Spinel - UV-Vis spectra
Violet:
Blue:
- Blue spinel - 1.10 ct - Sri Lanka
- Grayish-blue spinel - 4.01 ct - Verneuil Man-made
- Grayish-blue spinel - 3.56 ct rough - Kalu River, Rathnapura, Sri Lanka
- Strong 'glowing' pink spinel - 0.34 ct - Mogok, Myanmar
- Pink spinel - 0.84 ct - Kukh-i-Lal mine, Pamir Mts, Tajikistan
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
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Strong Cr3+ absorption at 547 nm and emission 'artifacts' between 670 and 715 nm.
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
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No spectrum