Publication details
Patynite, NaKCa4[Si9O23], a New Mineral from the Patynskiy Massif, Southern Siberia, Russia
| Authors | |
|---|---|
| Year of publication | 2019 |
| Type | Article in Periodical |
| Magazine / Source | International Mining and Minerals |
| MU Faculty or unit | |
| Citation | |
| Web | https://www.mdpi.com/2075-163X/9/10/611 |
| Doi | http://dx.doi.org/10.3390/min9100611 |
| Keywords | patynite; new mineral; Patynskiy massif; chemistry; new structure type; tubular silicate radical |
| Description | 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 x 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/cm(3); density calculated from the empirical formula is 2.793 g/cm(3). The Mohs' hardness is 6. Optically, patynite is biaxial (-) with alpha = 1.568(2), beta = 1.580(2), and gamma = 1.582(2) (589 nm). The 2V (measured) = 40(10)degrees and 2V (calculated) = 44.1 degrees. 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) over bar. The unit-cell parameters are: a = 7.27430(10), b = 10.5516(2), c = 13.9851(3) angstrom, alpha = 104.203(2)degrees, beta = 104.302(2)degrees, gamma = 92.0280(10)degrees, V = 1003.07(3) angstrom(3), Z = 2. The crystal structure was solved by direct methods and refined to R-1 = 0.032. Patynite is an inosilicate with a new type of sextuple branched tubular chain [(Si9O23)(10-)](infinity) with an internal channel and [(Si18O46)(20-)] as the repeat unit. The strongest lines of the powder X-ray diffraction pattern [d(obs), angstrom (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. |