2018/05/15 by Oleg I. Siidra, Еvgeny V. Nazarchuk, Evgeniya A. Lukina +2 · 1 citation
Materials Science · Environmental Science · #Crystal Structures and Properties #X-ray Diffraction in Crystallography #Chemical Synthesis and Characterization
paper · doi:10.1180/minmag.2017.081.084
openalex publication_date 2018/05/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/05/21
ABSTRACT Belousovite, ideally KZn(SO 4 )Cl, was found in a Yadovitaya fumarole of the Second scoria cone of the North Breach of the Great Tolbachik Fissure Eruption (1975–1976), Tolbachik volcano, Kamchatka Peninsula, Russia. Belousovite occurs as irregularly-shaped grains and in the form of microcrystalline masses associated with kamchatkite, langbeinite, euchlorine, anglesite and zincite. Belousovite is monoclinic, P 2 1 /c , a = 6.8904(5), b = 9.6115(7), c = 8.2144(6) Å, β = 96.582(2), V = 540.43(7) Å 3 and Z = 4 (from single-crystal diffraction data). The eight strongest lines of the powder X-ray diffraction pattern are [ d meas Å( I )( hkl )]: 6.8451(100)(100), (3.6401)(71)( 1 21), (3.1592)(84)(1 1 2), (3.1218)(41)( 2 11), (3.1140)(52)(022), (2.9812)(41)(031), (2.9121)(44)(130) and (2.0483)(19)( 3 12). The chemical composition determined by the electron-microprobe analysis is (wt.%): K 2 O 19.55, Rb 2 O 0.58, ZnO 34.85, SO 3 34.65, Cl 14.77, –O = Cl 2 3.34, total 101.06. The empirical formula based on O + Cl = 5 apfu is K 0.97 Rb 0.01 Zn 1.00 S 1.01 O 4.03 Cl 0.97 . The simplified formula is KZn(SO 4 )Cl. The crystal structure was solved by direct methods and refined to R 1 = 0.029 on the basis of 1965 independent observed reflections. The structure of belousovite consists of infinite [ZnSO 4 Cl] – layers and K + ions. [ZnSO 4 Cl] – layers are formed by corner sharing mixed-ligand ZnO 3 Cl tetrahedra and SO 4 tetrahedra. The topology of [ZnSO 4 Cl] – layers in belousovite is identical to [Si 4 O 10 ] 4– layers in the minerals of the apophyllite group. A review of mixed-ligand ZnO m Cl n coordination polyhedra in minerals and inorganic compounds is given.