Abstract
Natural halite displays wide range of colors which is considered as mineralogical rarity. Such variation suggests that the said cubic crystal structure can harbor a great variety of lattice defects as color centers. Raman spectroscopy is the powerful tool for investigation of mineralogical phases as well as very sensitive to the defects formed in crystal structure. Amongst various types of color centers (F, R1, R2, M – centers and Plasmons) found in natural colored halite samples, F-centers in present colored halite samples have been confirmed using Photoluminescence (PL) analysis. Detail Spectroscopic studies using Micro-Raman spectroscopy and Photoluminescence (PL) indicate that the blue coloration of the studied halite crystals is due to stoichiometric excess of metallic sodium (Na-colloids) in crystal lattices.
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