Franz Eugen Hussak, Austrian-born Brazilian mineralogist and petrographer (Wilden, Steiermark 10 March 1856 – Poços de Caldas, Minas Gerais State 05 September 1911)
First described the pseudoleucites (1890)
Presented first accurate reports about microstructure of titaniferous iron ores
DESCRIBED NEW MINERAL SPECIES
Gorceixite (1906)
Zirkelite (1895) with Prior
Senaite (1898) with Prior
Lewisite (1895)
Derbylite (1895) with Prior
Tripuhyite (1897) with Prior
Florencite (1899) with Prior