http://resource.geosciml.org/classifier/cgi/commodity-code/basalt
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| definition | Commercial basalt and traprock includes igneous rocks that are too fine grained to be termed “black granite.” This category includes extrusive igneous rocks, such as andesite, basalt, or dacite, and intrusive igneous rocks, such as amphibolites, diabase, diorites, fine-grained gabbros, peridotites and pyroxenites. | ||||||
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| source | http://minerals.usgs.gov/minerals/pubs/commodity/stone_dimension/myb1-2007-stond.pdf | ||||||
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