Description: (German Geologist Remembered for His Pioneering Research on 'Microscopic Petrography')
German geologist and petrographer Ferdinand Zirkel is remembered for his pioneering contribution to microscopic petrography. He also taught mineralogy at Lemberg University and penne the iconic work Lehrbuch der Petrographie, or Manual of Petrography, which is considered a classic in geology. He later chaired mineralogy at the University of Leipzig.