"Crystalline igneous rock - Rock comprised essentially of interlocking crystals and/or glass. In the Rock Classification Scheme, this class includes normal crystalline igneous rock, and exotic crystalline igneous rock. British Geological Survey Research Report RR/99/06, section 1.3 and fig. 1."@en . . "CIR"@en . "Crystalline igneous rock"@en . "Crystalline igneous rock"@en . . . "stable"@en . . . .