Study of luminescence, color and paramagnetic centers properties of albite

• The TL and EPR spectra have been measured in natural albite crystal.
• Albite crystal shows TL peaks at 140, 260 and 350 °C.
• The TL emission spectrum of albite presented bands around 275, 400 and 560 nm.
• The EPR spectrum shows hyperfine lines due to Al–O−–Al center superposed on Fe3+ signal.

A sample of natural albite, NaAlSi3O8, from the state of Minas Gerais, Brazil, has been investigated. The mineral is a solid solution of K-feldspar (4600 ppm – K) and Ca-feldspar (1100 ppm – Ca). The TL spectra of natural and the pre-annealed at high temperature albite presented a very intense band around 275 nm and weaker bands around 400 and 560 nm. Other TL properties have been investigated through monochromatic (275 nm and 400 nm) glow curves. The EPR spectrum measured at low temperature (77 K) shows the typical 11 lines signal due to Al–O−–Al center superposed on Fe3+ signal around g = 2.0. The EPR spectra above 260 K show only g = 2.0 signal due to Fe3+ ions.

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