psilomelane /sī-lomˈə-lān, sī-lō-melˈān or psī-/

An oxide of manganese, usu with barium, etc, occurring in smooth black botryoidal masses

• taxies
• taxiing
• taximan
• taximen
• taximeter
• taximeters
• taxing
• taxing master
• taxing masters
• taxings
• taxi rank
• taxi ranks
• taxis
• taxi stand
• taxi stands
• taxi track
• taxi tracks
• taxiway
• taxiways
• taxless
• tax loss
• tax losses
• taxman
• taxmen
• Taxodium