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In addition, it must be hard and durable. Its value increases if it is also rare.The beauty of a gem is measured in terms of its clarity, brilliance, and color. Comments
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