Bulletin Mineralogie Petrologie

Sejkora Jiří, Pauliš Petr, Bureš Bohuslav, Pour Ondřej

Volume 33, issue 2 (2025), pages 194-203

DOI: https://doi.org/10.46861/bmp.33.194

lithiophorite, Ba-rich cryptomelane, hollandite, powder X-ray diffraction data, unit-cell parameters, chemical composition, Kladská, Czech Republic

The mineral association of lithiophorite, cryptomelane/hollandite and hematite in quartz gangue was found in the material from the exploratory trenches in the forest track „U Kutaček“, 4 km NW of Kladská in the cadastre of the town of Lázně Kynžvart (Slavkovský les Mts., Czech Republic). Lithiophorite occurs as massive aggregates up to several cm in size, with a reniform or hemispherical surface. It is opaque, black, sometimes with a greenish or purplish tints. It is trigonal, space group R-3m, with the unit-cell parameters refined from X-ray powder diffraction data: a 2.9158(5), c 28.266(7) Å and V 208.11(7) ų. Its chemical analyses (mean of 26 points) correspond to the empirical formula (Al_0.66 Li_0.27Cu_0.03Co_0.03Zn_0.01)_Σ1.00(Mn_0.98Si_0.02)_Σ1.00O₂(OH)_2.06 on the basis of 2 cations apfu. Barium-rich (up to 0.24 apfu Ba) cryptomelane forms aggregates up to several cm in size, with a reniform or hemispherical surface. It is opaque, black, sometimes with a greenish or purplish tints. It is tetragonal, space group I4/m, with the unit-cell parameters refined from X-ray powder diffraction data: a 9.828(2), c 2.8497(9) Å and V 275.26(13) ų. Its aggregates are distinctly zonal due to variable Ba and Al contents; thin zones corresponding to hollandite and not yet approved phases alumocryptomelane and alumohollandite were observed. In the material with Mn-minerals, abundant coatings and spherical aggregates of hematite were observed. Hematite is trigonal, space group R-3c, with the unit-cell parameters refined from X-ray powder diffraction data: a 5.0369(2), c 13.7571(7) Å and V 302.26(2) ų.

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https://mapy.geology.cz/dulni_dila_poddolovani; přístup 20. 8. 2025