Commodity Code
slate
http://resource.geosciml.org/classifier/cgi/commodity-code/slate
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definition | Commercial slate is a microgranular metamorphic rock formed by the recrystallization of clay sediments, such as claystone, shale, or siltstone. Characterized by excellent parallel cleavage, slates may be easily split into relatively thin slabs. |  |
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source | http://minerals.usgs.gov/minerals/pubs/commodity/stone_dimension/myb1-2007-stond.pdf | |
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broader |
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in scheme | commodity code | |||||
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is primary topic of | slate& properties=inScheme | |||||