SKKH+4.3

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Vocabulary
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 * gemstone** - a hard colorful mineral that has brilliant or glassy luster
 * ore**-rock that contains a metale or economically useful mineral
 * smelting**s - the procces by which ore is melted to seperate the useful metals from other elements
 * alloy** - a solid mixture of two o more metals.

The Uses of Minerals

 * Minerals are a source of metals, gemstones, and other materials used to make many products.
 * **Gemstones**
 * Gemstones are hard colorful minerals that have brillant or glassy lusters**.**
 * **Metals**
 * Metals are useful minerals that could be streatched into wire, flattened into sheets and hamered or molded without breaking.
 * **Other Useful Minerals**
 * Other useful minerals include Quartz, Fluorite, Calcite Kaolin and Gypsum.Quartz can be used in making glass and other electronic equipment and watches. Optical instruments can be made using the clear crystals in the mineral calcite.



Ores

 * Ores are rocks containing metal or economically useful mineral.

Mining

 * There are three types of mines. They are open pit mies, shaft mines and strip mines.