Melts at a very low 231.9°C and often naturally forms discrete nuggets in its matrix.

Requires a massive 1538°C to smelt pure terrestrial ore, forcing early use of meteorites.

Melts at 327.5°C and can be easily smelted in a simple open wood pit fire.

Melts at 1085°C and was historically processed in early kilns without the use of bellows.

Melts at exactly 1064°C, but pure 24-carat is too soft for tools or weapons.

Melts at 660.3°C but could not be processed in antiquity due to lacking modern digesters.