D'ansite-(Mn), Na_(21)Mn~(2+)(SO_4)_(10)Cl_3 and d'ansite-(Fe), Na_(21)Fe~(2+)(SO_4)_(10)Cl_3, two new minerals from volcanic fumaroles

摘要

The new minerals d'ansite-(Mn), Na_(21)Mn~(2+)(SO_4)_(10)Cl_3, and d'ansite-(Fe), Na_(21)Mn~(2+)(SO_4)_(10)Cl_3, occur as encrustations in fumaroles at Vesuvius, Naples, Italy and La Fossa crater, Vulcano, Aeolian Islands, Italy, respectively. Both minerals are cubic and crystallize in space group 143d. D'ansite-(Mn) forms colourless translucent tristetrahedral crystals up to 0.2 mm on edge; d'ansite-(Fe) forms aggregates of colourless to white complex isometric crystals of about the same size. Chemical analyses obtained by energy-dispersive spectrometry on an electron microprobe gave the following mean compositions: d'ansite-(Mn), Na_2O 39.37, MnO 3.46, MgO 0.13, SO_3 49.99, Cl 6.36, O=C1 -1.44, total 97.87 wt.%, corresponding to an empirical formula, on the basis of 43 anions, of Na_(20.61)(Mn_(0.79)~(2+)Mg_(0.05))∑_(0.84)S_(10.13)O_(40.09)Cl_(2.91); and d'ansite-(Fe), Na_2O 39.12, FeO 4.18, MgO 0.12, SO_3 49.91, Cl 6.81, O=C1 -1.54, total 98.60 wt.%, corresponding to an empirical formula of Na_(20.42)(Fe_(0.94))~(2+)Mg_(0.05))∑_(0.99)S_(10.08)O_(39.89)Cl_(3.11)- The six strongest reflections in the X-ray powder diffraction pattern of d'ansite-(Fe) [listed as d_(obs)(A) (I) (hkl)] are as follows: 2.807(100)(044), 2.570(37)(235), 1.714(29)(129), 3.384(27)(233), 3.113(26)(134), 2.108(15)(237). The unit-cell parameters obtained from single-crystal data are 15.9291(9) and 15.882(3) A for d'ansite-(Mn) and d'ansite-(Fe), respectively. The structure of both minerals was refined, using single-crystal diffraction data, to final R parameters of 0.0309 and 0.0336 on reflections with I> 2σ(I). The structure contains three independent Na sites, one of which is partially occupied by Mn~(2+) or Fe~(2+), two independent sulfate anions and one chlorine site.