Abstract
The new mineral patynite was discovered at the massif of Patyn Mt. (Patynskiy massif), Tashtagolskiy District, Kemerovo (Kemerovskaya) Oblast’, Southern Siberia, Russia. Patynite forms lamellae up to 1 0.5 cm and is closely intergrown with charoite, tokkoite, diopside, and graphite. Other associated minerals include monticellite, wollastonite, pectolite, calcite, and orthoclase. Patynite is colorless in individual lamellae to white and white-brownish in aggregates. It has vitreous to silky luster, white streaks, brittle tenacity, and stepped fractures. Its density measured by flotation in Clerici solution is 2.70(2) g/cm3; density calculated from the empirical formula is 2.793 g/cm3. The Mohs’ hardness is 6. Optically, patynite is biaxial (–) with α = 1.568(2), β = 1.580(2), and γ = 1.582(2) (589 nm). The 2V (measured) = 40(10) and 2V (calculated) = 44.1. The Raman and IR spectra shows the absence in the mineral of H2O, OH–, and CO32– groups and B–O bonds. The chemical composition is (electron microprobe, wt.%): Na2O 3.68, K2O 5.62, CaO 26.82, SiO2 64.27, total 100.39. The empirical formula based on 23 O apfu is Na1.00K1.00Ca4.02Si8.99O23. Patynite is triclinic, space group P–1. The unit-cell parameters are: a = 7.27430(10), b = 10.5516(2), c = 13.9851(3) Å, α = 104.203(2)°, β = 104.302(2)°, γ = 92.0280(10)°, V = 1003.07(3) Å3, Z = 2. The crystal structure was solved by direct methods and refined to R1 = 0.032. Patynite is an inosilicate with a new type of sextuple branched tubular chain [(Si9O23)10–] with an internal channel and [(Si18O46)20–] as the repeat unit. The strongest lines of the powder X-ray diffraction pattern [dobs, Å (I, %) (hkl)] are: 3.454 (100) (2-1-1), 3.262 (66) (2-1-2), 3.103 (64) (02-4), 2.801 (21), 1.820 (28) (40-2). Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia with the registration number 5369/1.
Highlights
Inosilicates represent a very large group of minerals with chain structures
The new mineral itself is not fluorescent, macro specimens containing patynite show bright green fluorescence under SW UV radiation, presumably due to absorbed, very thin films of unidentified, amorphous uranyl-bearing Al-Si minerals filling the microcracks at the contacts of patynite with the associated minerals
Its density measured by flotation in Clerici solution is 2.70(2) g/cm3 ; density calculated from the empirical formula is 2.793 g/cm3
Summary
Inosilicates represent a very large group of minerals with chain structures. Amongst them, only five mineral species, namely, calcinaksite KNaCa(Si4 O10 )·H2 O [1], canasite. Minerals 2019, 9, 611 fluorcanasite K3Na3Ca5Si12O30F4·H2O [4], its dimorph frankamenite K3Na3Ca5Si12O30(F,OH)4·H2O [5,6], and tinaksite K2NaCa2TiSi7O18(OH)O [7,8,9] are characterized by a very rare feature: the ordering of. It is completely different from all five materials mentioned above by the total absence by the total absence of H2O, OH, and F, and by a substantially different structure O, OH, patynite and F, and by a substantially structure This new species namedmassif patynite was (pronounced pa ty different nait; патынит in cyrilic) after the was Patynskiy in (pronounced pa ty nait; пaтынитin cyrilic) after the Patynskiy massif in southern.
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