Mohr's scale..Mineral softer than talc.

Factual Questions
#1

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

#2

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.

#3

Some varieties of Pyrophyllite are about the same hardness as talc

#4

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