Gr. arthron =a limb.] Zool.: A genus of Rotifer a, family Hydatinea. It has a single eye on the neck, six pinniform proce es on each side of the body; foot wanting.