Abstract
Rusinovite, Ca10(Si2O7)3Cl2, was found at two new localities, including Shadil-Khokh volcano, South Ossetia and Bellerberg volcano, Caspar quarry, Germany. At both of these localities, rusinovite occurs in altered carbonate-silicate xenoliths embedded in volcanic rocks. The occurrence of this mineral is connected to specific zones of the xenolith characterized by a defined Ca:Si < 2 ratio. Chemical compositions, as well as the Raman spectra of the investigated rusinovite samples, correspond to the data from the locality of rusinovite holotype—Upper Chegem Caldera, Northern Caucasus, Russia. The most intense bands of the Raman spectra are related to vibrations of (Si2O7) groups. Unit cell parameters of rusinovite from South Ossetia are: a = 3.76330(4) Å, b = 16.9423(3) Å, c = 17.3325(2) Å, V = 1105.10(4) Å3, Z = 2. The performed synchrotron radiation diffraction experiments did not confirm a doubling of c as reported for the synthetic phase, Ca10(Si2O7)3Cl2. However, one-dimensional diffuse scattering parallel to b* has been observed. This can be interpreted with an ordered arrangement of Si2O7 groups creating layers with a doubled a parameter. Consequently, the two different displacements of neighbouring layers allow random stacking faults to occur.
Highlights
Rusinovite, Ca10 (Si2 O7 )3 Cl2, was found in 2011 in an altered carbonate-silicate xenolith from the Upper Chegem Caldera located in Kabardino-Balkaria, Northern Caucasus, Russia
The main goal of this study is to describe rusinovite from two new localities, including chemical composition and Raman spectroscopy
A small loss of the chlorine content in rusinovite from Shadil-Khokh volcano can be caused by slight hydration or methodological problems of chlorine measurements [1]
Summary
Rusinovite, Ca10 (Si2 O7 ) Cl2 , was found in 2011 in an altered carbonate-silicate xenolith from the Upper Chegem Caldera located in Kabardino-Balkaria, Northern Caucasus, Russia. These rocks are formed at high-temperature and low-pressure conditions (sanidinite facies) and contain different. Ca12 Al14 O32 [(H2 O) Cl2 ] [1,2,3] Besides their natural occurrence, rusinovite-type synthetic phases were described from anthropogenic formations. Rusinovite-type synthetic phases were described from anthropogenic formations Its emission is efficiently excited by the output of near-UV light-emitting diodes (LEDs)
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