Crystal structure and raman spectroscopy of synthetic potassium Richterite

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Abstract

The structures of two potassium richterite crystals with crystal chemical formulas (K0.44Na0.32□0.24)Σ=1(Ca1.18Na0.82) were studied by single-crystal X-ray diffraction analysis and Raman spectroscopy (RAMAN)Σ=2Mg5Si8O22OH2 and (K0.83Na0.02□0.15)Σ=1(Ca1.18Na0.89)Σ=2Mg5Si8O22OH2 synthesized at a pressure of 3 GPa and a temperature of 1000°C in the MgSiO3+CaMgSi2O6+K2CO3+Na2CO3+CO2+ +H2O system. The parameters of monoclinic cells are obtained: a=10.0256(5) & 9.9748(11), b=17.9874(7) & 17.9879(16), c=5.2687(3) & 5.2746(6) Å, Vu.c. = 916.17(18) & 918.52(8) Å3, β = 104.520(12)o & 104.821(5)o, sp. gr. С2/m (12), Z = 2. It was found that positions M(1), M(2) and M(3) are inhabited by Mg2+, position M(4) is occupied simultaneously by Ca2+ and Na+. The Na+ cations that are not included in M(4) are located in position A, which also accommodates K+ cations. Raman spectroscopy showed the presence of vacancies in position A in both samples. The structure corresponds to the “ideal” structure of richterite group minerals. The unit cell volumes of the measured crystals are directly proportional to the content of K in position A. Based on the generalization of new and published data, an equation of dependence of Vu.c. fоr amphiboles of the richterite Na(NaCa)Mg5Si8O22(OH)2–K-richterite K(NaCa)Mg5Si8O22(OH)2 series with a low tremolite component on the K content in position A is proposed.

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About the authors

E. V. Limanov

D.S. Korzhinsky Institute of Experimental Mineralogy, Russian Academy of Sciences

Author for correspondence.
Email: spivak@iem.ac.ru
Russian Federation, Chernogolovka

V. G. Butvina

D.S. Korzhinsky Institute of Experimental Mineralogy, Russian Academy of Sciences

Email: spivak@iem.ac.ru
Russian Federation, Chernogolovka

O. G. Safonov

D.S. Korzhinsky Institute of Experimental Mineralogy, Russian Academy of Sciences; M.V. Lomonosov Moscow State University

Email: spivak@iem.ac.ru
Russian Federation, Chernogolovka; Moscow

A. V. Spivak

D.S. Korzhinsky Institute of Experimental Mineralogy, Russian Academy of Sciences

Email: spivak@iem.ac.ru
Russian Federation, Chernogolovka

A. V. Kuzmin

D.S. Korzhinsky Institute of Experimental Mineralogy, Russian Academy of Sciences; Yu.A. Osipyan Institute of Solid State Physics, Russian Academy of Sciences

Email: spivak@iem.ac.ru

аcademician of the RAS

Russian Federation, Chernogolovka; Chernogolovka

L. Ya. Aranovich

D.S. Korzhinsky Institute of Experimental Mineralogy, Russian Academy of Sciences; Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences

Email: spivak@iem.ac.ru
Russian Federation, Chernogolovka; Moscow

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2. Fig. 1. SEM photographs of K-richterite crystals from the products of experiments II-40 and III-60 in the system MgSiO3+CaMgSi2O6+ +K2CO3+Na2CO3+CO2+H2O [7].

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3. Fig. 2. Crystal structure of synthetic potassium richterite (this work).

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4. Fig. 3. Raman spectra in the range of 100–4000 cm–1 of synthetic K-richterites, processed using the Fityk 1.3.1 and Origin2021 software packages.

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5. Fig. 4. Dependences of the V e. y. of amphiboles of the richterite–K-richterite series on the K content in position A. Data points: orange [2, 9], green [3], black [18, 19], large red – this work. Dashed lines – approximations presented by equations (2–4), see text.

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