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 ²B_1g→²B_2g and ²B_1g→²A_1g 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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