Examples from the Web for cubical
The ore used is the common sulphuret, with a foliated, glittering and cubical fracture.
It is the sulphuret, of a broad glittering grain, and cubical fracture.
A large, cubical, and windowless building, with the single word food next to each of the sealed entrances.Deathworld|Harry Harrison
Cubical masses of it are found, at some of the diggings, which are studded over with minute crystals of calcareous spar.
The thing's two cubical chambers are one for the transmitting of matter and the other for its reception.Astounding Stories, April, 1931|Various