Commodity Code
smokey quartz
http://resource.geosciml.org/classifier/cgi/commodity-code/smokey-quartz
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definition | Smoky quartz is a brown to black variety of quartz |  |
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source | http://en.wikipedia.org/wiki/Smoky_quartz | |
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in scheme | commodity code | |||||
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is primary topic of | smokey quartz& properties=definition | |||||