How Will You Describe Quartz?
Quartz, the commonest of all minerals, is made of silica. It is found in most kinds of rocks in colorless, often transparent form. There are also colored varieties...
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What Gives Opals Their Colors?
What Gives Opals Their Colors? The beautiful flashes of color given off by a precious opal as it is turned and viewed from different angles are caused by the various...
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