Question

how to test hardness of minerals
hit with hammer
expose in uv light
heat with furnace
scratch with nail

Answer 1

Answer:

The Correct Answer is Scratch with Nail

Explanation:

A mineral's Mohs hardness is measured by observing if its surface is scratched by a material with a known or defined hardness. Minerals are rated along the Mohs scale, which is made up of 10 minerals with arbitrary hardness values, to assign numerical values to this physical feature.