Minerální asociace fosfátů z Čížové u Písku (Česká republika) Ivana Jebavá, Jaroslav Cícha, Jiří Sejkora An interesting phoshate mineral assemblage was found in temporary open cut 700 m W from Čížová near Písek, southern Bohemia, Czech Republic. Fluorapatite forms abundant white veins up to 1 cm thick and white spherical aggregates in cavities; minor contents of carbonate ions were observed; its…
Výskyt whewellitu v pelosideritoch uhoľného ložiska Handlová (Slovenská republika) Martin Števko, Peter Bačík, Peter Cagáň Whewellite was identified on fissures in central part of pelosiderite concretions and lenses at the Handlová coal deposit. It forms colourless to white crystalline aggregates together with vitreous lustre associated together with crystalline aggregates of quartz and fine-grained pyrite. Rarely well…
Churchit-(Y) z uranového ložiska Zálesí v Rychlebských horách (Česká republika) Svatopluk Civiš, Vlastimil Toegel, Petr Pauliš Relatively rare yttrium phosphate, churchite-(Y), was found at mine dump in the abandoned uranium deposit Zálesí in the Rychlebské hory Mountains (Czech Republic). Churchite-(Y) forms light grey and white-grey globular aggregates up to 0.5 mm in size composed by tiny tabular crystals. Churchite-(Y)…
Meneghinit a boulangerit z lomu Prachovice v Železných horách, Česká republika Jiří Litochleb, Jiří Sejkora, Pavel Škácha, Viktor Venclík, Jakub Plášil Two new primary ore minerals, meneghinite and boulangerite, were found in the active quarry near Prachovice in the Železné hory Mountains, Czech Republic. Both minerals and galena intergrow in silver-grey needle aggregates up to 6 cm on fissures of the silurian and devonian limestones. Meneghinite…
Montroseit z uranového ložiska Licoměřice v Železných horách (Česká republika) Stanislav Kopecký, Petr Pauliš A vanadium mineral montroseite was recently found at the little uranium deposit Licoměřice in the Železné hory Mountains, Czech Republic. This mineral is known from several ore deposits in Czech Massif (Příbram, Rožná) where accompanies uranium ores. At Licoměřice, montroseite forms black…
Chemická variabilita granitu typu Černá kočka čisteckého masivu Josef Franče, Ferry Fediuk The Černá kočka muscovite alkali feldspar granite, occurring on the SE border of the Čistá granitoide massif, has been hitherto chemically characterized by a single analysis only. The present contribution, using 46 new unpublished chemical analyses from a technological report, offers in a series of…
Sfalerit z ložiska Zlaté Hory - Východ (Česká republika) se zřetelnou UV luminiscencí a jeho minerální asociace Jiří Sejkora, Jiří Zimák, Pavel Novotný A UV fluorescent sphalerite was found in the ore gangue from the deposit Zlaté Hory - East in the Jeseníky Mountains (Czech Republic). The ore gangue are represented by muscovite quartzite rich in Ba-feldspar (celsiane) and sulfide minerals, mainly of pyrite. Pyrite is accompanied with sphalerite,…
Stilbit-Ca z amfibolitového kamenolomu Markovice u Čáslavi (Česká republika) Ivana Jebavá, Jaroslav Heřmánek, Petr Pauliš, Lukáš Zahradníček Stilbite-Ca was found in the active Markovice amphibolite quarry near Čáslav (Czech Republic). It crystallizes there as white, yellowish to reddish vitreous aggregates with columnar crystal shape, about 1 mm in the size. The crystals grow in the prehnite pocket which has about 5 cm in diameter.…
Titanit v horninách západního granitoidového komplexu brněnského masivu David Buriánek Paragenetic and chemical variability of minerals from Western Granitoid Complex of the Brno Massif demonstrate wide spectrum of processes that lead to the formation of titanite in metamorphic and igneous rocks. Titanite is a common accessory or secondary mineral in amphibole-biotite to biotite…
Agardit-(Y) z ložiska Sn-W Cínovec v Krušných horách (Česká republika) Jaroslav Kopista, Petr Pauliš, Jiří Sejkora Rare Y-REE copper arsenate, mineral agardite-(Y), was found in the material from the abandoned Sn-W deposit, Krušné hory Mountains, northern Bohemia, Czech Republic. Agardite-(Y) forms very light green hemispherical to spherical aggregates up to 0.2 mm in association with green chrysocolla and…
Křemenné žíly s dumortieritem, andalusitem a dravitem od Psár u Jílového (Česká republika) Jan Cempírek, Jan Loun Dumortierite associated with andalusite, dravite and chlorite were found in quartz veins at Holý vrch Hill near Psáry (central Bohemia, Czech Republic), in rocks belonging to Jílové metavolcanic belt. Two macroscopically distinct varieties of dumortierite were found: dark-violet aggregates of long…
Nové nálezy supergenní mineralizace v havlíčkobrodském rudním revíru (Česká republika) Ivana Jebavá, Stanislav Kopecký, Petr Pauliš The five supergene minerals from individual sites of the Havlíčkův Brod ore district (Czech Republic) are recently identified by PXRD and EDS analyses. They are kaňkite from Mírovka, plumbojarosite from Čistá, pyromorphite and cerussite from Termesivy and scorodite from Ovčín. The origin of…
Hydrotermálny anhydrit z epitermálneho polymetalického ložiska Banská Štiavnica (Slovenská republika) Martin Števko, Peter Bačík 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…
Chemické složení zlata, wolframitu a scheelitu z rozsypů lokality Trucbaba - Valcha u Humpolce Zbyněk Buřival, Zdeněk Losos, Lenka Losertová Chemical analyses of gold, wolframite and scheelite from stream sediments from locality Trucbaba - Valcha near Humpolec, Czech Republic, are presented. Three gold grains were analyzed and revealed as very pure gold with 85 - 99 % Au. Unusual porous structures of gold grains, inclusions of native…
