2019/10/22 by Oleg I. Siidra, Еvgeny V. Nazarchuk, Anatoly N. Zaitsev +1 · 1 citation
Materials Science · Chemistry · #Crystal Structures and Properties #Solid-state spectroscopy and crystallography #Inorganic Fluorides and Related Compounds
paper · doi:10.1180/mgm.2019.68
openalex publication_date 2019/10/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/05/21
Abstract A new mineral majzlanite, ideally K 2 Na(ZnNa)Ca(SO 4 ) 4 , was found in high-temperature exhalative mineral assemblages in the Yadovitaya fumarole, Second scoria cone of the Great Tolbachik Fissure Eruption (1975–1976), Tolbachik volcano, Kamchatka Peninsula, Russia. Majzlanite is associated closely with langbeinite and K-bearing thénardite. Majzlanite is grey with a bluish tint, has a white streak and vitreous lustre. The mineral is soluble in warm water. Majzlanite is monoclinic, C 2/ c , a = 16.007(2), b = 9.5239(11), c = 9.1182(10) Å, β = 94.828(7)°, V = 1385.2(3) Å 3 and Z = 16. The eight strongest lines of the X-ray powder diffraction pattern are [ d , Å ( I , %)( hkl )]: 3.3721(40)( 3 12), 3.1473(56)( 4 02), 3.1062(65)( 2 22), 2.9495(50)( 1 31), 2.8736(100)( 1 13), 2.8350(70)(421), 2.8031(45)(511) and 2.6162(41)( 5 12). The following structural formula was obtained: K 2 Na(Zn 0.88 Na 0.60 Cu 0.36 Mg 0.16 )(Ca 0.76 Na 0.24 )(S 0.98 Al 0.015 Si 0.005 O 4 ) 4 . The chemical composition determined by electron-microprobe analysis is (wt.%): Na 2 O 9.73, K 2 O 15.27, ZnO 11.20, CaO 7.03, CuO 4.26, MgO 1.07, Al 2 O 3 0.47, SO 3 51.34, SiO 2 0.12, total 100.49. The empirical formula calculated on the basis of 16 O apfu is K 1.99 Na 1.93 Zn 0.84 Ca 0.77 Cu 0.33 Mg 0.16 (S 3.94 Al 0.06 Si 0.01 )O 16 and the simplified formula is K 2 Na(Zn,Na,Cu,Mg) Σ2 (Ca,Na)(SO 4 ) 4 . No natural or synthetic compounds directly chemically and/or structurally related to majzlanite are known to date. The topology of the heteropolyhedral framework in majzlanite is complex. An interesting feature of the structure of majzlanite is an edge-sharing of ZnO 6 octahedra with SO 4 tetrahedra.