Ecuadorian feldspar characterization by instrumental analytical techniques and statistical calculation of uncertainty for the reliability of results
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Abstract
The objective of this study is to analyze and characterize a sample of an Ecuadorian feldspar, using DRX, SEM and TGA techniques, for the microstructural analysis of mineral phase and chemical composition. The qualitative and quantitative X-ray diffraction analysis through Rietveld refinement reveals that this feldspar is composed of 33.31% of Albite, 15.70% of Quartz and a large weight percentage of 50.99% of amorphous material . To validate these results, the uncertainty of the measurement was investigated and calculated, using a statistical analysis of standard deviation, resulting in an uncertainty error of ± 0.87wt%, ± 0.23wt% and ± 0.89wt% respectively for the percentages by weight of the minerals found in this anailysis. The result by SEM shows the presence of Albite in the feldspar exhibiting laminar twinning and characterized by spherical quartz and plagioclase inclusions that are randomly dispersed.
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