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Studies of chrysoprase and microcrystalline silica varieties from serpentinites of Szklary Massif (Foresudetic Block, SW Poland) by Raman spectroscopic technique – preliminary results

Korybska-Sadło I.

Mining Science

2015

Vol. 22, Special Issue 2

39--45

The mineralogical properties of green colored chalcedony varieties from weathering cover of slightly serpentinized peridotites (harzburgites) occurring near Szklary village on Foresudetic Block (SW Poland) are studied using Raman spectroscopy in the 200 – 1600-1 wavenumber region . The obtained results show, that in examined samples, the peaks like: 206, 265, 355, 394, 464, 696, 796, 808 cm-1, characteristic for α-quartz were ascertained. In one sample, the characteristic moganite peak (502 cm-1) was found. It implies that presence of other polymorphs of SiO2 in crystalline structure, considered a proof for presence of moganite intergrowths with α-quartz. It indicate, that intensity of green color of measured samples of chrysoprase are not correlated with Raman spectroscopic data. It can be conclude, that examination of Raman spectra can be useful only to recognition of internal phase composition of green cryptocrystalline silica polymorphs occurring in weathering cover of serpentinized peridotites.