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orthoclastic
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 ...
Oxford English Dictionary
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orthotomous
orthotomous, a. Min. (ɔːˈθɒtəməs) [f. as prec. + -ous.] = orthoclastic.1864 Webster cites Dana.
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orthic
orthic, a. Min. (ˈɔːθɪk) [f. Gr. ὀρθ-ός straight + -ic.] Having the cleavage-planes at right angles to one another: = orthoclastic.1877 Le Conte Elem. Geol. (1879) 204 note, In this case syenite would differ from diorite only in the form of the feld⁓spar, which in the former is orthic (orthoclase), ...
Oxford English Dictionary
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plagioclastic
plagioclastic, a. Min. (-ˈklæstɪk) [f. plagio- + Gr. κλαστ-ός broken, cloven + -ic.] Having oblique cleavage. Opp. to orthoclastic.1869 Geikie in Edinb. Geol. Soc. Jrnl. II. 5 Plagioclastic felspars. 1879 Rutley Stud. Rocks x. 91 The plagioclastic..or those in which the cleavage planes intersect at ...
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