The correct answer is - B. talc is the softest mineral.
Explanation:
Mineral talcs are clay mineral made up of hydrated magnesium silicate that is a translucent mineral with a pearly luster and not metallic luster. It is the softest mineral present with hardness of 1 on Mohs scale.
It is cleaves in thin layers to make powder or talc. It is used as baby powder mixed with corn starch. The chemical formula is Mg3Si4O10(OH)2.
