ereyga "plagioclastic" kuma jiro qaamuusyada Ingiriisiga caadiga ah. Si kastaba ha ahaatee, ereyga "plagioclase" waa koox macdan ah oo caadi ah oo ku jirta juqraafiga wuxuuna loola jeedaa taxane macdanta feldspar kuwaas oo sameeya xal adag oo u dhexeeya sodium iyo calcium aluminium silicates. Plagioclase waa macdano muhiim ah oo samaysa dhagaxa waxaana laga heli karaa dhagaxyo badan oo igneous, metamorphic ah, iyo kuwa sedimentary ah.