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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
The properties of minerals include crystal shape (habit), luster, color, streak, tenacity, hardness, cleavage, fracture, and density or specific gravity. in addition, a number of special physical and chemical properties (taste, smell, eleasticity, feel, magnetism, double refraction, and chemical reaction to hydrochloric acid) are useful in identifying certain minerals. each mineral has a unique set of properties that can be used for identification