Hardness is better.
You are testing the relative hardness of the mineral.
the color of a mineral specimen can vary, depending on many variables. however, other properties of identifying a mineral are more trustworthy and stable.
mineral content
Tenacity, Density, Color, Streak, Luster, Magnetism, and Hardness
hardness, luster, cleavage and fracture, color (not quite useful) and streak
The properties in identifying minerals are color,luster,hardness,cleavage and fracture,and streak.
Hardness test based on the Mohs Scale of relative mineral hardness, specific gravity, streak test for mineral color, classification of mineral crystal system, chemical analysis.
only certain minerals display magnetism
Hardness is the ability of a mineral to resist being scratched. A diamond is the hardest mineral--which means that no other mineral can scratch it.
Hardness is the ability of a mineral to resist being scratched. A diamond is the hardest mineral--which means that no other mineral can scratch it.
Hardness measures a mineral's resistance to being scratched.
Hardness
Luster is not a good property for identifying minerals because many minerals look similar. Your best way of knowing which mineral is which is by measuring their hardness.
hardness
Hardness measures a mineral's resistance to being scratched.
You are testing the relative hardness of the mineral.
Magnetism involves iron.