which mineral property is the least useful for identifying minerals and why? which mineral property is the least useful for identifying minerals and why? density is the least useful property for identification because different specimens of the same type of mineral can vary in size. color is the least useful property for identification because it is the most obvious property. color is the least useful property for identification because the same mineral type can be found in several different colors as a result of impurities in the mineral. streak is the least useful property for identification because it does not work for minerals with metallic lusters. streak is the least useful property for identification because the same mineral type can be found with several different colors of streak caused by impurities in the mineral.