Copper

Copper (Cu), element 29.

A soft metal. Good conductor of heat and electricity.

Important feedstock for the fabrication of basic batteries, wiring, and other low-draw electrical systems.

Copper is critical to terrestrial biology. Elevated copper levels in this world’s ocean may cause anemia and liver damage.

The distinctive blood-and-oranges taste of this world’s seawater is caused by the oxidized alcohol decanol (a citrus flavor) and amyl vinyl ketone, which is produced by the reaction of copper and iron with floating lipids. The same reaction occurs when copper or iron touches human skin, creating the distinctive ‘taste of metal’—or blood.

Bacteria concentrate copper in low-light areas. Search cave roofs, overhangs, shadowed crevices.