Multiple choice general knowledge What is the softest of all minerals? Gold Talc Silver None Reveal answer Fill a bubble to check yourself B Correct answer Explanation Talc is the softest mineral on the Mohs hardness scale, with a hardness value of 1. This means it can be scratched by all other minerals. Gold and silver are metals with much higher hardness values (gold is 2.5-3, silver is 2.5-3 on the Mohs scale).