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(possibly dated) A micaceous iron ore, related to itabirite and associated with gold.
1911, Economic Geology, page 681:
ORIGIN OF THE ORES. Massive Ores and Jacutinga. - Itabirite and bedded ore were formed together under similar conditions, and statements regarding the origin of one apply to the other.[…] Fragmental Ores […] are due to the surface weathering and erosion of the massive ores, jacutinga and itabirite above described.
1914, Transactions of the Institution of Mining & Metallurgy, page 26:
... jacutinga, itabirite, quartzite, and dolomite, as of secondary origin, formed by a relatively deep-extending series of surface chemical processes, justifying, in his opinion, the use of the term 'digestive.' Mr. Goodchild[…]
1916, Franz Beyschlag, Johan Herman Lie Vogt, Paul Krusch, The Deposits of the Useful Minerals & Rocks, page 619:
... Itabirite. Auriferous Jacutinga in Itabirite. Limestone. Canga or Ferruginous Conglomerate. FIG. 321. - Section through the Gongo Socco mountains. [M]asses of gold mixed with jacutinga have been found weighing several kilogrammes[…]
1963, John Van Nostrand Dorr, Aluizio Licinio de Miranda Barbosa, Geology and Ore Deposits of the Itabira District, Minas Gerais, Brazil, page 104:
The early literature used the term "jacutinga" for both soft ore and soft itabirite. Hussak (1908) states: "The fragments of jacutinga, rich in gold, from Gongo Socco and Machuiné, examined by me, were formed of schistose hematite, containing very little pyrolusite, earthy limonite, some scales of talc, and certain masses which had the appearance of kaolinite." Bensusan (1929) who has worked more extensively with "jacutinga" gold ore than other modern authors, defines jacutinga as "a sandy micaceous iron ore, and the constitutes are micaceous iron schist and fiable quartz, oxide of manganese, and fragments of talc."
1966, U.S. Geological Survey Professional Paper, page 45:
[…] itabirite, because he noted that "jacutinga" was the most important host rock for gold mineralization, whereas itabirite was an unfavorable host rock.
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