Itacolumite

The rock Itakolumit is a special, rare variety of quartzite, a pressurized and temperature exposure converted metamorphic sandstone. The binder which holds the individual quartz grains, consisting of different layered silicates, mainly talc or chlorites, occasionally sericite. In some varieties, the physical properties of talc platelets ( low hardness, easy displaceability ) require a flexibility in the rock thin plates ( flexible or elastic sandstone, also called joint quartz). As the content of phyllosilicates and decreasing quartz content of the Itakolumit shows transitions to chlorite, talc and mica schist.

Itakolumit can be found as a member of the Huron ( Slate ) formation, especially in Brazil, where he composed in Minas Gerais and Goiás high mountains and the eponymous mountain Itacolomi ( in the Serra do Espinhaço ). In addition to its essential Gemengteilen the rock here leads gold, crude and disseminated, accompanied by pyrite and arsenopyrite, hematite, magnetite, tourmaline, micas; it is occasionally traversed by quartz veins, and the talc - chlorite schist and occur -shaped storage therein. In Brazil, the Itakolumit is also host rock of diamonds. Otherwise, we find the Itakolumit in North and South Carolina ( Sauratown Mountains ), in the Urals and in Portugal.