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Gems Are Not Just for Jewelry

4/21/2020

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When I think of gems, I immediately think "jewelry." But gems are used in many other ways. In fact, the majority of gems that are mined are used in applications other than jewelry. Here are just a few.
Corundum is aluminum oxide. It is called ruby when red and sapphire when other colors. Regardless of color, corundum is used as an abrasive for grinding glass and polishing metal. It is made into sandpapers and grinding wheels.
Fluorite is calcium fluoride. It is used as flux in the manufacture of steel and as a catalyst in the manufacture of high-octane fuels. Fluorite plays a large part in the creation of glazed tiles and opalescent glass. It is a source of fluorine which is used for the fluoridation of water and in Teflon coatings.

​Hematite is an iron oxide and the most important iron ore as it is 70% iron. Powdered hematite is called red ocher and is used as a pigment. Purified, ground hematite is called rouge and is used to polish plate glass and jewelry.
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Fluorite
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Kyanite
Kyanite is the major raw material for the aluminum silicate mullite which is used in spark plugs and heat-resistant porcelains. The molds that are used for casting high-temperature metals are often made of kyanite.

​Lazurite is the main component of lapis lazuli and gives it its deep blue color. Powered lapis was used for hundreds of years to make the pigment ultramarine. And, it was probably one of the first eye shadows.
Malachite is green copper carbonate hydroxide. It was ground and used as eye paint in ancient time possibly to ward off the evil eye. It was also used as the green pigment in wall paintings dating back to the 15th century BC.

​Petalite, lithium aluminum silicate, is an important source of lithium. Its high chemical activity makes possible the tiny batteries used in pacemakers and other small devices.
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Petalite
Jewelry Facets provides more information about these and other gemstones.
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