Precious and Decorative



Stones


scientific practical journal
State Gemmological Centre of Ukraine
Ministry of Finance of Ukraine
ISSN: 2079-1410
DOI: 10.53036
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2015: No. 1 (79)  CONTENTS



Genesis of semiprecious stones (minerals from quartz group) in volcanic rocks

K. Rudenko
National Museum of Natural History of NAS of Ukraine
K. Derevska
National Museum of Natural History of NAS of Ukraine
S. Kozhenevskiу
LLC "Vodospad"
 
Language: Ukrainian
Precious and Decorative Stones. No. 1 (79), 2015: 13–15
Abstract
The horizontally elongated cavities and cracks, which sometimes widen and have zonal quartz minerals filling, were observed during recent field study in basalt quarry near the v. Polytsi (Volhyn). Amethyst occurs there.
Mineralogical and geochemical study were shown that the conditions for the semi-precious stones formation and filling zheod basalts in the volcanic province Volhyn are similar to those in South America.
References
1. Commin-Fischer A., Berger G., Polvé M., Dubois M., Sardini P., Beaufort D., Formoso M. Petrography and chemistry of SiO2 filling phases in the amethyst geodes from the Serra Geral Formation deposit, Rio Grande do Sul, Brazil. Journal of South American Earth Sciences 29, 2010, 751–760.
2. Hartmann L. A., Duarte L. C.,. Massonne H.-J, Michelin C., Rosenstengel L. M., Bergmann M., Theye T., Pertille J.,. Arena K. R, Duarte S. K., Pinto V. M.,. Barboza E. G, Rosa M. L. C.C., Wildner W. Sequential opening and filling of cavities forming vesicles, amygdales and giant amethyst geodes in lavas from the southern Paranà volcanic province, Brazil and Uruguay. international Geology Review Vol. 54, № 1, 2012, 1–14.
3. Pertille J., Hartmann L.A., Duarte S.K., Arena K., Rosa M.L.C.C., Barboza E.G. Gossan characterization in the QuaraÍ and Los Catalanes amethyst geode districts (Brazil and Uruguay), Paranà volcanic province, using rock geochemistry and gamma-spectrometry. Journal of Geochemical Exploration 124, 2013, 127–139.
 
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