Mohr's scale..Mineral softer than talc.

Are there any minerals softer than 1 on Mohr’s hardness scale? Talc is a one.

Talc is it. Listed in the Guinness Book of World Records as the softest mineral on Earth. There are softer things, but they’re not considered minerals.

Some varieties of Pyrophyllite are about the same hardness as talc

[nitpick] It’s Moh’s Scale, not Mohr’s scale. Named after Friedrich Moh.[/nitpick]