Acta Musei Moraviae

...zircon, apatite, and scheelite. The rock probably originated by regional metamorphism of chemically suitable protolith (basic tuffs and tuffites) at relatively oxidic conditions. Andradite-meionite-pyroxene rock occurs in lithologically specific sequences which can be characterized mainly by the presence of biotite-magnetite leucocratic gneisses and calcite-andradite microclinites including locally unusual andradite pegmatites....

Corundum-bearing pegmatite from Pokojovice near Třebíč, Czech Republic The Pokojovice corundum-bearing pegmatite is found in the varied group of Moravian Moldanubicum. It forms a discordant dike, up to 2 m thick, penetrating amphibolite with thin layers of calcite marble, and skarn-like rocks. The pegmatite is composed of three different units:...

Dolomite marbles at contact of the Moldanubicum and Moravicum in the area between Jasenice and Oslavany Dolomite marbles at the contact of the Moldanubicum and Moravicum in the area between Jasenice and Oslavany were studied. The observed mineral assemblages, metamorphic zonality, chemical composition of dolomite marbles and lithostratigraphy of the...

Calcite-andradite microclinite from Markvartice near Třebíč, western Moravia In the paper submitted, the basic geological, petrological and mineralogical data about calcite-andradite microclinites at Markvartice are presented. These rocks are a part of the Varied Group of the Moravian Moldanubicum and originated by metasomatism of gneisses and marbles along the tectonic...

A new lepidolite pegmatite from Sedlatice near Želetava, western Moravia A new lepidolite pegmatite was found N of Sedlatice in western Moravia. The pegmatite of unknown shape and size is emplaced in sillimanite – biotite paragneiss with amphibolite. Based on mineral paragenesis, it corresponds to the lepidolite subtype of complex...

...in Silesia, in both the current Czech and Polish areas. All Kaluža’s maps are based on lithology and have simple topography. There is an effort to express younger and older geological units, the evident influence of Werner’s Neptunist school. This work marked a significant advance in the knowledge of the...

...Graben form Moravian and Moldanubian Zone crystalline complexes and in the eastern part also Culmian sediments. Sedimentation in the basin had a fluvial to lacustrine character. Upper Carboniferous breccias and Balinka conglomerates represent the start of deposition, locally substituted by coarse-grained sandstones. Basal conglomerates along the western margin of the...

...carried out between 1883 and 1885. Only prospection works were previously performed in disseminated sulphide mineralization present at Mrakotin-Čejkovna and Hostětice near Telč, which is poor in silver like several other locations in the near Telč surroundings. We present chemical analyzes of several ore minerals and one ore-bearing quartz vein....

Ferrobustamite-bearing magnetite skarn in marble at Sokolí near Třebíč (Moldanubian zone, Western Moravia) Ferrobustamite was found in Fe-skarn at Sokolí and it is the first known occurrence in the Bohemian Massif. The skarn forms layer in marble enclosed in leucocratic migmatites (diatexites). Ferrobustamite (Ca4.58–4.70 Mn0.14–0.20 Mg0.01–0.13)5 Fe0.95–1.6 Si5.86–6.01 O18) forms...

Hydrothermal silver-bearing Pb-Zn mineralization in Moldanubian Pluton near Dačice and Slavonice Small deposits of silver-bearing base-metal ores have been mined in the past along the eastern margin of Central Moldanubian Pluton, especially in the 16th century. However, their production was insignificant, and there was not much information about mining at...

Chromium rich spinels of Upper Carboniferous Balinka conglomerates from south part of Boskovice Graben Balinka conglomerates formed the basal Upper Carboniferous sedimentation of Boskovice Graben and locally contain light-green fine-grained aggregates of Cr-mica and clay minerals. During the study of these phyllosilicates, relicts of Cr-rich spinel were found. Cr-rich spinel...

Research of Permo-Carboniferous sediments of the southern part of the Boskovice Graben; an overview (Part 1. History of Mining and Mineralogy) The Boskovice Graben represents a narrow depression of the NNE-SSW direction, filled of terrestrial Carboniferous-Permian sediments largely conglomerates and sandstones, less commonly also claystones, aleuropelites and minor pelocarbonates. Some...

...four calcite types were distinguished: dark orange calcite I and orange calcite II form the marble matrix, whereas pale orange calcite III and rare orange-yellow calcite IV are recrystallization products. Marble from the northern part of the Bílý Potok unit is typically strongly deformed, whereas marble in the southern part...

...rutile is noticeable in almandine porphyroblasts. The mineral assemblage includes plagioclase An34–35, quartz, biotite (phlogopite-annite) and sillimanite. Almandine garnet formed during exhumation of this part of Moldanubian Zone including partial melting at T ~ 650 °C and pressure of ~ 5–6 kbar. Almandine-bearing biotite gneisses with amphibolites, dolomite marbles and...

...sekaninaite, TiO2 phases (anatase, brookite, rutile), and cassiterite are common in the Strážek Moldanubicum but rather rare in other regions of the Moldanubian Zone, Bohemian Massif. Quartz, albite, muscovite, and tourmaline are present in several distinct morphological and paragenetic types. Spatially associated and genetically related muscovite veins are characterized by...

Green chromium-bearing mica in Balinka Conglomerates of Rosice-Oslavany Formation (Upper Carboniferous) at Oslavany Clasts of light-green mica containing chromium were recorded in the Upper Carboniferous conglomerates at Oslavany (Rosice-Oslavany Coalfield, Boskovice Graben). It is a potassium-deficient muscovite to illite (0.514–0.912 apfu K) with 0.88–2.29 wt. % Cr2O3 (0.046–0.119 apfu Cr)....

Mineral assemblage and chemical composition of Mg-wolframite and scheelite from Cetoraz by Pacov, Czech Republic Magnesium-bearing wolframite was analysed from the occurence near Cetoraz by Pacov. It forms grayish to black crystals up to 10 cm and irregular grains of various size. Wolframite composition is dominated in ferberite with average...

...the Třebíč durbachite pluton, the carbonate vein with silver-rich galena (1250 ppm Ag) found at Velké Meziříčí was never encountered by the early prospectors. The analyzed set of galena-rich ores shows a large variability in Ag and Au contents. With a few exceptions, the richest silver ores (> 1000 ppm...

...abundant pyrite and accessory (relic?) muscovite but no amphibole was detected in the same lithology at similar locality Javůrek-Stříbrnice. Siderite is (especially at the first locality) texturally complicated, mostly Mg-rich (20–40% Mg-component) with a low contents of Mn (Stříbrnice) and belongs among paragenetically early minerals. White fibrous amphibole and magnetite...

Mineralogically remarkable lamproite occurrence in the Třebíč Pluton at Střítež near Třebíč A new occurrence of a mafic dyke was recognised along the eastern termination of the Moldanubian zone at Střítež near Třebíč (western Moravia, Czech Republic), where crosscuts melanocratic amphibole-biotite granosyenite (durbachite) of the Třebíč Pluton. The studied rock...

Topography of historical mines and ore mineralizations in area of the Bílý potok, Western Moravia Remnants of historical mines for iron- and base-metal ores were re-investigated among villages Javůrek, Maršov, Svatoslav, Přibyslavice and Lesní Hluboké, in area 20 km NW from Brno (Czech Republic). The mines are situated at the...

...dominates ferberite (77–86 %) component over both huanzalaite (≤ 11 %) and hübnerite (6–10 %) components. Other analyzed elements are near (e. g. Bi, Ca, Nb, Sc, Ti, Zr) or bellow (Na, Pb, Sb, Sn, Ta, U, Y) detection limits. Primary wolframite-bearing occurrences in surrounding Moldanubicum contain scheelite-, cassiterite- and...

...near Borovec (1 km N from Štěpánov). The mineralization occurs in quartz-carbonate veins cross-cutting marbles and metapelites. The native silver locally intergrows with native copper in quartz-calcite gangue or in quartz cavities; rarely, it is enclosed in cuprite or chrysocolla. Malachite and iron oxides and hydroxides are common constituents of...

...corresponds to the formula (V3+1.890–1.980Cr3+0.020–0.040Al3+0.020–0.040)2(Ti4+2.810–2.850 V4+0.140–0.190)3 O9. Schreyerite is locally altered to hydrated TiO2 with higher contents of Al (≤ 0.060 apfu) and Fe (< 0.028 apfu) compared to the original phase. Schreyerite predominately formed by exsolution from vanadium-rich rutile in the metamorphic post-peak conditions of the upper amphibolite facies....

...by illite and rimmed by trilithionite-polylithionite was found in albite-lepidolite zone. Its composition varies among F-rich elbaite, fluor-elbaite and rossmanite. The compositional variation of tourmaline is similar to the general trend known from lepidolite-subtype pegmatites. Replacement of tourmaline by illite is most probably result of alteration by late hydrothermal fluids....

...coarse-grained parts of the mine dump and thus high mobility solutions, which did not have enough time to concentrate these compounds. Toxic components (As, Pb) are bound only at conditions of limited circulation of the solutions in finer material, poorly crystalline and amorphous ferric rusty-brown oxyhydroxidesulfates (AISA) and jarosite-beudantite minerals....

...This paper provides their review, based on published information of diverse provenance and quality, as well as on unpublished data of the authors. Problematic determination of several species is discussed. The mineralogical research in past 25 years was focused on several distinct fields. Research of particular rock environment was common,...

Geikielite-baddeleyite in mineral assemblage of dolomite marbles from the contact aureole of the Třebíč Pluton (Moldanubian zone) Within the inner part of metamorphic aureole of the Třebíč Pluton, geikielite-ilmenite and baddeleyite occur as accessory minerals in spinel-forsterite marbles. The most abundant is geikielite (or Mg-ilmenite) which forms opaque grains up...

...silver (1.5–4.2 wt. % Ag) were observed. Fluid inclusions were studied in quartz gangues. Only aqueous fluid inclusions were identified, the fluid system is H2O-MgCl2-NaCl with bulk salinity between 2.4 and 9.9 wt. % NaCl eq. The temperatures of homogenization range between 129 and 259 °C for primary inclusions. Both...

Pyromorphite from Jihlava ore district (Czech Republic) The supergene mineral assemblage of the Jihlava district, where Pb-Zn-Ag ores were exploited in the medieval age, is characteristic by pyromorphite occurrences. Pyromorphite forms yellow-green to green hexagonal crystals up to 1 cm in size and sometimes also brown or white, needle-like aggregates...

The mineral assemblages at the abandoned burning spoil-heaps in the Rosice-Oslavany Coalfield, Czech Republic Mineral assemblages formed recently at the abandoned burning spoil-heaps of the Kukla coal mine in Oslavany and Ferdinand coal mine in Zastávka. They originated in three stages. Pyrometamorphic stage I Tmax >1 100 °C produced hematite,...

Nordenskiöldine CaSnB₂O₆ from the locality Kozlov near Nedvědice, new rare accessoric mineral for Nedvědice marbles Very rare mineral of Europe – nordenskiöldine CaSnB2O6 – was found in Sn-rich calc-silicate assemblage (tin skarn) of Nedvědice marbles near Kozlov (4 km N from Nedvědice, western Moravia). It forms rare euhedral grains approx....

Zirconolite in marble at Krahulov and age of HT/LP metamorphism in the contact aureole of the Třebíč Pluton (Moldanubian zone) Regional-scale contact metamorphism of the Třebíč Pluton led to the formation of distinct zoning manifested typically in dolomite marbles. Inside part of metamorphic aureole appears rare zirconolite as an accessory...

Contribution to the knowledge of provenance of pebbles from the Upper Viséean conglomerates in the Drahany Hights: VI. – Skarnoid The pebble of leucocratic biotite migmatite (plagioclase >> K-feldspar) with a small nodule of skarnoid rock (garnet+amphibole+magnetite+quartz) was found at locality Račice, Luleč conglomerates, Drahany Hights. Minerals from both rocks...

Illusion known as „Czech Crater“ (book review) The book “Czech Crater” from Petr Rajlich represents a new manipulative and highly speculative type of geological literature in Czech Republic. Without any real evidence, the author presents imaginary Proterozoic impact producing “Czech Crater” of 290×240 km in diameter. The book commonly ignores...

...boudins of various calc-silicate rocks, are enclosed in muscovite-biotite paragneisses. The following types of marbles were distinguished: a) silicates-poor marbles with the assemblage: Cal + Phl + Tr ± Di ± Dol ± Gr; b) silicates-enriched skarnized marbles (sky blue Cal + Ves + Wo ± Grs ± Di ±...

...show transitional contacts with the host syenites to granites. Mineral composition the pegmatites is characterized by dominance of K-feldspar (locally amazonite) over albite, common Mg-rich biotite (phlogopite) but absence of primary muscovite, common Y, REE-bearing minerals (allanite-(Ce), aeschynite and euxenite group minerals) and Ti-bearing minerals (titanite I, ilmenite). Further common...

...contain mainly subangular quartz and quartzite transported over relatively short distances, but well rounded pebbles redeposited from older sediments are also present. During younger transformation, especially in Quaternary age, primary fine-grained strewn-field sediment with short transported moldavites passes into residual gravels. Brown fragments of ferrolite abundantly occur in both localities....

...surrounding mica schists. P-T conditions 600–630 °C and 5–6 kbar calculated from associated mica schist were interpreted as retrograde metamorphism. Chemical composition of tourmaline strongly varies from high X-site vacant Al-rich schorl to dravite which indicate tourmaline growths over a range of P-T-X conditions. Tourmaline shows three distinct compositional domains...

...multiphase regional metamorphism. Part of scapolite is clearly later mineral which replaces plagioclase; albite, chlorite, vermiculite, rare pumpellyite-(Al) and illitesmectite are the youngest retrograde minerals. High Na/K and Mg/Fe ratio and very low content of TiO2 and P2O5 characterise the whole chemical composition of the rock. The studied layers are...

Hydromagnesite, brugnatellite and coalingite in mineral assemblage of fissures in serpentinite, quarry „U Pustého mlýna“, Hrubšice, Moldanubian zone, western Moravia Low-temperature fissure mineralization was found in the quarry “U Pustého mlýna” (the Hrubšice serpentinite body, Moravian Moldanubicum). It is formed by rare Mg-, Mg–Fe-hydrocarbonate minerals (hydromagnesite, artinite, brugnatellite, coalingite), followed...

...tremolite, Zn-spinel, apatite, sphalerite, fluorite and ilmenite. Somewhat similar occurrence of baddeleyite is recorded from clinohumite-rich calcite marble from Malenice near Volyně. Geikielite from Velké Hydčice and Rabí contains dominantly ca. 60 mol. % geikielite and 40 % ilmenite, ilmenites from Cudrovice and Malenice are magnesian ilmenites. Hydroxylclinohumite, forsterite and...

...districts. The most abundant supergene minerals (except for Fe-oxo hydroxides) are jarosite, gypsum, cerusite, anglesite, pyromorphite and malachite, occurring in almost all districts. Only in the Štěpánov ore district also brochantite and sporadic yellow Pb-Cu-Sb ochres are relatively common along with malachite, in the Brod ore district schwertmannite, scorodite, pharmacosiderite...

Unique chondrodite-bearing mineral assemblage in marble at Bílá Hill near Čechočovice (western Moravia) In the large body of pure calcite marble in the biotite paragneiss of Moldanubicum very rare chondrodite was found. It occurs in narrow limited layer of marble low in dolomite and silicate grains (<1 vol%) in assemblage...

...Western Moravia REE-bearing calcite marble forms a layer in biotite phyllites near H. Dunajovice in the Lukov Unit of Moravicum. Chemical compositions of the iron- and phyllosilicate-rich marbles and description of rare carbonate synchysite-(Ce) are presented. Enrichment of REE in marble became in its sedimentary diagenetic or early metamorphic stages....

Cl-rich hydroxylellestadite from Zastávka near Brno At burning mine dumps of abandoned mines at Zastávka near Brno (southern Moravia), Czech Republic, was found mineral from the ellestadite group – Cl-rich hydroxylellestadite. It forms rare pale blue transparent acicular crystals, up to I mm in length, and rich bright blue fine-grained...

...composition; (ii) carbonate and carbonate-silicate rocks along regional faults; (iii) direct intrusive contacts between marble and aplite or pegmatite; (iv) quartz veins and contacts with pegmatite in Fe-skarn; (v) various silicate or carbonate-silicate rocks in contact envelope of large granitoid plutons. Vesuvianite-bearing mineral assemblages commonly include grossular, quartz and calcite,...

Almandine quartzite from Chotěbudice near Jemnice, western Moravia Almandine-rich quartzite with accessory gahnite was found SW of Chotěbudice near Jemnice in Western Moravia. A description of the mineral assemblage as well as a brief comparison with other quartzites in Western Moravia are given....

...The host rock complexes consist of dominant metapelites (mica schists, gneisses) with common intercalations of quartzites, marbles, minor metabasites and graphite-rich rocks, Tremolite marbles form relatively thin layers within large metacarbonate bodies or relatively small individual lenses. Two compositional types were recognized, calcite- and dolomite-dominant, respectively. Typical mineral assemblages are...

Segnitite from Štěpánov nad Svratkou, western Moravia Rare Pb-Fe arsenate segnitite was found among supergene minerals from Ag-Pb-Zn deposit Havírna near Štěpánov nad Svratkou, western Moravia. The X-ray powder diffraction pattern, unit cell parameters and chemical composition are given....

...methods. Mineral assemblage, chemical compositions of rock and vanadium-bearing muscovite is similar to those from the localities of graphitic quartzites from the Variegated Group of the Moldanubicum. The pebble of graphitic quartzite is the first evidence of the presence of rocks from the Variegated Group in the Upper Viséan conglomerates....

Pb-Zn mineralization near Horní Loučky in vicinity of Tišnov Pb-Zn mineralization Horní Loučky near Tišnov is described. Simple mineral assemblage with sphalerite and galena is disseminated in quartzite, which replaced of marbles of the Olešnice Unit, Moravicum....

Barium phlogopite and kinoshitalite-bearing mineral assemblage of forsterite marbles from Rožná uranium deposit, Moldanubicum, western Moravia Ore-bearing dolomite marbles with rare Ba-micas (kinoshitalite, Ba-phlogopite) were studied in uranium deposit Rožná. Mineral assemblage, chemical composition of minerals and metamorphism of marbles are presented....

Mineralogy, ore deposit situation and history of the Štěpánov ore district in the Western Moravia The Štěpánov ore district produced Ag, Pb and Cu ore since half of 13th century, Two types of silver-bearing polymetallic mineralization in the surroundings of Štěpánov nad Svratkou in the NW part of Svratka Dome...

Allanite and its alteration products from pegmatite and skarn near Rešice, Western Moravia, Czech Republic Allanite-(Ce) occurs in pyroxene (± garnet; plagioclase) skarn and in pegmatite dykes cutting regionally metamorphosed iron skarn body near Rešice. The results of microscopic study and microprobe analyses of allanite and its alteration products (parisite,...

...silicate-poor calcite marbles. The clasts of graphite-bearing marbles (i) and (ii) suggest the presence of rocks from the Vranov and Olešnice Group in the Upper Viséan conglomerates. Provenance of (iii) graphite-free calcite marbles associated with phyllites in matrix of large clasts is very likely related to unspecified low-grade metamorphic unit....

...core-margin zone and (vi) quartz core surrounded and in part penetrated by (vii) albite-lepidolite complex. Late fracture-filling tourmaline veins were found particularly in the (ii), (iii) and (iv) units. The most abundant minerals include quartz, K-feldspars and albite. Micas (biotite, muscovite, lepidolite) and tourmaline (schorl, foitite, elbaite, rossmanite, dravite) are...

Moldavite from Moravské Bránice (Moravia, Czech Republic) Moldavite was found in Moravské Bránice near Brno. On the basis of the chemical composition, it corresponds to the ferrous moldavites. Shape and surface of moldavite as well as geological position of the new occurrence are discussed....

Evolution of chemical composition of tourmaline from the peraluminous orthogneisses from Olešenka, NE Moldanubian unit Medium-grained porphyroclastic, garnet-biotite to biotite-muscovite orthogneiss with tourmaline from Olešenka consist of quartz, K-feldspar (P up to 0.02 apfu and Na up to 0.14 apfu), plagioclase (An7–9) and small amount mafic minerals. Biotite (Al 3.52–3.76...

Chromium-bearing spinel – illite mineral assemblage in quartz rock from Radňoves near Křižanov (Gföhl Unit, Moldanubian Zone, Bohemian Massif) Fine-grained quartz rock was found near the southern contact of the garnet-spinel-orthopyroxene serpentinized peridotite body enclosing in the granulites and gneisses of the Gföhl unit (Moldanubian Zone). It is regularly grained,...

...of the Boskovice Basin. The dominant almandine garnets Alm65–85 Prp13–18 Sps1–2 Grs1–5 can be traced to gneisses and mica-schists of the adjacent geological units. Minor pyrope dominant garnets Prp68–71 Alm13–20 Grs11–12 Uvt5–9 Sps1–2 come from serpentinized peridotites. Both types of garnets were affected by intrastratal dissolution and exhibit significant oriented...

...size, were formed in similar way as some fulgurites. Pseudofulgurite is brown-black in color, with numerous bubbles of the order of mm in size, in the case of tubular shapes with a central rounded and square channel. It consists of several types of glasses, including rare lechatelierite. They contain sporadically...

...assemblage each studied samples indicates minimal source area (maximum a few km2). The igneous and metamorphic rocks of the Brno Massif represent the main source of material for clastic sediments within the studied streams. Gold is associated with pyrite and is probably related to hydrothermal quartz veins or alteration zones....

Mineralogy of titanite-rich nodules from biotite granite of Tábor Pluton (Moldanubicum, Dražičky near Tábor quarry, Central Bohemia) The elongated body of biotite granite with titanite-rich nodules is situated on the contact of amphibole-biotite and amphibole-pyroxene melasyenites of the Tábor pluton. Titanite-rich nodules are spherical, 1 to 3 cm in diameter...

...X-ray and chemical studies. The serpentine is represented by Al- and Fe-poor lizardite (~0.01 apfu Al; 0.01–0.05 apfu Fe). The Mg-chlorite belongs to the clinochlore (so-called pseudophite), which, in addition to the significant content of Al (1.54–2.32 apfu), has variable content of Fe (0.03–1.07 apfu) and relatively low contents of...

...former small quarry and in 1950s they were also found in the Peklo medieval mine close to the Stříbrné Hory village. These rocks contain unsorted pebbles mostly of Moldanubian paragneisses, migmatites, granites, microgranites, lamprophyres and quartz from the surroundings rock units. The original greywacke matrix consisting of aleuropelitic material and...