noun a mineral, a telluride of gold and silver, of a steel-gray, silver-white, or brass-yellow color. it often occurs in implanted crystals resembling written characters, and hence is called graphic tellurium.
2. sylvanite ·add. ·noun a telluride of gold and silver, (au, ag)te2, of a steel gray, silver white, or brass yellow. it often occurs in implanted crystals resembling written characters, and hence is called graphic tellurium. h., 1.5-2. sp.gr., 7.9-8.3.