It melts at 3727 C. The stable form of carbon at room temperature is Graphite which has a hexagonal crystal structure. (Top diagram) Diamond is metastable at room temperature and has a diamond cubic ...

It melts at 1410 C. The electronic configuration of the silicon atom is: (Ne)(3s) 2 (3p) 2, and the atomic radius is 0.132 nm. Silicon has the diamond cubic crystal structure with a lattice parameter ...

The resulting diamond has a hexagonal lattice crystal structure, rather than the normal cubic structure. Hexagonal diamond (or lonsdaleite) was first brought to the attention of scientists more ...

It is significantly 40% harder than natural diamonds, which typically have a cubic crystal structure. The material has been historically rare, found only in impact craters from meteorite collisions.