11.—Blende.
Occurs in crystals and masses; waxy lustre, but not always very apparent; usual color, rosin-yellow to dark brown; brittle; the powder, which is whitish to reddish-brown, dissolves in muriatic acid giving off the odor of rotten eggs; by roasting gives off sulphur-fumes; infusible alone, but on charcoal at a high heat gives off white fumes; gravity 4.
Value.—An ore of zinc (containing sixty-six per cent.) and a source of white vitriol. Often worked for its Silver and Gold.
Localities.—Found with lead and other ores. Lubec and Bingham, Me.; Eaton, Warren and Shelburne, N. H.; Sterling, Southampton and Hatfield, Mass.; Brookfield, Berlin, Roxbury and Monroe, Conn.; near Wurtzboro’, Cooper’s Falls, Mineral Point, Fowler, Ancram, Clinton and Spraker’s Basin, N. Y.; Wheatley and Perkiomen lead-mines, Schuylkill, Shannonville and Friedensville, Pa.; Austin’s lead-mine, Va.; Haysboro’, Brown’s Creek and Polk Counties, Tenn.; Prince Vein, Mich.; Dubuque, Ia.; Warsaw, Rosiclare and Galena, Ill.; Shullsburg, Wis.; Stillwater, Minn.