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