The rock that can withstand the highest temperature before melting is tungsten carbide, though it's not technically a "rock" in the traditional sense. It's a ceramic material with an extremely high melting point of 2,870 °C (5,200 °F).

While not naturally occurring like rocks, it's used in various industrial applications due to its incredible heat resistance.

Here are some naturally occurring rocks with exceptionally high melting points:

* Taaffeite: 2,150 °C (3,900 °F)

* Diamond: 3,550 °C (6,420 °F)

* Moissanite: 2,780 °C (5,036 °F)

Keep in mind that these melting points are theoretical values determined under specific conditions. The actual melting point of a rock can vary based on factors like pressure and impurities.