http://resource.geosciml.org/classifier/cgi/commodity-code/tourmaline
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definition | Tourmaline is a crystal boron silicate mineral compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium. Tourmaline is classified as a semi-precious stone and the gemstone comes in a wide variety of colors. | ![]() |
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source | http://en.wikipedia.org/wiki/Tourmaline | ![]() |
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in scheme | commodity code | |||||
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is primary topic of | tourmaline& properties=type,isPrimaryTopicOf |