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Semiconductor diodes are made from the same Silicon, and occasionally Germanium, material that transistors, integrated circuits, etc. are made from.

Diodes used in early electronic devices were made from vacuum tubes.

Somewhat later diodes were made from finned stacks of Selenium.

Simple "Crystal Radios" use Galena (lead ore) crystals with a steel pin that is manipulated to find a spot that allows electrical current to flow in only one direction.

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