Abstract
The color change of the pink and colorless LiAlSi2O6 spodumene crystal due to irradiation and heating is explained. The hypothesis about the change of Mn3+ to Mn4+ after irradiation was rejected. For the studied crystals, it was shown that both Mn2+ and Mn3+ occupy the M2 (not the M1) crystal site. Spodumene crystals which are primary pink (kunzite) contain Mn3+ (and Mn2+) at the M1 site. By contrast, those that become pink due to irradiation and heating contain Mn3+ and Mn2+ at the M2 site. The emission band of the former is 625 nm, and for the latter, it is 591 nm.
Highlights
Spodumene (LiAlSi2 O6 ) is a member of the clinopyroxene group which contains chains of corner-sharing SiO4 groups running along the c-axis and interconnected by chains of edge-sharing
We present complementary spectroscopic data focused twobeen issues: 2+, known as persistent luminescence properties of Mn luminescence, haveonalso presented [11]
It is very likely that Mn3+ occupies the M2 site of monoclinic symmetry
Summary
Spodumene (LiAlSi2 O6 ) is a member of the clinopyroxene group which contains chains of corner-sharing SiO4 groups running along the c-axis and interconnected by chains of edge-sharing. AlO6 octahedra and irregularly shaped polyhedra of six-fold coordinated lithium ions. It is monoclinic with space group C2h 6 (C2/c) and unit cell parameters are a = 9.479 Å, b = 8.403 Å, c = 5.223 Å and β = 110.14◦ [1]. Li and Al occupy the special Wyckoff position 4e with site symmetry 2 (C2 ), while Si and O are on the general Wyckoff position 8f with site symmetry 1 (C1 ). Coordinated Al3+ ions occupy M1 sites and
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