Which Rock Has the Highest Melting Point?

Quartz has the highest melting point of the individual minerals in Bowen's Reaction Series but it crystallizes at the lowest temperature from a magma.

What is the hardest rock to melt?

Restite is the residual material left at the site of melting during the in place production of granite through intense metamorphism. Generally, restite is composed of a predominance of mafic minerals because these are harder to melt (see Bowen's reaction series).

What material has the highest melting point?

The chemical element with the highest melting point is tungsten, at 3,414 °C (6,177 °F; 3,687 K); this property makes tungsten excellent for use as electrical filaments in incandescent lamps.