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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
Mineral Properties. A mineral is a naturally-occurring, inorganic solid which possesses a characteristic internal atomic structure and a definite chemical composition. If we take the definition of a mineral term by term, it becomes easier to understand: Substances that have these features will also have distinctive physical properties such as color, crystal form, cleavage, luster, streak, etc. You can find out more about minerals by clicking on the buttons on the right.