Mineralogy of phosphate accumulations in the Huber stock, Krásno ore district, Slavkovský les area, Czech Republic (original) (raw)
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Archives for Technical Sciences, 2014
The Srebrenica orefield is mostly composed of Tertiary dacite-andesites, and quartz latites, pyroclastites, Paleozoic schists, and Quaternary sediments, but in a in a lesser extent. The latest research showed that in the Srebrenica orefield occur complex mineral parageneses and associations deposited in pneumatolytic-hydrothermal and hydrothermal (from high-to low-temperature) stage, accompanied with very rare minerals. Beside ore mineral parageneses and associations, specials emphasis was on rare hydrated phosphates: vivianite, ludlamite, and vauxite. It is important to say that vauxite from the Srebrenica orefield is fourth discovery in the world. The minerals above were studied using DTA-TGA, IR-spectroscopy, and XRPD.
Phosphates of Ukraine as raw materials for the production of mineral fertilizers and ameliorants
2019
The article analyzes the present state of the phosphate raw material base to meet Ukrainian chemical enterprises' needs. In Ukraine, a number of complex apatite and phosphorite deposits have been explored. Their exploitation can lead to a complete supply of Ukrainian chemical enterprises with raw materials and can partly reduce the amount of expensive imported phosphate mineral fertilizers. At present, the following deposits, where apatite is connected with other useful components, are prepared for exploitation: Stremyhorod, Fedorivka, Novopoltavka, Kropyvna and others. The advantage of the development of these deposits is the possibility to extract apatite along with the production of rare earth concentrates, ilmenite, titanomagnetite, as well as feldspars, olivine, pyroxenes, mica and others which will significantly increase the profitability of the deposits development. The alternative to apatite-containing deposits in Ukraine can be sedimentary deposits of nodule, granular a...
Journal of Geosciences, 2015
An interesting association of phosphate minerals (fluorapatite, triplite, arrojadite-group minerals and viitaniemiite) was studied from intra-granitic hydrothermal quartz veins with minor amounts of albite, orthoclase, muscovite, fluorite, rhodochrosite, arsenopyrite, pyrite, bismuthinite and kobellite. The veins occur in highly evolved, Permian topaz-zinnwaldite leucogranite at the Elisabeth adit near Gemerská Poloma, Gemeric Unit, Western Carpathians (eastern Slovakia). Fluorapatite is enriched in Mn (~4 wt. % MnO, 0.3 apfu Mn) and frequently replaced by triplite, representing the first known triplite occurrence in Western Carpathians. This mineral forms irregular aggregates (≤ 7 cm across), Mn/(Mn + Fe) atomic ratio of which attains 0.68 to 0.78 and F/(F + OH) = 0.89-0.92. "Fluorarrojadite-(BaNa)" to its Mn-dominant analogue "fluordickinsonite-(BaNa)" (both minerals still not approved by IMA-CNMNC) occurs as aggregates up to 2 cm across, showing Sr-rich (~1.7 wt. % SrO, ~0.36 apfu Sr) and Sr-poor (≤0.6 wt. % SrO, ≤0.13 apfu Sr) compositions with W site F/(F + OH) = 0.74-0.80 and M site Mn/(Mn + Fe) = 0.39-0.52. Rare viitaniemiite is Mn-rich (10 to 11 wt. % MnO, 0.34-0.38 apfu Mn). The phosphate mineralization in quartz represents a high-temperature hydrothermal assemblage. The F-rich Mn, Fe, Ca-bearing phosphates, fluorite, and muscovite precipitated most likely in presence of alkali-and fluorine-bearing post-magmatic fluids which altered primary magmatic minerals (especially Li-rich micas and alkali feldspars) and liberated some elements (Fe, Mn, Al, Ba, Sr, Na, K) from the adjacent granite.
Secondary phosphates of La Paloma mine, Zarza la Mayor, Cáceres, Spain
Mineral Up, 2011
A series of rare phosphates, generally in the form of microcrystals, have been found at the La Paloma mine, Zarza la Mayor, Cáceres, Spain, within geodes in the quartz. Among them can be highlighted zinc-rich beraunite, plimerite, kidwellite, cyrilovite, chalcosiderite, corkite, kintoreite, goyazite, benauite, phosphosiderite and natrodufrenite.
Acta Mineralogica-Petrographica, Szeged, 2004
Ca-dominant, Al-phosphate-sulphate (APS) minerals with minor Ba, Sr, K, Na and REE contents were found in hydrothermal alunite or separately in advanced argillic alteration zones associated with high-sulphidation type epithermal systems in Hungary (Velence Mountains) and Slovakia (Podpolom deposit, Klokoč). Electron microprobe analyses show that these APS minerals are woodhouseite with SO42- and PO43- molar ratio varying between 1:3 and 2:1. The occurrence of APS minerals in close association with alunite and other hydrothermal minerals indicates a hypogene origin for these phases. Extensive leaching of magmatic minerals (apatite, feldspar) in the host rock by strongly acidic magmatic-hydrothermal fluids induced the formation of phosphate-bearing minerals. Changing physico-chemical characteristics of the hydrothermal fluids with time resulted in zoning and multiphase formation of these alunite-type minerals, with a common late phase dominated by pure sulphate (alunite). This is the first detailed documentation of hydrothermal APS minerals in alteration systems of the Carpatho-Pannonian region.
New and Rare Phosphate Occurrence
2015
was reported for the first time in nature from the oxidation zone of the siderite-ankerite deposit from Vashegy (currently known as Zeleznik in Slovakia)
Journal of GEOsciences, 2012
This paper presents results of study of supergene minerals occuring at the Huber stock and Schnöd stock in the Krásno Sn-W ore district near Horní Slavkov (Slavkovský les area, Czech Republic). The mineralogical research is based on X-ray powder diffraction, electron microprobe analyses, optical and electron microscopy. The paper includes encyclopaedia-type presentation of the identified mineral species. The role of late hydrothermal, supergene, sub-recent and recent processes in the formation of minerals and their associations is discussed.
Ca-dominant, Al-phosphate-sulphate (APS) minerals with minor Ba, Sr, K, Na and REE contents were found in hydrothermal alunite or separately in advanced argillic alteration zones associated with high-sulphidation type epithermal systems in Hungary (Velence Mountains) and Slovakia (Podpolom deposit, Klokoč). Electron microprobe analyses show that these APS minerals are woodhouseite with SO 4 2and PO 4 3molar ratio varying between 1:3 and 2:1. The occurrence of APS minerals in close association with alunite and other hydrothermal minerals indicates a hypogene origin for these phases. Extensive leaching of magmatic minerals (apatite, feldspar) in the host rock by strongly acidic magmatic-hydrothermal fluids induced the formation of phosphate-bearing minerals. Changing physico-chemical characteristics of the hydrothermal fluids with time resulted in zoning and multiphase formation of these alunite-type minerals, with a common late phase dominated by pure sulphate (alunite). This is the first detailed documentation of hydrothermal APS minerals in alteration systems of the Carpatho-Pannonian region.