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Tourmaline

The tourmaline gemstone.


  Key words: Gemstone, Mineral, Tourmaline  

  Frequently Asked Questions (FAQ's)  

Question: What is a mineral?
  Answer: A mineral is a naturally occurring inorganic substance. - 253

Question: Where do minerals come from?
  Answer: Most minerals are obtained by mining the ground or extracted from water. - 254

Question: What are nutritional minerals?
  Answer: Nutritional minerals are inorganic elements that are essential to the nutrition of humans, animals, and plants. These minerals are normally obtained by eating natural foods. Examples of nutritional minerals are: calcium, iron, magnesium, zinc, potassium, and sodium. - 255


  External related links to the world ...  

Web Minerals
 Web Minerals

 Mineral database containing 4714 mineral species descriptions and comprehensive picture library of images.

webmineral.com - 641
The mineral and gemstone kingdom
 The mineral and gemstone kingdom

 An interactive reference guide to rocks, minerals, and gemstones.

minerals.net - 642
USGS Mineral Resources
 USGS Mineral Resources

 Do we take minerals for granted? Learn more about selected commodities.

minerals.usgs.gov - 643
Mineralogy database and Mineral collecting
 Mineralogy database and Mineral collecting

 Mineralogy database with information on minerals from around the world and thousands of photos.

mindat.org - 644



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