Abstract
The main purpose of this work is the chemical and mineralogical characterization of a biotite-shist from northern Brazil, in order to evaluate its potential as an alternative rock of potassium fertilizer. For the characterization, one composite sample of about 40 Kg was crushed and classified into four subsamples with the following grain sizes: (-4000 +1000), (-1000 +300), (-300 +53) and (-53) μm. All four subsamples were submitted to the following analyses: X-ray diffraction (XRD), X-ray fluorescence (XRF), Fourier Transform Infrared Spectrometry (FTIR) and optical microscopy (OM) for textural analysis. The biotite-shist is mainly composed by albite, quartz and biotite, besides small amounts of chlorite and traces of K-feldspar and clinopyroxene. No significant mineralogical variation was observed among the studied granulometric fractions. Mean K2O contents are 2,61%, above the minimum of 1% required by the Normative Instruction of the Ministry of Agriculture of Brazil. Although further studies are still needed, the biotite-shist studied may have good potential when compared to other rocks already used in Brazil, e.g., other biotite schists from Central Brazil, as agromineral or soil remineralizer. Keywords: Biotite-schist, potassium fertilizer, soil remineralizer, agromineral.
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