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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.
There are five characteristics that an Earth material must possess in order to be considered a mineral. Although what the book says is generally correct, I prefer my way of stating these characteristics. Please learn the five characteristics of a mineral as stated below. For any earth material to be considered a mineral, it must exhibit ALL of the following characteristics: a. It must be naturally occurring. b. It must be inorganic (was never alive). c. It must be a solid. d. It must be crystalline; and all samples of the same mineral must have the same crystalline structure. e. It must possess a definite chemical composition; and different samples of the same mineral may vary in chemical composition only within specified narrow limits. Clarification of Terms