Wilhelm Karl Ritter von Haidinger

Wilhelm Karl Haidinger (5 February 1795 – 19 March 1871), ennobled as Wilhelm Ritter von Haidinger in 1864, was an Austrian mineralogist. == Early life == Haidinger's father was the mineralogist Karl Haidinger (1756–1797), who died when Wilhelm was only two years old.

Source: Wikipedia — Wilhelm Karl Ritter von Haidinger (CC BY-SA 4.0)