MINERALOG~MORPIIOLOG~AND CRYSTAL-CIIEMIS'I1IY OF MONAZITE F1IOM CMil lAo I (GO. BRAZIL) The Catetno alkalinc carbonatite complcx hostsa numbcr of minera l resources includin g monazite. This mineral is a common access ory phase in two lithological units: carbonatite and silexi te. Textural ev ide nce sugges t that mon azite replaced carbonates in the carbc natite and crys tallized simultaneously with qua rtz in the silexite. Monazite was resistant to the strong laterization that affected the massif, exce pt for the inc ipient transformation into gorce ixite or ccr ianitc. In both car bonatitc and sile xitc, monazite occu rs as a complex agg reg ate of sub-rnicrometric crystals, show ing unusua l morp hological and chem ical characte ristics. It contains Ca, Sr, and Ba in the A-site, and sho ws a certain deg ree of hydra tion indicated by ATD and IV data. Structuralform ulae calcu lated on the basis ofsum of cations > I show a mod erate ionic deficiency ill the anionic site. Rietveld rcffincm cnt indicated poor crystal linity. Notwi thstanding these peculiar charac teristics, cel l dimensions are similar to those of standa rd monazite.
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