covellite /kō-velˈīt or kōˈvə-līt/

A blue mineral, cupric sulphide

• swan-mussel
• swan-mussels
• swan neck
• swan necks
• swanned
• swanneries
• swannery
• swannier
• swanniest
• swanning
• swannings
• swanny
• swan off
• swans
• swans-down
• swansdown
• swan-shot
• swan-shots
• swan-skin
• swanskin
• swanskins
• swan song
• swansong
• swan songs
• swansongs