Introduction
Periodicals
Bulletin mineralogicko-petrologického oddělení Národního muzea v Praze
2011/19/1
Hydrotermálny anhydrit z epitermálneho polymetalického ložiska Banská Štiavnica (Slovenská republika)
Hydrotermálny anhydrit z epitermálneho polymetalického ložiska Banská Štiavnica (Slovenská republika)
Martin Števko, Peter Bačík
| Pages | 83-87 |
|---|---|
| Citation | ŠTEVKO, Martin a BAČÍK, Peter. Hydrotermálny anhydrit z epitermálneho polymetalického ložiska Banská Štiavnica (Slovenská republika). Bulletin mineralogicko-petrologického oddělení Národního muzea v Praze. Prague: National Museum, 2011, 19(1), 83-87. ISSN 1211-0329 (print), 1804-6495 (online). Also available from: https://publikace.nm.cz/en/periodicals/bmpholnrhmvp/19-1/hydrotermalny-anhydrit-z-epitermalneho-polymetalickeho-loziska-banska-stiavnica-slovenska-republika |
Hydrothermal anhydrite was found in short and up to 8 cm thick carbonate vein with base metal mineralization at the 12th level of the Banská Štiavnica epithermal base metal deposit, Slovak Republic. It occurs as pale-blue to colourless tabular crystals up to 3 cm in size, which are intergrown to form groups of parallel or radial aggregates together with calcite, sphalerite, galena and gypsum. The crystals have a vitreous to silky lustre and typical perfect cleavage. The following unit-cell parameters were refined from powder X-ray data of anhydrite: a = 6.2967(2) Å, b = 6.9770(2) Å, c = 6.2268(2) Å and V = 303.53(1) Å3. An infrared absorption spectrum of anhydrite shows characteristic bands of antisymmetric stretching vibration modes (1157 and 1124 cm-1) and antisymmetric bending vibration modes (675, 613 and 596 cm-1) of SO4 tetrahedra. A weak band which was observed at 511 cm-1 represent most probably symmetric bending vibration of sulfate groups. Anhydrite together with gypsum represents products of relatively low-temperature solutions at the late stage of hydrothermal activity.
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