Publication Date:
2017-04-04
Description:
The new minerals d’ansite-(Mn), Na21Mn2+(SO4)10Cl3, and d’ansite-(Fe), Na21Fe2+(SO4)10Cl3, 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 I4¯ 3d. 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), Na2O 39.37, MnO 3.46, MgO 0.13, SO3 49.99, Cl 6.36, O=Cl 1.44, total 97.87 wt.%,
c o r r e s p o n d i n g t o a n e m p i r i c a l f o r m u l a , on t h e ba s i s o f 43 a n i o n s , of
Na20.61(Mn2+
0.79Mg0.05)S0.84S10.13O40.09Cl2.91; and d’ansite-(Fe), Na2O 39.12, FeO 4.18, MgO 0.12,
SO3 49.91, Cl 6.81, O=Cl 1.54, total 98.60 wt.%, corresponding to an empirical formula of
Na20.42(Fe2+
0.94Mg0.05)S0.99S10.08O39.89Cl3.11. The six strongest reflections in the X-ray powder
diffraction pattern of d’ansite-(Fe) [listed as dobs(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 〉 2s(I). The structure contains
three independent Na sites, one of which is partially occupied by Mn2+ or Fe2+, two independent sulfate
anions and one chlorine site.
Description:
Published
Description:
2773–2783
Description:
3.6. Fisica del vulcanismo
Description:
JCR Journal
Description:
restricted
Keywords:
d’ansite-(Mn)
;
d’ansite-(Fe)
;
Vesuvius
;
Vulcano Island
;
04. Solid Earth::04.04. Geology::04.04.05. Mineralogy and petrology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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