Ma'anar ƙamus na dutsen ƙamus wani nau'in dutse ne da ke samuwa ta hanyar ƙarfafawa da sanyaya narkakkar magma ko lava. Wannan tsari zai iya faruwa duka a ƙarƙashin ƙasan duniya (dutse mai banƙyama) da kuma saman (dutse mai banƙyama). Duwatsu masu banƙyama galibi ana siffanta su da nau'in lu'u-lu'u kuma suna iya kewayawa cikin abun da ke ciki daga felsic (mai arzikin silica) zuwa mafic (mai arzikin magnesium da baƙin ƙarfe). Misalan duwatsu masu ƙyalli sun haɗa da granite, basalt, da pumice.