orthoclastic, a. Min.
(ɔːθəʊˈklæstɪk)
[f. ortho- + Gr. κλαστ-ός broken, cloven + -ic.]
Having cleavages at right angles to each other.
| 1878 Lawrence tr. Cotta's Rocks Class. 8 We distinguish two principal kinds of felspar, the orthoclastic (monoclinic)..and the plagioclastic (triclinic). 1879 Rutley Stud. Rocks x. 91 The orthoclastic (rectangular cleavage) or that in which the chief cleavages are mutually situated at right angles. |