"Igneous rock in which the framework of the rock consists of crystals that are too small to determine mineralogy with the unaided eye; framework may include up to 50 percent glass. A significant percentage of the rock by volume may be phenocrysts. Includes rocks that are generally called volcanic rocks."@en . . . "http://inspire.ec.europa.eu/codelist/LithologyValue/fineGrainedIgneousRock"^^ . . . . . . . "fine grained igneous rock"@en . "2015-08-18 18:02 PM CEST"^^ . . "Igneous rock in which the framework of the rock consists of crystals that are too small to determine mineralogy with the unaided eye; framework may include up to 50 percent glass. A significant percentage of the rock by volume may be phenocrysts. Includes rocks that are generally called volcanic rocks."@en . . . "fine grained igneous rock"@en . . . . . . . . .