Adjective
Pertaining to, or like, a dodecahedion; consisting of twelve equal sides.
Source: Webster's dictionaryHowever, multiple boron atoms reacting with each other have a tendency to form novel dodecahedral (12-sided) and icosahedral (20-sided) structures composed completely of boron atoms, or with varying numbers of carbon heteroatoms. Source: Internet
The other tetrahalides instead have dodecahedral geometry. Source: Internet
The protactinium coordination in all its tetrahalides is 8, but the arrangement is square antiprismatic in protactinium(IV) fluoride and dodecahedral in the chloride and bromide. Source: Internet
Octahedral cleavage (four directions) is present in fluorite and diamond, and sphalerite has six-directional dodecahedral cleavage. Source: Internet