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 flexible sandstone and is a source of diamonds found in the Minas Gerais area.