Which is the softest of quartz, mica or feldspar?
Mohs hardness is generally 2 ~ 3.5, feldspar Mohs hardness is 6 to 6.5, and quartz Mohs hardness is 7. Therefore, the comparison of the three, mica Mohs hardness is minimal, that is, mica is the softest.
Mica is the softest of three minerals, quartz, mica, and feldspar.
