Crystal structure model of sodium-depleted sacrofanite. Problem of the sacrofanite identification

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Abstract

A structural model of the sodium-depleted analogue of sacrofanite, a 28-layer mineral of the cancrinite group with the empirical formula (Na3.18Ca2.81K1.93)(Si6.10Al5.83Fe0.07O24)(SO4)1.95F0.51Cl0.19(OH)0.23·0.155H2O from sanidine syenite of the Sacrofano paleovolcano, Latium, Italy was obtained. The studied mineral is hexagonal, space group P-62с; the unit cell parameters [a = 12.90519(13), с = 74.2181(10) Å, V = 10704.6(3) Å3] are close to those of holotype sacrofanite. The aluminosilicate framework of the studied sodium-depleted sacrofanite contains columns of zeolitic cavities of four types (cancrinite, sodalite, Losod, and liottite ones). Their presence is confirmed by IR spectroscopy data, unlike holotype sacrofanite whose published IR spectrum does not contain characteristic band of liottite cage at 547±4 cm-1.

About the authors

N. V. Chukanov

Moscow State University; Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry RAS

Author for correspondence.
Email: zrmo@minsoc.ru

Faculty of Geology

Russian Federation, Vorobievy Gory, Moscow, 119991; Chernogolovka, Moscow Oblast

N. V. Zubkova

Moscow State University

Email: zrmo@minsoc.ru

Faculty of Geology

Russian Federation, Vorobievy Gory, Moscow, 119991

I. V. Pekov

Moscow State University; Vernadsky Institute of Geochemistry and Analytical Chemistry RAS

Email: zrmo@minsoc.ru

Faculty of Geology

Russian Federation, Vorobievy Gory, Moscow, 119991; Kosygina str. 19, Moscow, 119991

D. A. Ksenofontov

Moscow State University

Email: zrmo@minsoc.ru

Faculty of Geology

Russian Federation, Vorobievy Gory, Moscow, 119991

D. Yu. Pushcharovsky

Moscow State University

Email: zrmo@minsoc.ru

Faculty of Geology

Russian Federation, Vorobievy Gory, Moscow, 119991

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