from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A variety of sandstone that is flexible when cut into thin slabs.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A porous yellow sandstone that is flexible when cut into thin strips.
from the GNU version of the Collaborative International Dictionary of English
- n. A laminated, granular, siliceous rocks, often occurring in regions where the diamond is found.
from The Century Dictionary and Cyclopedia
- n. 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.
After Itacolumi (Itacolomi), a mountain of east-central Brazil.(American Heritage® Dictionary of the English Language, Fourth Edition)
Itacolumi + -ite (Wiktionary)