Nannoniite, Al2(OH)5F, a new mineral from the Cetine di Cotorniano mine (Tuscany, Italy)
The new mineral nannoniite, Al2(OH)5F (Z=4), has been discovered in the Cetine di Cotorniano mine, Chiusdino, Siena, Tuscany, Italy. It occurs as spherical aggregates formed by micrometre-sized crystals, colourless to white in colour, with a white streak and a vitreous to earthy lustre. Fluorescence...
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Veröffentlicht in: | European journal of mineralogy (Stuttgart) 2024-12, Vol.36 (6), p.1011-1022 |
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Sprache: | eng ; fre |
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Zusammenfassung: | The new mineral nannoniite, Al2(OH)5F (Z=4), has been discovered in the Cetine di Cotorniano mine, Chiusdino, Siena, Tuscany, Italy. It occurs as spherical aggregates formed by micrometre-sized crystals, colourless to white in colour, with a white streak and a vitreous to earthy lustre. Fluorescence is bluish-yellow and yellowish-white under short- and longwave UV radiation, respectively. Electron microprobe analysis gave (in wt %) SO3 0.49, Al2O3 63.97, MgO 0.51, CaO 0.22, K2O 0.07, F 11.72, H2O(calc) 28.54, and -O = F -4.94, with a total of 100.58. Nannoniite is monoclinic, with space group P21/n and with a=8.688(3), b=5.024(2), c=9.734(4) Å, β=90.77(2)°, and V=424.9(3) Å3. The crystal structure was solved using three-dimensional electron diffraction and refined to R(obs)=0.1524 for 2141 unique reflections with I>3σ(I). Nannoniite is homeotypic with gibbsite. In type material, nannoniite is associated with quartz, baryte, gypsum, and alunite in vugs of a silicified limestone. Its origin is probably related to the late-stage circulation of (Al,F)-rich fluids within the Sb ore deposit formerly exploited at the Cetine di Cotorniano mine. |
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ISSN: | 0935-1221 1617-4011 |
DOI: | 10.5194/ejm-36-1011-2024 |