Calcium
From Tardis Wiki, the free Doctor Who reference
Calcium was a chemical element. Unlike most other life-forms, the bodies of Raxacoricofallapatorians were calcium-based. (TV: World War Three)
In 1903, after receiving a wealth of information from the future, Grigori Rasputin foresaw, among other things, creatures made of calcium. (AUDIO: The Wanderer)
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