Pure Metals

The Pure Metals are quest items from The Legend of Zelda: Phantom Hourglass. These types of steel are required for Zauz to forge the Phantom Sword. Interestingly, the three Pure Metals are referred to as "steel", which itself is an alloy of two other metals and not a metal by itself.

Crimsonine
The first Pure Metal, Crimsonine, is found inside the Goron Temple on Goron Island. It is red, like the fire of the Goron Temple.

Azurine
The second Pure Metal, Azurine, is found inside the Temple of Ice on the Isle of Frost. It is as blue as the frozen ice from inside the Temple of Ice. Interestingly there is a form of crystal called Azurite which is similar to Azurine. This is most likely coincidence since the other two pure metals don’t resemble any in earth substances.

Aquanine
The third Pure Metal, Aquanine, is found inside Mutoh's Temple on the Isle of Ruins. It is green like the green ruins of the Isle of Ruins.

Speculation
Some speculate that the three Pure Metals are somehow connected to the three legendary goddesses who created Hyrule; Din, Farore, and Nayru, who are closely related to the colors red, green and blue, respectively &mdash; evoking the colors of the Pure Metals.