Tourmaline

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"Tourmaline." 30 August 2007. HowStuffWorks.com. <http://reference.howstuffworks.com/tourmaline-encyclopedia.htm> 24 July 2008.

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Tourmaline, TUR muh lihn or TUR muh leen, is any of a group of boron-containing minerals often found in granite. Tourmalines are used as gemstones and for industrial purposes.

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Sardonyx, SAHR duh nihks or sahr DON ihks, is a variety of chalcedony, a fine-grained form of the mineral quartz. Most sardonyx has straight or… See more »

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Emerald is a rich green gemstone that is a variety of the mineral beryl. It owes its color to minute amounts of chromium in the crystals. Pure… See more »

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Tourmaline

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