Commodity Code
chalcedony
http://resource.geosciml.org/classifier/cgi/commodity-code/chalcedony
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definition | Chalcedony is a cryptocrystalline form of silica, composed of very fine intergrowths of the minerals quartz and moganite. |  |
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source | http://en.wikipedia.org/wiki/Chalcedony | |
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in scheme | commodity code | |||||||||||||
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is primary topic of | chalcedony& properties=definition | |||||||||||||