ISSN
print 2570-7337
online 2570-7345
Secondary phosphates from the feldspar deposit Veselá hora near Domažlice (Czech Republic)
Keywords
Abstract
Within the research of secondary phosphates of the Bohemian Massif, an interesting phosphate mineralization was found on a historical sample from the Veselá hora pegmatite deposit near Domažlice (Czech Republic). Jahnsite-(CaMnFe), jahnsite-(MnMnFe), frondelite, messelite-fairfieldite, mitridatite, Mn-rich fluorapatite and parafiniukite were detected in a sample collected in the year 1944, at the time of feldspar mining in the Veselá Hora deposit. Older jahnsite forms flat elongated yellow-orange crystals, up to 2 mm in size in cavities of the phosphate matrix; its chemical composition ranges from jahnsite-(CaMnFe) to jahnsite-(MnMnFe). Younger jahnsite-(CaMnFe) was observed in flat crystals with vitreous lustre and light brown-orange to pink-orange colour. The structural data for both generations are very similar. The mineral is monoclinic, space group P2/a, the unit-cell parameters refined from X-ray powder diffraction data are: a 15.009(3), b 7.1515(16), c 9.873(3) Å, β 111.1(5)° and V 988.4(3) Å3. Frondelite occurring in the cavity forms very dark green to black hemispherical aggregates, up to 1 mm in size, composed of radially arranged fibres. Frondelite is orthorhombic, space group Bbmm, the unit-cell parameters refined from X-ray powder diffraction data are: a 13.828(5), b 16.960(6), c 5.175(2) Å and V 1214.7(5) Å3. Members of the messelite-fairfieldite solid solution were observed as yellowish grains and aggregates associated with mitridatite, Mn-rich fluorapatite, parafiniukite, jahnsite-(CaMnFe) and quartz. It is triclinic, space group P-1, the unit-cell parameters refined from X-ray powder diffraction data are: a 5.476(4), b 5.763(3), c 6.566(2) Å, α 90.19(4)°, β 102.58(5)°, γ 108.45(4)° and V 988.4(3) Å3. The results of the WDS analyses and empirical formulas of all described phosphates are given in the paper.
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References
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