Calcinaksite, KNaCa(Si4O10) H2O, a new mineral from the Eifel volcanic area, Germany
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- 作者：Nikita V. Chukanov ; Sergey M. Aksenov ; Ramiza K. Rastsvetaeva…
- 刊名：Mineralogy and Petrology
- 出版年：2015
- 出版时间：August 2015
- 年：2015
- 卷：109
- 期：4
- 页码：397-404
- 全文大小：988 KB
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Taylor HFW (1997) Cement chemistry. Thomas Telford Ltd edition, London - 作者单位：Nikita V. Chukanov (1)
Sergey M. Aksenov (2)
Ramiza K. Rastsvetaeva (2)
Günter Blass (3)
Dmitry A. Varlamov (4)
Igor V. Pekov (5)
Dmitry I. Belakovskiy (6)
Vladislav V. Gurzhiy (7)
1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow Region, 142432, Russia
2. Institute of Crystallography, Russian Academy of Sciences, Leninsky Prospekt 59, Moscow, Russia, 117333
3. Merzbachstrasse 6, 52249, Eschweiler, Germany
4. Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow Region, 142432, Russia
5. Faculty of Geology, Moscow State University, Vorobievy Gory, 119991, Moscow, Russia
6. Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt 18-2, Moscow, 119071, Russia
7. Faculty of Geology, St Petersburg State University, University Embankment 7/9, St Petersburg, 199034, Russia - 刊物类别：Earth and Environmental Science
- 刊物主题：Earth sciences
Mineralogy
Geochemistry - 出版者：Springer Wien
- ISSN：1438-1168
文摘
The new mineral calcinaksite, ideally KNaCa(Si4O10)?·?H2O, the first hydrous and Ca-dominant member of the litidionite group, is found in a xenolith of metamorphosed carbonate-rich rock from the southern lava flow of the Bellerberg volcano, Eastern Eifel region, Rheinland-Pfalz, Germany. It is associated with wollastonite, gehlenite, brownmillerite, Ca2SiO4 (larnite or calcio-olivine), quartz, aragonite, calcite, jennite, tobermorite and ettringite. Calcinaksite occurs as clusters of colourless to light-grey subhedral prismatic crystals. The mineral is brittle, with Mohs-hardness of 5; Dmeas is 2.62(2) g/cm3 and Dcalc is 2.623?g/cm3. The IR spectrum shows the presence of H2O molecules forming three different H-bonds. Calcinaksite is optically biaxial (+), α--.542(2), β--.550(2), γ--.565(3), 2V meas--5(10). The chemical composition (electron-microprobe data, H2O determined by the Alimarin method, wt%) is: Na2O 6.69, K2O 12.01, CaO 15.04, FeO 0.59, SiO2 61.46, H2O 4.9, total 100.69. The empirical formula is H2.11?K0.99Na0.84Ca1.04Fe0.03Si3.98O11. The crystal structure was solved and refined to R 1--.053, wR 2--.075 based upon 3057 reflections having I-gt;-σ(I). Calcinaksite is triclinic, space group P \( \overline{1} \) , a--.021(2), b--.250(3), c--0.145(2) ?. α--02.23(2)°, β--00.34(2)°, γ--15.09(3)°, V--95.4(3) ?3, Z--. The strongest reflections of the X-ray powder pattern [d, ? (I,%) (hkl)] are: 3.431 (70) (?21, ?11, ?10, 012, 0-2), 3.300 (67) (?31), 3.173 (95) (?03, ?01, ?20, 003, 111), 3.060 (100) (?12, 2-1, ?21, 200, ?-13, 021, ?02), 2.851 (83) (0-3, ?22, 1-3, 1-1), 2.664 (62) (1-3, ?22, 201).