Fosfáty a doprovodné minerály z živcového lomu Vysoký kámen u Krásna, Česká republika.

Article presents detailed research focused on the new finds of phosphates and associated minerals from the Vysoký Kámen feldspar deposit near Krásno, Slavkovský les area, Czech Republic. It presents an erosional relict of topaz -albite granitic elevation (stock). The main granitic facies were described by various authors as aplogranites, albitites, and alkali feldspar syenites. Magmatic rocks show large scale metasomatic albitization, K-feldspatization, and locally also greisenization. Phosphate accumulations with prevailing triplite are connected to pegmatitoid, possibly greisenized veins. Triplite grains are surrounded by alteration rims of fluorapatite. Large number of phosphates (i.e., leucophosphite, perloffite, frondelite, rockbridgeite, bermanite and possibly also its Fe3+-analogue) are products of triplite alteration. They form veinlets along fissures or grains up to 100 µm, accompanied by fluorite, quartz, and possible manganese oxides. Supergene fissure mineralization with metauranocircite-I, cryptomelane, hollandite, dickite, and baryte present distinct type of mineralization, with no connection to triplite. Metauranocircite-I structure is not very stable and showed continuous transition to metauranocircite-II during the PXRD analysis. [ABSTRACT FROM AUTHOR]