itacolumiten.
/ɪtəˈkɒljuːmʌɪt/ Mineralogy.
A granular, quartzose, talcomicaceous slate, sometimes flexible in thin slabs.
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the world > the earth > structure of the earth > constituent materials > rock > metamorphic rock > [noun] > slate > others
alum slate1675
peach1778
itacolumite1863
itabirite1868
1863 J. D. Dana Man. Geol. §88. 83 Itacolumite, a schistose quartz rock, consisting of quartz grains with talc or mica.
1868 J. D. Dana Syst. Mineral. (ed. 5) 22 The diamond appears generally to occur in regions that afford a laminated granular quartz rock, called itacolumite, which pertains to the talcose series, and which in thin slabs is more or less flexible.
1878 P. H. Lawrence tr. B. von Cotta Rocks Classified (new ed.) 240 In the Brazils itacolumite forms whole systems of strata of great thickness.
This entry has not yet been fully updated (first published 1900; most recently modified version published online March 2022).
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