Among the common properties used are: Habit - shape Color Streak (color of fine powder of the mineral) Luster -- metallic, vitreous, pearly, resinous (reflection of light) Cleavage (planes along which the mineral breaks easily) Density (mass/volume) Hardness : based on Mohs hardness scale as follows: Talc gypsum (fingernail) calcite (penny) fluorite apatite (knife blade) orthoclase (glass) quartz topaz corundum Diamond Formation of Minerals Minerals are formed in nature by a variety of processes.
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L:Cleavage (planes