"a mutable substance"
"the mutable ways of fortune"
"mutable weather patterns"
"a mutable foreign policy"

"changeable behavior"
"changeable moods"
"changeable prices"

"a changeable climate"
"the weather is uncertain"
"unsettled weather with rain and hail and sunshine coming one right after the other"

"changeable taffeta"
"chatoyant (or shot) silk"
"a dragonfly hovered, vibrating and iridescent"