The sulfide mineralization at Xylagani is hosted in metamorphosed mafic massive and pillow lava. It has an Early–Middle Jurassic age belongs to the Makri unit, which represents upper crustal section of Evros ophiolite Circum Rhodope Belt, Northern Greece. protolith host rock basalt that a boninitic-to-low-Ti tholeiitic composition was formed intra-oceanic supra-subduction zone within juvenile forearc-to-volcanic arc setting. volcanic rocks were subjected ocean-floor metamorphism very...

Accessory REE minerals occur in a small metamorphic magnetite ore deposit at Bacuch, Veporic Superunit, central Slovakia. We distinguish two populations of monazite. Monazite I forms subhedral to euhedral crystals associated with magnetite. It contains ≤12 wt.% ThO2, ≤2.7% UO2, ≤0.85% SO3, low Ca and Sr contents. Compared the common monazite-(Ce) I, monazite-(Nd) (≤26.1% Nd2O3) occasionally occurs an atomic ratio Nd:Ce up 1.17. II is present as irregular aggregates hingganite younger...

The sediment-hosted As-Sb-Tl-Pb ± Hg Au Janjevo occurrence is located in the southern part of Kizhnica-Hajvalia-Badovc ore field, Trepça (Trepča) Mineral Belt (TMB) Kosovo. mineralization hosted by Upper Triassic marbles and occurs form quartz-stibnite veins dolomitized irregular pockets associated with jasperoid rocks. main sulfide most widespread studied pyrite which carrier thallium. A wide range techniques was used to characterize geochemistry textural evolution pyrite/marcasite from...

Neoproterozoic pegmatite from Skoddefjellet, Wedel Jarlsberg Land, Spitsbergen: Additional evidence for c . 640 Ma tectonothermal event in the Caledonides of Svalbard ( Ma) amphibolite facies metamorphism and deformation have been shown recently to affected Isbjørnhamna Eimfjellet Complex Land southwestern Spitsbergen. New SHRIMP zircon U-Pb situ electron microprobe monazite uraninite U-Th-total Pb ages are presented here on a occurring within metasedimentary rocks. Although dated zircons...

Agate samples collected from the vicinity of Asni and Agouim (Western Atlas, Morocco) were investigated using microscopic observations supported by Raman micro-spectroscopy. The agates are marked presence various microtextures typical epithermal vein deposits, including jigsaw-puzzle, feathery, lattice-bladed. first two indicate that formation was likely recrystallization metastable silica phases (i.e., opaline or massive chalcedony). lattice-bladed (after barite calcite) quartz may be, in...

Stannite group minerals (ferrokësterite and stannite) occur in small amounts association with sulfides hydrothermal Pb-Zn deposits Kosovo. The chemical composition of sphalerite co-existing Sn-bearing has been investigated using laser ablation inductively-coupled plasma mass spectrometry (LA-ICP-MS). Flat Sn-spectra suggest that Sn is bound the lattice or as nanoincluions. Sphalerite from Stan Terg, overgrown by ferrokësterite, contains lowest content (few ppm) have precipitated before...

Abstract This contribution reviews and affords new insights into the crystal chemistry of gadolinite-datolite group (GDG) silicates by re-examination published unpublished analytical data. More than 200 electron microprobe analyses (EMPA) data from both single-crystal powder X-ray diffraction 53 samples GDG were collected to study site occupancy effects on local long-distance geometry structure. Results achieved statistical analysis bond-length bond-angle calculations. Here,...

Agate nodules from Kerrouchen (Khénifra Province, Meknés-Tafilalet Region) in Morocco occur Triassic basalts and reach up to 30 cm diameter. Monocentric, banded agates—mainly pastel pink, grey, white yellow—with infiltration canals (osculum) are observed. Raman microspectroscopy revealed that the agates mainly consist of low quartz subordinately moganite with distinctive 460 501 cm−1 marker bands, respectively. Linear mapping indicated concentrates grey zones monocentric agate nodules. The...

Abstract The pre-Caledonian NYF Skoddefjellet pegmatite in Wedel Jarlsberg Land, Svalbard, contains xenotime-(Y) that is partly replaced by fluorapatite-hingganite-(Y) reaction coronas. Hingganite-(Y) up to 2.0 wt.% of Gd 2 O 3 , 4.7 Dy 3.3 Er and 5.5 Yb . Such unusual, previously undescribed, breakdown was caused Ca- F-bearing fluids interacting with the pegmatite. occurrence hinnganite-(Y) as a product implies Be-bearing phase (beryl this case) also involved reaction. There are few...

The main goal of this paper is to determine the order paragenetic sequence and phase transitions Ni–Fe sulfide association hosted in listvenites. Listvenites are hydrothermally altered mafic ultramafic rocks that often associated with active tectonic settings, such as transform faults, suture zones, regional extensional usually contact volcanic or carbonate rocks. Listvenitization displayed by a carbonation process when original olivine, pyroxene, serpentine group minerals Mg–Fe–Ca...

This study reports silver mineral association found recently in the Stan Terg lead and zinc mine, located Vardar zone (in northern Kosovo).The described mineralization comprises pyrargyrite (Ag 3 SbS ), freieslebenite (AgPbSbS high-Ag bearing tetrahedrite freibergite ((Ag 4+2x Cu 2-2x )[(Cu,Ag) 4 (Fe, Zn) 2 ]Σ6Sb S 12 1-x with (0 < x 1)); as well native compounds (Electrum, composition of those minerals was confirmed by electron microprobe.The from is antimony).The Ag-minerals occur vuggs...

An interesting association of the Bi sulfosalts was identified in Rozalia mine, Hodrusa–Hamre, Slovakia. Sulfosalts cuprobismutite series are most common, and occur paragenesis with other sulfosalts, chalcopyrite hematite. Members pavonite homologous associated bismuthinite derivatives quartz amethyst variety. Three members four have been found a hydrothermal base-metal mineralization mine. Kupcikite has structural formula (Cu 6.73 Fe 1.10 ) ∑7.83 (Bi 9.49 As 0.36 Ag 0.24 ∑10.09 (S 18.89 Se...

Abstract New mineralogical and mineral-chemical data from the Stan Terg deposit, Kosovo, revealed presence of abundant Bi-sulphotellurides associated with Bi- Sb-sulphosalts galena in pyrite–pyrrhotite-rich skarn-free ore bodies (ores without skarn minerals). The Bi-bearing association comprises (joséite-A, joséite-B, unnamed phase A a chemical formula close to (Bi,Pb) 2 (TeS) , B composition 2.5 Te 1.5 S ), ikunolite, cosalite, Sb-lillianite, members kobellite series Bi-jamesonite....

This paper describes a newly discovered Bi-Cu±Au mineralization co-occurring with Pb-Zn-Ag hydrothermal within the Kizhnica-Hajvalia-Badovc ore field, central Kosovo, Vardar Zone. The mineralogy of two styles was described using EPMA in combination reflected and transmitted light microscopy. Hydrothermal Cu-Bi veinlets Kizhnica andesite quarry consist Bi sulfosalts (bismuthinite, cosalite, aikinite, krupkaite), pyrite, hematite, chalcopyrite, galena, sphalerite, tetrahedrite group minerals....

Our study characterizes in detail the mineralogical, textural, and compositional features of Ta-Nb oxides from Bugarura – Kuluti deposit located eastern Rwanda. The research presents chemical evolution at all scales, a single crystal, through host body, to regional granite pegmatite scale. Finally, we propose an evolutionary model B-rich magmatic hydrothermal system hosting Ta-Nb-Sn mineralisation. are hosted by LCT (lithium-caesium-tantalum) pegmatites, rarely greisens two-mica peraluminous...

This work presents a mineralogical and geochemical study of Cu-Bi-Ag ± W ores from Janjevo in the Trepça Mineral Belt Kosovo.This locality indicates new type Bi-Cu Au mineralization within Kizhnica-Hajvalia-Badovc ore field, including Cu-Bi Ag As sulfosalts paragenesis previously not described Kosovo this part Vardar Zone.Chemical composition Bi-Pb Cu ±Ag sulfosalts, sulfides, associated minerals, as well their paragenetic relationships distribution minor trace elements main are discussed...

Rare Cu-Bi sulphosalt, hodrušite, occurs in the Rozália vein (levels X-XIV of mine, Hodruša-Hámre ore deposit near Banská Štiavnica, central Slovakia) two unusual morphological forms.The first type are brownish bronze thin acicular striated crystals, up to 3 mm long, drusy cavities quartz-hematite gangue, which usually grouped into chaotic or irregular aggregates.The second hodrušite comprises flattened columnar aggregates, 1.5 cm overgrown by hematite quartz gangue.These aggregates...

Crystal structure of robinsonite from the locality Male Zelezne, Nizke Tatry Mountains, Slovakia, has been refined using single-crystal data (MoKa X-ray diffraction, CCD area detector) to conventional R-factor: R 1 = 0.045. Robinsonite crystallizes in space group 12/m, with a 23.642(4), b 3.9761(6), c 24.420(4) A, β 93.808(3)° and Z 4. diffraction chemical analysis resulted comparable formulae, Pb 4 . 0 3 Sb 5 9 7 S , respectively, which are close ideal formula 6 is member large family...

Bi-Se-Te mineralization from Úhorná (Spišsko Gemerské Rudohorie Mts., Słovakia): A preliminary report An unusual association of Se minerals was studied. enters into the structures sulphosalts - bournonite, jamesonite and tintinaite at concentrations up to 0.10, 0.38 1.11 apfu, respectively. However, Te, together with Bi, also form discrete such as tetradymite, laitakarite, ikunolite hedleyite. Members laitakarite-ikunolite solid solution display a wide range anion substitution nearly Se-free...

The first documented occurrence of Nb-Ta mineralization in a granitic pegmatite from the Svalbard Archipelago, Arctic Caledonides and relationships between primary secondary Nb,Ta-bearing phases are discussed. Skoddefjellet NYF located southwest Spitsbergen (Wedel Jarlsberg Land) is characterized by enrichment Nb, U, Zr, Y, REE Pb, low Zr/Hf (∼8-10), (∼8-12) Nb/Ta ratios. Columbite-(Fe) columbite-(Mn) (locally enriched Ti, Sc Ca) Nb,Ta, Y-bearing titanite (≤3.8 wt. % Nb2O5, ≤1.9 Ta2O5, ≤2.9...

The paper presents comprehensive mineralogical and geochemical characteristics of Dominican amber-bearing sediments from Siete Cañadas, Hato Mayor Province the Eastern Mining District (EMD) in Cordillera Oriental. rocks collected borehole Cañadas area were compared with petrography coaly shales La Cumbre Northern (NMD). mineralogy was determined using transmitted reflected light microscopy, scanning electron Powder X-ray diffraction Fourier Transform Raman Spectroscopy. Biomarker analyses by...