Geologist perform a hardness test using their fingernail, a penny, and a paper clip.
Hardness
Color, lustre, hardness, streak
The Mohs scale uses the hardness of minerals to classify them from 1 to 10. It was named after the German geologist Carl Friedrich Christian Mohs.
You can test its hardness on other minerals to find it hardness. It can help classify it better.
The big two are the Rockwell and Mohs Scales.
Some minerals have varying hardness according to the direction you may scratch
Relative hardness is the property of minerals that uses the Mohs scale for classification.
The Mohs scale is used to determine the relative hardness of minerals.
By there color, hardness, density, luster, streak, plus crystalshare
Yes
yes
hardness define minerals