hexagonal graphite

The thermodynamically stable form of graphite with an ABAB stacking sequence of the graphene layers. The exact crystallographic description of this allotropic form is given by the space group d6h4 - P63/mmc (unit cell constants: a = 245.6 pm, c = 670.8 pm). Hexagonal graphite is thermodynamically stable below approximately 2600 K and 6 GPa.
The use of the term @G02684@ instead of the more exact term hexagonal @G02684@ may be tolerated in view of the minor importance of @R05385@, the other allotropic form.
PAC, 1995, 67, 473. 'Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)' on page 494 (https://doi.org/10.1351/pac199567030473)