Friedrich Mohs
1773–1839 (age 66)
Biography
Friedrich Mohs, the German mineralogist whose path led him into Vienna's mineral collections, brought clarity to the study of hard substances with a methodical eye and patient observation. His eponymous scale of mineral hardness, introduced in 1812, allowed scholars and miners to compare crystals using a human-friendly ranking that still guides geology students today.
As a teacher and curator, he nurtured a generation of mineralogists at the mining academy and within the city's laboratories, conveying the value of careful field notes and precise classification. The memorial in Vienna Central Cemetery stands as a quiet tribute to a scholar whose steady dedication keeps the Mohs scale alive in laboratories around the world.