Hargreaves, which became part of the Sylvanite Mine. It occurs with native tellurium, rickardite, petzite, and sylvanite. For some minerals (e.g., sylvanite for KCl), fatty amines are used as collectors. They include calaverite, sylvanite, nagyagite, petzite and krennerite. These include natural gold tellurides, like calaverite and krennerite (AuTe), and sylvanite (AgAuTe). They are also present in the Sylvanite Mine, though sylvanite is not one of them. The ground staked by Wright and Hargreaves eventually became three mines&colon; Sylvanite, Lakeshore and Wright-Hargreaves. Sylvanite is found in Transylvania, from which its name is partially derived. Sylvanite crystallizes in the monoclinic 2/m system. Sylvanite represents a minor ore of gold and tellurium. Sylvanium, an obsolete term for tellurium, derived its name from sylvanite.