A mineral can be defined as an inorganic compound that is obtained by digging up the earth crust. It is available in the ore deposits. The physical characteristics and chemical composition of the mineral can be used for the identification of the mineral.
Color, streak, luster and cleavage are physical characteristics of the mineral which can be useful for identification. Streak is a test in which the mineral is scratched to identify it's internal color for identification, luster means how a mineral shows reflection against the light, cleavage is the breaking of the mineral into parts, it tells the internal composition of the mineral.
Color is the least reliable method for identifying a mineral because two or more minerals can have the same color.
In diabetes mellitus, the level of glucose in your blood, also called blood sugar, is too high. Your kidneys try to remove the extra glucose by passing it in your urine. In diabetes insipidus, your blood glucose levels are normal, but your kidneys can't properly concentrate urine.
