Characterization of lithium (Li) minerals from the Fregeneda-Almendra region through laboratory spectral measurements: a comparative study

J. Cardoso-Fernandes; J. Silva; A. Lima; A. C. Teodoro; M. Perrotta; J. Cauzid; E. Roda-Robles

doi:10.1117/12.2573941

20 September 2020 Characterization of lithium (Li) minerals from the Fregeneda-Almendra region through laboratory spectral measurements: a comparative study

J. Cardoso-Fernandes, J. Silva, A. Lima, A. C. Teodoro, M. Perrotta, J. Cauzid, E. Roda-Robles

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Proceedings Volume 11534, Earth Resources and Environmental Remote Sensing/GIS Applications XI; 115340N (2020) https://doi.org/10.1117/12.2573941
Event: SPIE Remote Sensing, 2020, Online Only

Abstract

Although several lithium (Li) bearing minerals have already been spectrally characterized, there are no current reference spectra for petalite in large and public access spectral libraries. This fact is aggravated by the difficulty in the identification of petalite’s diagnostic features. The study area of this work is the Fregeneda (Spain) – Almendra (Portugal) region, where distinct Li bearing minerals occur in several types of enriched pegmatite dikes. Accordingly, the objectives delineated for this work were: (i) improve the existing knowledge on the spectral signatures of Li bearing minerals (lepidolite, spodumene, petalite); (ii) compare the spectra obtained for petalite and spodumene in the study area; (iii) and compare the spectra of the Li bearing minerals from the Fregeneda-Almendra area with the reference spectra from the United States Geological Survey (USGS), the ECOSTRESS and the Geological Survey of Brazil (CPRM) spectral libraries. For that, spectral measurements were conducted in the laboratory using the SR-6500A (Spectral Evolution, Inc.) spectrometer. The results only allowed to discriminate lepidolite, since that, both, petalite and spodumene, present absorption features typical of montmorillonite and illite, or a combination between these two minerals. This is also verified in samples of corresponding minerals in other spectral libraries. No diagnostic features of these two Li bearing minerals were identified, highlighting the difficulty to spectrally discriminate them from each other and from clay minerals.

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J. Cardoso-Fernandes, J. Silva, A. Lima, A. C. Teodoro, M. Perrotta, J. Cauzid, and E. Roda-Robles "Characterization of lithium (Li) minerals from the Fregeneda-Almendra region through laboratory spectral measurements: a comparative study", Proc. SPIE 11534, Earth Resources and Environmental Remote Sensing/GIS Applications XI, 115340N (20 September 2020); https://doi.org/10.1117/12.2573941

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