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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
Silicates. The silicate mineral class is considered to be the most important of all the mineral classes. About 25% of the known minerals and nearly 40% of the common ones are silicates.he silicate mineral class is considered to be the most important of all the mineral classes. About 25% of the known minerals and nearly 40% of the common ones are silicates.