
1) Sedimentary rock
Found on
https://www.crosswordclues.com/clue/itacolumite

Itacolumite is a naturally occurring porous, yellow sandstone that is flexible when cut into thin strips. It occurs in great numbers at Itacolumi, in the southern portion of Minas Gerais, Brazil. It is also found in Jhajjar, India; Georgia; and Stokes and McDowell Counties North Carolina, USA. It is the best and most widely known example of a flex...
Found on
http://en.wikipedia.org/wiki/Itacolumite

• (n.) A laminated, granular, siliceous rocks, often occurring in regions where the diamond is found.
Found on
http://thinkexist.com/dictionary/meaning/itacolumite/
It`a·col'u·mite noun [ From
Itacolumi , a mountain of Brazil.]
(Min.) A laminated, granular, siliceous rocks, often occurring in regions where the diamond is found.
Found on
http://www.encyclo.co.uk/webster/I/104

Itacolumite is a laminated, light-coloured, granular, siliceous rock, consisting of fine quartz grains, and flakes of mica, talc, and chlorite, often occurring in regions where gold and diamonds are found.
Found on
http://www.probertencyclopaedia.com/browse/HI.HTM

a sandstone consisting of interlocking quartz grains and mica scales, found principally in Brazil and North Carolina, and noted for its flexibility in thin slabs.
Found on
https://www.infoplease.com/dictionary/itacolumite
No exact match found.