itacolumite - Definition. Was ist itacolumite
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Was (wer) ist itacolumite - definition

POROUS, YELLOW SANDSTONE THAT IS FLEXIBLE WHEN CUT INTO THIN STRIPS
Bending rock
  • Itacolumite

Itacolumite         
·noun A laminated, granular, siliceous rocks, often occurring in regions where the diamond is found.
Itacolumite         
Itacolumite is a naturally occurring porous, yellow sandstone that is flexible when cut into relatively thin slabs. It occurs at Itacolumi, its eponym, in the southern portion of Minas Gerais, Brazil.

Wikipedia

Itacolumite

Itacolumite is a naturally occurring porous, yellow sandstone that is flexible when cut into relatively thin slabs. It occurs at Itacolumi, its eponym, in the southern portion of Minas Gerais, Brazil. It is also found in Kaliana village (Charkhi Dadri district, Haryana, India), Georgia in the US, and Stokes and McDowell counties of North Carolina. 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 of Brazil.

On the split faces of the slabs, scales of greenish mica are visible, but in other respects, the rock seems to be a remarkably pure specimen consisting of quartz. If a slab measuring 30-60 centimetres long and few centimetres thick is cut and then placed so that it is supported at its ends only, it will gradually bend due to its own weight. If it is then turned over it will straighten and bend in the opposite direction. Flakes a millimetre or two thick can be bent between the fingers and are said to give out a creaking sound, but specimens showing this property form only a small part of the whole mass of the rock.