Question

talcum is the hardest substance in nature​

Answer 1

Answer:

In 1812, a geologist called Friedrich Mohs arranged ten reference minerals in order of hardness, the softest being talc - which you can scratch with your fingernail - the hardest, diamond, still the hardest substance known.

Answer 2

Answer:

In 1812, a geologist called Friedrich Mohs arranged ten reference minerals in order of hardness, the softest being talc - which you can scratch with your fingernail - the hardest, diamond, still the hardest substance known