Historie dolování, ložisková geologie a mineralogie některých lokalit v novoknínské zlatonosné oblasti (střední Čechy) Vladimír Šrein, Jiří Sejkora, Jiří Litochleb, Blanka Šreinová The Nový Knín area represents besides the Jílové gold-bearing district the second very significant gold-bearing region in the central Bohemia (Czech Republic). This paper summarizes hitherto knowledge about mining history, economic geology and mineralogy of some localities in the Nový Knín…
Minerálne inklúzie v beryle, živcoch a kremeni z granitového pegmatitu Moravany nad Váhom - Striebornica (Považský Inovec, západné Slovensko): chemické zloženie a genetické aspekty Pavel Uher, Daniel Ozdín Numerous microscopic inclusions of cassiterite, ferrotapiolite (?), „hydroxycalciomicrolite“, gahnite, magnetite, fluorapatite, barite, pyrite, sphalerite, galena, muscovite, and bertrandite or phenakite occur in coarse-grained beryl, microcline, albite and quartz from the core zone of the Moravany…
Mladopaleozoické vulkanity Žatecka, sz. Čechy Zdeněk Řanda, Ferry Fediuk A series of bore holes around the town of Žatec revealed a large complex of Permo-Carboniferous (Gzhelian - Asselian) mafic volcanics 150 to 400 m beneath the Tertiary and Cretaceous sedimentary cover. The extent of it is estimated to 80 km2 with the maximum thickness of 53 m consisting of several…
Hörnesit z Mikulova v Krušných horách (Česká republika) Michal Řehoř, Petr Pauliš, Zdeněk Dvořák, Miroslav Radoň Supergene hydrated magnesium arsenate, hörnesite, was recently found on the historical Ag-deposit Mikulov in the Krušné hory Mountains (Czech Republic). Hörnesite forms there white, radial to hemispherical or irregular acicular to disc-like aggregates with pearly lustre up to 7 mm. Hörnesite…
Sn-Ti mineralizace z revíru Krupka v Krušných horách (Česká republika) Zdeněk Losos, Jiří Škovíra, Jiří Sejkora, Jiří Litochleb The unusual Sn-Ti mineralization was found at the Krupka ore district, Krušné hory Mountains, Czech Republic. Anatase occurs there in three morphological types: anatase 1 forms bluish grey, grey to brown tabular crystals up to 1 mm in size which forms together with chlorite pseudomorphs after…
Hnedý ihličkovitý dravit z mastencovo-magnezitového ložiska Gemerská Poloma (gemerikum, Slovensko) Peter Bačík, Ivan Dianiška, Martin Števko, Peter Sečkár Brown tourmaline was found on the Gemerská Poloma talc-magnesite deposit. Fibrous tourmaline forms aggregates along with talc on the slip surface of carbonate rock containing dolomite, magnesite and accessory fluorapatite. Tourmaline (dravite) is almost homogeneous with very high XMg (0.95 - 0.96),…
Walpurgin z uranového ložiska Medvědín, Krkonoše (Česká republika) Radek Škoda, Pavel Škácha, Ivana Jebavá, Josef Plecháček, Jiří Sejkora, Jakub Plášil, Karla Fejfarová Rare supergene Bi-uranyl arsenate, walpurgite, was found in material from the vein No. 18 at the abandoned adit No. 1 at the Medvědín uranium deposit, Krkonoše Mountains, northern Bohemia, Czech Republic. Walpurgite occurs there as bright yellow tabular crystals with characteristic greasy to…
Epidot z metabazaltov malužinského súvrstvia na lokalitách Lošonec a Sološnica v Malých Karpatoch (Slovensko) Peter Bačík, Marek Vďačný, Daniel Ozdín, Ján Kromel, Peter Ružička Epidote was found in Permian rift-related metabasalts in two localities near Lošonec and Sološnica, Malé Karpaty Mountains, SW Slovakia. It occurs in association with calcite, albite, clinochlore and titanite and forms fillings of veins and also smaller scattered veinlets cutting basalts. Epidote is…
