FELDSPAR

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The term alkaline feldspar includes potassium feldspar and sodium feldspar, which is also known as sodium plagioclase or albite. This is the most abundant group of minerals in the Earth's crust.

Just like quartz, alkaline feldspar is a byproduct at the Penouta Mine, obtained from different types of rocks, which give it different compositional and rheological properties. Feldspar comes from:

  • Filonian rocks: Feldspars occur in banded pegmatites in the cupola zone of the mineralized granite or those hosted by the metamorphic rocks. These feldspars are mostly potassic, although occasionally, very fine-grained plagioclase can occur, particularly in the banded pegmatites.
  • Igneous rock: particularly in mineralized albitic granite, where albite dominates with 60% weight compared to the maximum 20% of potassium feldspar. Potassium feldspar is present in the phenocrystals, sometimes with evidence of corrosion. Albite is present in crystals of variable size, but always finer than potassium feldspar.
  • Metamorphic rocks: these are for the most part orthogneisses, with potassic feldspar and oligoclase porphyroclasts higher Ca content than the albite in granite. Feldspars of this type of rock are the least common.

Characterization of feldspar concentrate

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Potential feldspar applications

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Technical Datasheet - Potassium Feldspar

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