• Webster's Revised Unabridged Dictionary
    • n Itacolumite (Min) A laminated, granular, siliceous rocks, often occurring in regions where the diamond is found.
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Century Dictionary and Cyclopedia
    • n itacolumite A fine-grained, quartzose, talcomicaceous slate, an important member of the gold-bearing formation of Brazil. In thin slabs it is sometimes more or less flexible.
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Chambers's Twentieth Century Dictionary
    • n Itacolumite it-a-kol′ūm-īt a schistose quartzite, containing scales of mica, talc, and chlorite, often having a certain flexibility.
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Webster's Revised Unabridged Dictionary
From Itacolumi, a mountain of Brazil


In literature:

Itacolumite is yellow or pale-brown, and splits readily into thin flat slabs.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 8" by Various