"stable"@en . . . . "MCFDSY"@en . "Foid-microsyenite - A type of foid-microsyenitic-rock. In the Rock Classification Scheme, it is the medium-grained equivalent of foid-syenite. British Geological Survey Research Report RR/99/06, section 5.1."@en . . "Foid-microsyenite"@en . "Foid-microsyenite"@en . .