65.—Smithsonite.
Occurs in masses, often rounded, covered with minute crystals, or honeycombed; color white, dirty yellow or stone color; glassy lustre; brittle; effervesces in nitric acid; barely scratches glass; barely translucent; gravity 4.4.
Value.—Yields fifty per cent. of zinc.
Localities.—Found generally in limestone with galena and blende. Friedenville, Lancaster and Perkiomen, Pa.; Linden and Mineral Points, Wis.; Lawrence, County, Ark.; Ewing’s Diggings, Minn.