http://inspire.ec.europa.eu/codelist/CommodityCodeValue/slate
2015-08-18 18:07 PM CEST
slate
slate
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. http://minerals.usgs.gov/minerals/pubs/commodity/stone_dimension/myb1-2007-stond.pdf
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. http://minerals.usgs.gov/minerals/pubs/commodity/stone_dimension/myb1-2007-stond.pdf
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