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Kayupovaite, Na2Mn10[(Si14Al2)O38(OH)8]⋅7H2O – a new stilpnomelane-related mineral from the Ushkatyn-III deposit, Kazakhstan

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Publicado en:European Journal of Mineralogy vol. 37, no. 6 (2025), p. 829-841
Autor principal: Vereshchagin, Oleg S.
Otros Autores: Britvin, Sergey N., Brusnitsyn, Aleksey I., Shagova, Anastasiia K., Perova, Elena N., Pekov, Igor V., Shilovskikh, Vladimir V., Vlasenko, Natalia S., Avdontseva, Evgeniya Y., Platonova, Natalia V., Bocharov, Vladimir N.
Publicado:
Copernicus GmbH
Materias:
Kazakhstan
Manganese ores
X ray powder diffraction
Infrared radiation
Minerals
Lattice vibration
Calcite
Iron
Manganese
Fractionation
Sediments
Mineralogy
Barite
Radiation
Stretching
Absorption spectra
Crystals
Quartz
Bending
Data collection
Silica
Optical properties
Diffraction patterns
Mineralization
X-ray diffraction
Environmental
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Resumen:Kayupovaite, with the idealized formula Na2Mn10[(Si14Al<inline-formula><mml:math display="inline" id="M12"><mml:mrow><mml:msub><mml:mi></mml:mi><mml:mn mathvariant="normal">2</mml:mn></mml:msub><mml:mo>)</mml:mo></mml:mrow></mml:math></inline-formula>O38(OH)8]<inline-formula><mml:math display="inline" id="M15"><mml:mo>⋅</mml:mo></mml:math></inline-formula>7H2O, is a new mineral named in honor of Maria Mikhailovna Kayupova (1921–1980), the mineralogist of the Satpaev Institute of Geological Sciences (Alma-Ata, USSR) who studied the Ushkatyn-III complex baryte–lead/iron–manganese deposit, Karagandy Province, Kazakhstan, the type of locality of the described mineral. Kayupovaite forms coarse lamellar (typically bent and split), light-gray, greasy luster crystals up to <inline-formula><mml:math display="inline" id="M17"><mml:mrow><mml:mn mathvariant="normal">0.2</mml:mn><mml:mo>×</mml:mo><mml:mn mathvariant="normal">0.15</mml:mn><mml:mo>×</mml:mo><mml:mn mathvariant="normal">0.01</mml:mn></mml:mrow></mml:math></inline-formula> mm in size, combined into radial, scaly, or lamellar aggregates up to <inline-formula><mml:math display="inline" id="M18"><mml:mrow><mml:mn mathvariant="normal">3</mml:mn><mml:mo>×</mml:mo><mml:mn mathvariant="normal">3</mml:mn><mml:mo>×</mml:mo><mml:mn mathvariant="normal">0.5</mml:mn></mml:mrow></mml:math></inline-formula> cm and embedded in a calcite–rhodonite matrix. Optically, in transmitted light, kayupovaite is colorless, with undulatory extinction due to the crystal curvature. It is non-pleochroic and biaxial (–), with <inline-formula><mml:math display="inline" id="M19"><mml:mi mathvariant="italic">α</mml:mi></mml:math></inline-formula> of 1.551(4) and <inline-formula><mml:math display="inline" id="M20"><mml:mrow><mml:mi mathvariant="italic">β</mml:mi><mml:mo>=</mml:mo><mml:mi mathvariant="italic">γ</mml:mi><mml:mn mathvariant="normal">1.586</mml:mn><mml:mo>(</mml:mo><mml:mn mathvariant="normal">2</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math></inline-formula>, 2<inline-formula><mml:math display="inline" id="M21"><mml:mrow><mml:msub><mml:mi>V</mml:mi><mml:mi mathvariant="normal">meas</mml:mi></mml:msub><mml:mo>=</mml:mo><mml:mn mathvariant="normal">3</mml:mn><mml:mo>±</mml:mo><mml:mn mathvariant="normal">1</mml:mn></mml:mrow></mml:math></inline-formula>°. Kayupovaite is monoclinic and of space group <inline-formula><mml:math display="inline" id="M22"><mml:mi>C</mml:mi></mml:math></inline-formula>2/<inline-formula><mml:math display="inline" id="M23"><mml:mi>c</mml:mi></mml:math></inline-formula>, with <inline-formula><mml:math display="inline" id="M24"><mml:mrow><mml:mi>a</mml:mi><mml:mo>=</mml:mo><mml:mn mathvariant="normal">24.9149</mml:mn><mml:mo>(</mml:mo><mml:mn mathvariant="normal">9</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math></inline-formula>, <inline-formula><mml:math display="inline" id="M25"><mml:mrow><mml:mi>b</mml:mi><mml:mo>=</mml:mo><mml:mn mathvariant="normal">16.4343</mml:mn><mml:mo>(</mml:mo><mml:mn mathvariant="normal">5</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math></inline-formula>, <inline-formula><mml:math display="inline" id="M26"><mml:mrow><mml:mi>c</mml:mi><mml:mo>=</mml:mo><mml:mn mathvariant="normal">22.3974</mml:mn><mml:mo>(</mml:mo><mml:mn mathvariant="normal">7</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math></inline-formula> Å, <inline-formula><mml:math display="inline" id="M27"><mml:mrow><mml:mi mathvariant="italic">β</mml:mi><mml:mo>=</mml:mo><mml:mn mathvariant="normal">94.408</mml:mn><mml:mo>(</mml:mo><mml:mn mathvariant="normal">3</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math></inline-formula>°, <inline-formula><mml:math display="inline" id="M28"><mml:mrow><mml:mi>V</mml:mi><mml:mo>=</mml:mo><mml:mn mathvariant="normal">9143.7</mml:mn><mml:mo>(</mml:mo><mml:mn mathvariant="normal">5</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math></inline-formula> Å3, and <inline-formula><mml:math display="inline" id="M30"><mml:mrow><mml:mi>Z</mml:mi><mml:mo>=</mml:mo><mml:mn mathvariant="normal">8</mml:mn></mml:mrow></mml:math></inline-formula>. The strongest lines of the powder X-ray diffraction pattern (<inline-formula><mml:math display="inline" id="M31"><mml:mi>d</mml:mi></mml:math></inline-formula> in Å (<inline-formula><mml:math display="inline" id="M32"><mml:mi>I</mml:mi></mml:math></inline-formula>) (hkl)) are as follows: 12.34(100)(200), 3.45(8)(<inline-formula><mml:math display="inline" id="M33"><mml:mrow><mml:mn mathvariant="normal">71</mml:mn><mml:mo>-</mml:mo><mml:mn mathvariant="normal">1</mml:mn></mml:mrow></mml:math></inline-formula>), 3.09(8)(800), 2.85(100)(121), 2.5946(12)(714), 2.642(11)(354), 2.614(7)(<inline-formula><mml:math display="inline" id="M34"><mml:mrow><mml:mn mathvariant="normal">40</mml:mn><mml:mo>-</mml:mo><mml:mn mathvariant="normal">8</mml:mn></mml:mrow></mml:math></inline-formula>), and 2.414(7)(554). The Raman spectrum of kayupovaite contains the following bands (cm−1): 3635 and 3560 (O–H stretching vibrations of OH groups and H2O molecules); 1041, 768, 742, and 717 (Si–O and Al–O stretching modes); 657, 532, 499, 460, 405, 374, and 333 (Mn–O stretching and Si–O–Si modes); and 304, 291, 224, 157, and 100 (lattice modes). The absorption bands of the infrared spectrum are as follows (cm−1): 3629, 3511, and 3390 (O–H stretching vibrations of OH groups and H2O molecules); 1640 (H2O bending vibrations); 1020 (Si–O stretching vibrations); 778 (IVAl–O stretching vibrations); 724 (Mn–O–H bending mode); 651 (O–Si–O bending mode); and 459 (Mn2+–O stretching vibrations). The empirical formula of kayupovaite, calculated on the basis of (O <inline-formula><mml:math display="inline" id="M42"><mml:mo>+</mml:mo></mml:math></inline-formula> OH) <inline-formula><mml:math display="inline" id="M43"><mml:mo>=</mml:mo></mml:math></inline-formula> 46 atoms per formula unit, is (Na0.91K0.46Ca0.14)Σ1.51(Mn<inline-formula><mml:math display="inline" id="M48"><mml:mrow><mml:msubsup><mml:mi></mml:mi><mml:mn mathvariant="normal">9.29</mml:mn><mml:mrow><mml:mn mathvariant="normal">2</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msubsup></mml:mrow></mml:math></inline-formula>Mg0.89Zn0.02)Σ10.20[(Si14.28Al1.61)Σ15.89O38(OH)8]<inline-formula><mml:math display="inline" id="M57"><mml:mo>⋅</mml:mo></mml:math></inline-formula>7.23H2O. The mineral belongs to the group of modulated manganese phyllosilicates and is structurally related to stilpnomelane. The absence of iron in the mineral is a result of oxidative Mn–Fe fractionation during the formation of braunite-rich Mn ores.
ISSN:0935-1221
1617-4011
DOI:10.5194/ejm-37-829-2025
Fuente:Publicly Available Content Database