Answer:
It is sometimes known to have silver linings.
I am the heart that does not beat. If cut, I bleed without blood. I can fly, but have no wings. I can float, but have no fins. I can sing, but have no mouth.
A certain wizard resided in a city made from this gemstone.
Alive without breath, As cold as death, Clad in mail never clinking, Never thirsty, ever drinking
Though blind as well, can lead the blind well.
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