"Quartz-rich-granitic-rock"@en . . "stable"@en . . "QRGNR"@en . "Quartz-rich-granitic-rock - A type of quartz-rich-coarse-grained-crystalline-rock. In the Rock Classification Scheme, it is a collective term for granitic rocks in which quartz comprises more than 60% of the felsic minerals. British Geological Survey Research Report RR/99/06, section 5.1 and figs. 9, 11, 12."@en . . . "Quartz-rich-granitic-rock"@en . .