diplohedron Cryst.
(dɪpləʊˈhiːdrən)
[f. diplo- + Gr. ἕδρα seat, base: cf. trihedron.]
A crystalline form contained by twenty-four trapezoidal planes with two sides equal; a dyakis-dodecahedron.
| 1878 Lawrence Cotta's Rocks Class. 211 The large diplohedrons of quartz are very much rounded off. 1895 Story-Maskelyne Crystallogr. 216 The terms dyakis-dodecahedron and diplohedron have been employed to convey the idea of the form [twenty-four-trapezohedron] being a doubled or broken-faced pentagon-dodecahedron. Ibid. 217 Other diplohedra are met with on crystals of pyrites, and occur also on those of hauerite and cobaltine. |
Hence diploˈhedral a., of the nature of a diplohedron.
| 1878 Gurney Crystallogr. 54 A diplohedral form is one in which each normal bears two parallel faces, one at each end. 1895 Story-Maskelyne Crystallogr. 207 Hemisystematic diplohedral forms; hemi-tesseral diplohedra. |