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Ammoniovoltaite a new mineral from Severo-Kambalny geothermal field, Southern Kamchatka, Russia

RMS-DPI code:  2017-1-245-0
Scientific session:  6. Mineral diversity and evolution of mineral formation processes.
Author listing:  Zhitova E.S., Siidra O.I., Nuzhdaev A.A., Ismagilova R.M., Belakovskiy D.I., Shilovskikh V.V.
Principal author:  Zhitova Elena Sergeevna
Language:  Russian
Abstract - Summary 
(short description):
Ammoniovoltaite, (NH4)2Fe2+5Fe3+3Al(SO4)12(H2O)18, is a new voltaite-group mineral. The mineral was discovered at Severo-Kambalny geothermal field, Kambalny volcanic ridge, Southern Kamchatka, Russia. Ammoniovoltaite forms at ~ 100C around geothermal gas-steam vents in association with alunogen, tschermigite and pyrite. Crystals of ammoniovoltaite have euhedral habit up to 50 m wide and grow on alunogen plates. Ammoniovoltaite is black with vitreous luster, opaque, brittle and water-soluble. Neither cleavage nor parting is found, the fracture is concoidal. The mineral is isotropic, the refractive index n =1.602(2) (589 nm). Infrared spectra contain absorption band at 1433 cm-1 distinctive for ammonium ion. The chemical composition is (iron content is given in accordance with Mössbauer data, H2O calculated by structure refinement, wt. %): FeO 13.26, Fe2O3 11.58, MgO 2.33, ZnO 0.04, Al2O3 2.74, SO3 47.46, K2O 0.19, CaO 0.11, (NH4)2O 2.96, H2O 16.66, total 97.33. The empirical formula based on S = 12 atoms per formula unit is [(NH4)1.88K0.08Ca0.04]Σ2.00(Fe2+3.74Mg1.17Fe3+0.05Zn0.01)Σ4.97(Fe3+2.89Al0.09)Σ2.98Al1.00(SO4)12.00(H2O)18.72. The crystal structure has been refined to R1 = 0.0361 on the basis of 1217 unique reflections with I >2σ(I). Ammoniovoltaite is cubic, Fd-3c, a = 27.250(1) Å, V = 20234(2) Å3, Z = 16. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 9.67 (74) (022), 7.90 (56) (222), 5.58 (84) (224), 3.560 (100) (137), 3.418 (100) (008), 2.8660 (37) (139). A brief review of ammonium minerals from various volcanically active geological environments is given.

Keywords: ammoniovoltaite; sulphate; ammonium; new mineral; voltaite group; geothermal field; Kambalny volcano
RMS-DPI code:  2017-1-245-0
Pages:  216-217
File of proceedings 
 120 K
Status:  printed
Recieved:  27/08/2017
Accepted:  16/09/2017
Published on-line:  07/12/2017
Permanent address of publication:  http://www.minsoc.ru/2017-1-245-0/
Contact author(s):  Zhitova, Elena Sergeevna
site administrator: adminminsoc.ru (Docent Morozov, Mikhail)
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