Name       : Terbium
Symbol     : Tb
Atomic #   : 65
Atom weight: 158.925
Melting P. : 1356
Boiling P. : 3230
Oxidation  : +3
Pronounced : TUR-bi-em
From       : 
Identified : Gustaf Mosadner in 1843
Appearance : Soft, ductile, silvery-gray, rare-earth metal
Note       : Used in modest amounts in special lasers and solid-state
             devices
             
[Properties]

  Terbium is a soft, silvery metal. It feels something like lead, but looks
a bit more like aluminum. It is a lot heavier than either of those familiar
elements, though. Terbium is a member of the lanthanide series, from
lanthanum (element 57) through lutetium (element 71).
  The element has two, temperature-dependent crystal forms, or allotropes.
The alpha form is the one that exists at room temperature - up to 1298
degrees. The beta form from prevails above that temperature.