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The physical characteristics of minerals include traits which are used to identify and describe mineral species. These traits include color, streak, luster, density, hardness, cleavage, fracture, tenacity, and crystal habit.
Mineral hardness is one of the most useful mineral characteristics which, once you get used to it, is quite easy to measure. It refers to the mineral's resistance to being scratched-not its resistance to being broken. Experienced geologists use a scraper which gives them quite a good idea of a mineral's hardness.