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August Breithaupt
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Johann Friedrich August Breithaupt was a German mineralogist and professor at Freiberg Mining Academy in Freiberg, Saxony.
Relief portrait on the Werner building in Freiberg
Friedrich
Mohs
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Carl Friedrich Christian Mohs was a German chemist and mineralogist. He was the creator of the Mohs scale of mineral hardness. Mohs also introduced a classification of the crystal forms in crystal sys
Friedrich Mohs, 1832
Memorial plaque in Vienna