Abstract
Near infrared (NIR) spectra of the strashimirite minerals from two different origins have been investigated. The structure and spectral properties of a copper-bearing arsenate mineral are compared. Two prominent bands observed at 11,187 cm−1 and 8443 cm−1 (Czech) and 11327 cm−1 and 8732 cm−1 (Slovak) are assigned to 2B1g→2B2g and 2B1g→2A1g transitions of Cu2+ ion in strashimirite. Intense bands at 7247 cm−1 and 6800 cm−1 are attributed to the first overtone of the water and OH fundamentals observed in a complex spectral profile centred upon 3300 cm−1. The very broad NIR band at 5150 cm−1 is assigned to combination bands of water and OH vibrations. Bands in the 4800 cm−1 to 4000 cm−1 are assigned to (AsO4)3− combination bands.
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