Tetradecahedral

The Selenitæ of this Genus conſiſt each of ſix ſides, that is, a top and bottom, and four Trapezia; but want the Rhombic ends which make the others decahedral or tetradecahedral;[…].

The cryſtals are ſometimes irregular, but frequently aſſume rhomboidal, tetradecahedral, and almoſt all other regular forms.

Methane forms a structure I hydrate with two dodecahedral (12 vertices, thus 12 water molecules) and six tetradecahedral (14 water molecules) water cages per unit cell;[…].