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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
A mineral is a naturally occurring, inorganic solid that has a crystal structure and a definite chemical composition. It must have all five of these characteristics to be a mineral. The mineral cannot form from materials that were once part of a living thing. Minerals are always solid, with a definite volume and shape.