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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
Answers to Chapter 2 Review Questions 1. To be considered a mineral, a substance must exhibit the following characteristics: (1) be naturally occurring, (2) be a solid, (3) have an orderly crystalline structure, (4) have a definite chemical composition, and (5) generally be inorganic. 2.