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Electron paramagnetic resonance (EPR), optical, infrared and Raman spectral studies have been performed on a natural Actinolite mineral. The room temperature EPR spectrum reveals the presence of Mn 2+ and Fe 3+ ions giving rise to two resonance signals at g=2.0 and 4.3, respectively. The resonance signal at g=2.0 exhibits a six line hyperfine structure characteristic of Mn...
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