Gallium
From Tardis Wiki, the free Doctor Who reference
Gallium was an element on the periodic table.
Mars was abundant with gallium, deuterium, palladium, and silver. (PROSE: Beige Planet Mars)
The Seventh Doctor believed creating trees that could grow on asteroids was simple enough if one used gallium arsenic solar cell leaves driving the pico-electric systolic pumping system and an atavistic silicon outer shell. (PROSE: The Also People)
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