† di-hexaˈhedral, a. Cryst. Obs.
[f. as next + -al1.]
Having twice six faces: see quot.
| 1805–17 R. Jameson Char. Min. (ed. 3) 203 Di-hexahedral (di-hexaèdre), when it is a six-sided prism, having three planes on the extremities. [204] Example, Di-hexahedral felspar (feldspath di-hexaèdre), which is a broad six-sided prism, bevelled on the extremities, the bevelling planes set on two opposite lateral edges, and on each of the extremities, one of the angles, formed by the meeting of the bevelling planes with the lateral edges, and on which they are set, truncated. |