orthoclasticadj.

Brit.

/ˌɔːθə(ʊ)ˈklastɪk/, U.S.

/ˌɔrθoʊˈklæstɪk/

Origin: Formed within English, by compounding. Etymons: ortho- comb. form, -clastic comb. form.

Etymology: < ortho- comb. form + -clastic comb. form, after orthoclase n.

Mineralogy. Now rare.

Chiefly of feldspar: having cleavages at right angles. Cf. orthoclase n., plagioclastic adj.

ΘΚΠ

the world > the earth > minerals > mineral structure or appearance > [adjective] > cleavage or fracture > having cleavage at particular angles

paratomous1825

orthotomous1861

orthoclastic1866

orthic1877

1866 P. H. Lawrence tr. B. von Cotta Rocks Classified 8 We distinguish two principal kinds of felspar, the orthoclastic (monoclinic)..and the plagioclastic (triclinic).

1869 Prelim. Rep. U.S. Geol. Surv. Colorado & New Mexico 107 Pegmatolite.—Flesh-red, orthoclastic, abundant as pebbles, scattered with quartz over the prairies for hundreds of miles.

1897 Amer. Naturalist 31 53 The predominance of plagioclase phenocrysts over orthoclastic ones.

1939 W. Huebner Geol. & Allied Sci. I. 244 Orthoklastisch, orthoclastic.

This entry has been updated (OED Third Edition, September 2004; most recently modified version published online March 2022).

单词	orthoclastic
释义	orthoclasticadj. Brit. /ˌɔːθə(ʊ)ˈklastɪk/, U.S. /ˌɔrθoʊˈklæstɪk/ Origin: Formed within English, by compounding. Etymons: ortho- comb. form, -clastic comb. form. Etymology: < ortho- comb. form + -clastic comb. form, after orthoclase n. Mineralogy. Now rare. Chiefly of feldspar: having cleavages at right angles. Cf. orthoclase n., plagioclastic adj. ΘΚΠ the world > the earth > minerals > mineral structure or appearance > [adjective] > cleavage or fracture > having cleavage at particular angles paratomous1825 orthotomous1861 orthoclastic1866 orthic1877 1866 P. H. Lawrence tr. B. von Cotta Rocks Classified 8 We distinguish two principal kinds of felspar, the orthoclastic (monoclinic)..and the plagioclastic (triclinic). 1869 Prelim. Rep. U.S. Geol. Surv. Colorado & New Mexico 107 Pegmatolite.—Flesh-red, orthoclastic, abundant as pebbles, scattered with quartz over the prairies for hundreds of miles. 1897 Amer. Naturalist 31 53 The predominance of plagioclase phenocrysts over orthoclastic ones. 1939 W. Huebner Geol. & Allied Sci. I. 244 Orthoklastisch, orthoclastic. This entry has been updated (OED Third Edition, September 2004; most recently modified version published online March 2022). < adj.1866
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