The Mohs' scale of hardness is named after Friedrich Mohs, who chose ten minerals as references points for comparative hardness, with talc the softest (1) and diamond the hardest (10).
(The Mohs' scale of hardness; is named; after Friedrich Mohs) (Friedrich Mohs; chose; ten minerals; as references points for comparative hardness)
The Mohs' scale of hardness Friedrich Mohs
is named chose
after Friedrich Mohs
ten minerals as references points for comparative hardness