Zoisite is named after the foundry owner, natural scientist, minerologist and collector, the baron Sigmund Zois. The mineral crystalizes in othorhombic system, is usually gray although it can be brownish, greenish, or bluish. Chemically it is a calcium-aluminium silicate with the formula Ca2Al3[O/OH/SiO4/Si2O7]. In 1894 it was found by the mineral dealer Simon Prešern at the Svinška Planina in Carinthia. It was brought to Sigmund Zois, who determined the until then unknown mineral and informed European minerologists. In 1905, after full investigations, it was named zoisite.