Itabirite

Itabirite, also known as banded-quartz hematite and hematite schist, is a laminated, metamorphosed oxide-facies iron formation in which the original chert or jasper bands have been recrystallized into megascopically distinguishable grains of quartz and the iron is present as thin layers of hematite, magnetite, or martite (pseudomorphs of hematite after magnetite).^[1]

The term was originally applied in Itabirito (Pico de Itabirito), in the state of Minas Gerais and southern part of Belo Horizonte, Brazil, to a high-grade, massive specular hematite ore (66% iron) associated with a schistose rock composed of granular quartz and scaly hematite. The term is now widely used outside Brazil.^[2]

References

1. ↑ http://www.arizonagoldprospectors.com/Mining_Dictionary/index.html US Bureau of Mines Dictionary of Mining, Mineral, and Related Terms. Accessed 12 December 2010
2. ↑ Carlos Alberto Rosière et al.: Itabira Peak, State of Minas Gerais. Geographic, historical and structural landmark of the Quadrilátero Ferrífero. In: Sítios Geológicos e Paleontológicos do Brasil (SIGEP) 042, 2005