peliticadj.
/pᵻˈlɪtɪk/, U.S. /pəˈlɪdɪk/ Geology.
Relating to, of the nature of, or derived from pelite; lutaceous.
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the world > the earth > structure of the earth > constituent materials > rock > sedimentary rock > [adjective] > other argillaceous
pelitic1879
lutaceous1904
1879 F. Rutley Study of Rocks xiv. 299 The clastic rocks..he divides into the psephitic, the psammitic, and the pelitic.
1919 A. Harker Petrol. (ed. 5) xxii. 272 We have pelitic gneisses, differing from the psammitic in being less siliceous and more micaceous.
1954 C. E. Tilley et al. Harker's Petrol. (ed. 8) xxii. 258 Quartz is, of course, less abundant in pelitic, than in psammitic schists.
2002 Mining Jrnl. (Nexis) 8 Mar. (Suppl.) 7 The largely buried Sask Craton comprises ca. 3.0 Ga granitoid and pelitic gneisses, and a 2.45 Ga tholeiitic intrusive suite.
This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022).
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adj.1879