Sylvanite is a rare mineral composed of gold and silver, often found in association with other types of ores. Other synonyms for sylvanite are graphic gold, auricupride, and krennerite. Graphic gold is a term used to describe sylvanite with a unique pattern resembling a branch. Auricupride is a metallic mineral that consists of copper and gold, and is usually found in sulfide deposits. Krennerite is a selenide mineral consisting of gold, silver, and tellurium. All of these minerals are highly sought after by both collectors and industry professionals due to their rarity and desirable chemical properties.