diplohedronn.
/dɪpləʊˈhiːdrən/ Crystallography.
A crystalline form contained by twenty-four trapezoidal planes with two sides equal; a dyakis-dodecahedron.
ΚΠ
1878 P. H. Lawrence tr. B. von Cotta Rocks Classified (new ed.) 211 The large diplohedrons of quartz are very much rounded off.
1895 N. 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.
1895 N. Story-Maskelyne Crystallogr. 217 Other diplohedra are met with on crystals of pyrites, and occur also on those of hauerite and cobaltine.
Derivatives
diploˈhedral adj. of the nature of a diplohedron.
ΚΠ
1878 H. P. Gurney Crystallogr. 54 A diplohedral form is one in which each normal bears two parallel faces, one at each end.
1895 N. Story-Maskelyne Crystallogr. 207 Hemisystematic diplohedral forms; hemi-tesseral diplohedra.
This entry has not yet been fully updated (first published 1896; most recently modified version published online March 2021).
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