International Geologiical Congress - Oslo 2008

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MPM-01 General contributions to mineralogy

 

Type mineralogy of Brazil: An updating

 

Daniel Atencio, Instituto de Geociências -Univ. São Paulo (Brazil)
 

 

Only 50 minerals are considered valid type species first described from Brazil, 20 of these published before 1959, when the CNMMN (today CNMNC) - IMA was established: chrysoberyl, euclase, palladium, joseite, goyazite, derbylite, tripuhyite, senaite, florencite-(Ce), gorceixite, brazilianite, souzalite, scorzalite, frondelite, faheyite, moraesite, barbosalite, tavorite, arsenopalladinite, and uranmicrolite. From 1959 to 2000, 19 approved Brazilian mineral species remain valid: tantalaeschynite-(Y), atheneite, isomertieite, bahianite, whiteite-(CaFeMg), whiteite-(MnFeMg), palladseite, bariomicrolite, lanthanite-(Nd), minasgeraisite-(Y), parabariomicrolite, lanthanite-(La), zanazziite, arupite, yanomamite, quintinite-2H, serrabrancaite, fluornatromicrolite, and dukeite. The complete description of fluornatromicrolite was never published. The number of type minerals from Brazil approved in the last five years (2003 to 2007) greatly increased: 11 (2.2 per year) against 19 from 1959 to 2002 (0.43 per year). The first is coutinhoite, IMA number 2003-025, ThxBa(1-2x)(H2O)y(UO2)2Si5O13.H2O, with 0≤x≤0,5 e 0≤y≤(2+x), orthorhombic, from the Urucum granite pegmatite, Galiléia, Minas Gerais. The second is lindbergite (2003-029), Mn(C2O4)•2H2O, monoclinic, from the Boca Rica granite pegmatite, Galiléia, Minas Gerais. Oxykinoshitalite (2004-013), Ba(Mg2Ti4+)(Si2Al2)O10O2, monoclinic, was described in the olivine nephelinite of the Fernando de Noronha island, Pernambuco. Atencioite (2004-041), Ca2Fe2+Mg2Fe2+2Be4(PO4)6(OH)4•6H2O, triclinic, was identified in a granite pegmatite from Linópolis, Divino das Laranjeiras, Minas Gerais. Kalungaite (2004-047), PdAsSe, cubic, is a new mineral from Buraco do Ouro mine, Cavalcante, Goiás. Matioliite (2005-011), NaMgAl5(PO4)4(OH)6•2H2O, monoclinic, was identified in the Gentil mine granite pegmatite, Mendes Pimentel, Minas Gerais. Menezesite (2005-023), Ba2MgZr4(BaNb12O42).8H2O, cubic, occurs in the dolomite carbonatite of Cajati, São Paulo. Arrojadite-(PbFe) (2005-056), PbFe2+Na2Ca(Fe2+,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2, monoclinic, occurs in the Sapucaia (Proberil) granite pegmatite, Galiléia, Minas Gerais. The Brazilian type mineral arrojadite became a group of minerals in 2005. Ruifrancoite (2005-061), Ca22(Fe3+2MnMg)=4Be4(PO4)6(OH)4•6H2O, monoclinic, also occurs in the Sapucaia (Proberil) granite pegmatite. Guimarãesite (2006-028), Ca2Zn5Be4(PO4)6(OH)4•6H2O, monoclinic, occurs in the granite pegmatite near the Piauí river, Itinga, Minas Gerais. Bendadaite (98-053a, co-type, approved in 2007), Fe2+Fe3+2(AsO4)2(OH)2•4H2O, monoclinic, is from Almerindo quarry, Divino das Laranjeiras, Minas Gerais. Recently the doubtful mineral giannettite was officially discredited as identical to hainite (IMA 06-C). Unfortunately in 2003 two new mineral names were also introduced in the literature for ill-defined materials without IMA approval.

 

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