wulfenite

[After the Austrian mineralogist, Wulfen; suff. -ite ( Min.).] Min.: A mineral occurring mostly in crystals; system, tetragonal. Hardne , 2.75-3; specific gravity, 6-03-7-01; luster, resinous to adamantine; color, shades of yellow, siskin and olive green, sometimes orange or bright red. Composition: Molybdic acid, 38'5; protoxide of lead, 61'5=100, corresponding with the formula PbOMO3. The orange and red colored varieties owe their color to the presence of vanadic acid. wull, s. & v. i. [WILL, 8. & v.] (Scotch.) wum-il, s. (WIMBLE.) ( Scotch .) wür-rus, war-as, s. [The African name of the powder.] Comm.: A powder sold in African bazaars as an anthelmintic and a dye plant. It was long believed to be identical with kamala (q. v.), but it has been shown by Capt. Hunter, A istant Resident at Aden, that wurrus consists of the glandular hairs on the legumes of Fleming i a congest a, wild in Africa and India. ( Calcutta Exhib . Report, pt. v., 174.) wûrtz-ite, subst. [After the French chemist, Adolphe Wurtz; suff.- ite ( Min.).] Min .: A dimorphous form of blende (q.v.). Crys tall i zati on, hexagonal, being isomorphous with greenockite. Hardne , 3.5-4; specific gravity. 3.98; luster, vitreous; color and streak, brownish to brownish-black. Found crystallized near Oruro, Bolivia. Breithaupt states that the radiated (cadmiferous) blende of Przibram, Bohemia, is hexagonal in crystallization; his Spiauterite (q. v.).