List Sulphide Minerals 911 Metallurgist
Color, yellow, brown, black, sometimes nearly colorless; the black color is usually due to iron sulphide; rarer colors are red, white, and green; pure zinc sulphide is white; powder, brownish, yellow, or white; the darker varieties, (black jack,) which are the commonest, give a brownish powder; luster, resinous, particularly in the light ...