Composition and structural features of rock-forming and gem chlorites from the Korshunovskoe deposit, Siberian Platform, have been studied. Both chlorite varieties are close in chemical composition and are high-Mg c1inochlores. It has been established by X-ray diffraction that the rock-forming chlorite is represented by the commonest polytype IIb with a monoclinic unit cell (β = 97°), while among the gem samples, along with chlorite IIb, there is chlorite made up of packets of the Ib polytype with a rhombic unit cell (β = 90°). IR spectrum of Ib chlorite has considerable differences as compared with the chlorite IIb spectrum, owing mainly to weaker hydrogen bonds between layers making up the Ib structural type.
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