How could you determine the hardness rating for a mineral not listed on the scale?

Moh's Scale of Hardness

# Talk # Gypsum # Calcite # Fluorite

# Apatite

# Orthocalse Feldspar # Quartz # Topaz # Corundum

# Diamond Has only 10 minerals in it. There are literally 100s if minerals to be found in the rocks that are not used in the scale but that can have their hardness related to the scale.

e.g. graphite, galena, beryl, zircon etc.