. "Igneous material with more than 63 percent SiO2."@en . . . "acidic igneous material"@en . "Igneous material with more than 63 percent SiO2."@en . . "acidic igneous material"@en . . . . . . "http://inspire.ec.europa.eu/codelist/LithologyValue/acidicIgneousMaterial"^^ . . . . . . "2015-08-18 17:31 PM CEST"^^ .