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Germanium was an element on the periodic table.
21st century Earth technology relied on silicon and germanium. (PROSE: GodEngine [+]Loading...["GodEngine (novel)"]
Sunhillowan body chemistry was based upon germanium. (PROSE: Original Sin [+]Loading...["Original Sin (novel)"]
The atmosphere of the gas giant Umbriel (planet) had trace amounts of phosphine, germanium and tetrahydride.