What is one of the better ways to identify most minerals?
a) looking at the colour
b) checking for magnetism
c) determining if it's radioactive
d) using the mohs scale of hardness

The correct option is D.
Checking for the hardness of a mineral by using Mohs scale of hardness is one of the most reliable way of identifying unknown minerals. On this scale, the numbering range from 1 to 10, number one been the softest and number 10 the hardest. Determination of a mineral hardness is a key step in identifying unknown minerals.