unmicaceousadj.
/(ˌ)ʌnmʌɪˈkeɪʃəs/, U.S. /ˌənˌmaɪˈkeɪʃəs/ Geology. Now rare.
Not micaceous.
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the world > the earth > minerals > mineral sources > [adjective] > yielding a mineral or metal > mica > not
unmicaceous1829
the world > the earth > minerals > types of mineral > silicates > phyllosilicate > [adjective] > mica > not
unmicaceous1829
1829 Trans. Geol. Soc. 2nd Ser. 3 16 This conclusion will hardly apply to the unmicaceous slate rocks.
1952 Ann. Brit. School Athens 47 4 The clay of the Eretrian examples is distinctly unmicaceous.
2011 Earth-Sci. Rev. 106 281/2 The unmicaceous Chogdo Formation Tar Group.
This entry has been updated (OED Third Edition, December 2014; most recently modified version published online March 2022).
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adj.1829