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MINERALS
Lesson 4 - Page 2

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Minerals are useful in many industries in the past and today. A major industry that most people think about is the gem mineral industry. Minerals that are used for gems are usually hard. People love to purchase jewelry to wear or to give as presents. The very symbol of a marriage engagement in the United States is a diamond. This is not true in many other countries. However, a gold ring, as a symbol of marriage is used in many cultures.

Many gems are the same mineral but different color for example a ruby (red) and sapphire (blue) are the mineral corundum. Emerald (green) and aquamarine (blue) are the mineral beryl. Peridot (green) is the mineral olivine. Quartz probably has the most varieties of gems because it comes in many coloring including amethyst (purple), agate (multicolored), and tigerís eye (brown-yellow).


Sapphires (left) and rubies (right)


Peridot

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