minerals Article Patynite, NaKCa4[Si9O23], a New Mineral from the Patynskiy Massif, Southern Siberia, Russia Anatoly V. Kasatkin 1 , Fernando Cámara 2 , Nikita V. Chukanov 3, Radek Škoda 4 , Fabrizio Nestola 5,* , Atali A. Agakhanov 1, Dmitriy I. Belakovskiy 1 and Vladimir S. Lednyov 6 1 Fersman Mineralogical Museum of Russian Academy of Sciences, Leninsky Prospekt 18-2, 119071 Moscow, Russia; [email protected] (A.V.K.); [email protected] (A.A.A.); [email protected] (D.I.B.) 2 Dipartimento di Scienze della Terra “Ardito Desio”, Università degli Studi di Milano, Via Luigi Mangiagalli 34, 20133 Milano, Italy; [email protected] 3 Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, 142432 Moscow Region, Russia; [email protected] 4 Department of Geological Sciences, Faculty of Science, Masaryk University, Kotláˇrská 2, 61137 Brno, Czech Republic; [email protected] 5 Dipartimento di Geoscienze, Università di Padova, Via Gradenigo 6, I-35131 Padova, Italy 6 Khleborobnaya str., 17, 656065 Barnaul, Russia; [email protected] * Correspondence: [email protected]; Tel.: +39-049-827-9160 Received: 13 September 2019; Accepted: 2 October 2019; Published: 5 October 2019 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 2 spectra shows the absence in the mineral of H2O, OH−, and CO3 − 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 P1. The unit-cell parameters are: a = 7.27430(10), b = 10.5516(2), c = 13.9851(3) 3 Å, α = 104.203(2)◦, β = 104.302(2)◦, γ = 92.0280(10)◦, V = 1003.07(3) Å , Z = 2. The crystal structure was solved by direct methods and refined to R1 = 0.032. Patynite is an inosilicate with a new type 10 20 of sextuple branched tubular chain [(Si9O23) −] with an internal channel and [(Si18O46) −] as the 1 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. Keywords: patynite; new mineral; Patynskiy massif; chemistry; new structure type; tubular silicate radical 1. Introduction Inosilicates represent a very large group of minerals with chain structures. Amongst them, only five mineral species, namely, calcinaksite KNaCa(Si O ) H O[1], canasite 4 10 · 2 K Na Ca Si O (OH) [2,3], fluorcanasite K Na Ca Si O F H O[4], its dimorph frankamenite 3 3 5 12 30 4 3 3 5 12 30 4· 2 Minerals 2019, 9, 611; doi:10.3390/min9100611 www.mdpi.com/journal/minerals Minerals 2017, 7, x FOR PEER REVIEW 2 of 18 Minerals 2019, 9, 611 2 of 19 fluorcanasite K3Na3Ca5Si12O30F4·H 2O [4], its dimorph frankamenite K3Na3Ca5Si12O30(F,OH)4·H 2O [5,6], and tinaksite K2NaCa2TiSi7O18(OH)O [7–9] are characterized by a very rare feature: the ordering of K Na Ca Si O (F,OH) H O [5,6], and tinaksite K NaCa TiSi O (OH)O [7–9] are characterized by Na,3 K3, and5 Ca12 in30 their structures.4· 2 2 2 7 18 a veryIn rarethe feature:course theof the ordering routine of Na,SEM/EDS K, and Castudy in their of the structures. materials sent to the first author for identificationIn the course by ofmineral the routine collectors SEM/ EDSfrom study Southern of the Siberia, materials we sent encountered to the first author an unknown for identification mineral bycontaining mineral only collectors Na, K, from Ca, SouthernSi, and O Siberia,and hav weing encountered a very unusual an unknownNa:K:Ca:Si mineral stoichiometr containingy equal only to Na,the 1:1:4:9 K, Ca, ratio Si, and. Its O further and having investigation a very unusual resulted Na:K:Ca:Si in a discovery stoichiometry of a sixth equalinosilicate to the mineral 1:1:4:9 ratio.with Itsordered further Na, investigation K, and Ca, resultedhowever, in it a is discovery completely of adifferent sixth inosilicate from all mineralfive materials with ordered mentioned Na, K,above and Ca,by the however, total absence it is completely of H2O, OH diff, erentand F, from and allby fivea substantially materials mentioned different structure. above by This the total new absencespecies ofwas H 2namedO, OH, patynite and F, and (pronounced by a substantially pa ty dinaitfferent; патынит structure. in cyrilic This new) after species the wasPatynskiy named m patyniteassif in (pronouncedsouthern Siberia pa tywhere nait; itпa hasтынит beenin found. cyrilic) after the Patynskiy massif in southern Siberia where it has beenT found.he mineral and its name have been approved by the IMA Commission on New Minerals, NomenclatureThe mineral and and Classification its name have(IMA been no. 201 approved9-018). Type by the material IMA Commissionis deposited in on the New collections Minerals, of Nomenclaturethe Fersman Mineralogical and Classification Museum (IMA of no.the 2019-018).Russian Academy Type material of Sciences, is deposited Moscow, in theRussia collections, with the of theregistration Fersman number Mineralogical 5369/1. Museum of the Russian Academy of Sciences, Moscow, Russia, with the registration number 5369/1. 2. Occurrence, Geological Settings, and Mineral Association 2. Occurrence, Geological Settings, and Mineral Association Samples containing the new mineral were found in August 2018 during a field trip made by a groupSamples of amateur containing mineralogists the new from mineral Altay were Krai found lead in by August one of 2018 the duringauthors a field(V.S.L.) trip to made Gornaya by a groupShoriya, of amateura mountainous mineralogists-taiga region from Altay located Krai in lead the by South one of of the Kemerovo authors (V.S.L.) (Kemerovskaya) to Gornaya Shoriya,Oblast’, aSouthern mountainous-taiga Siberia, Russia. region More located precisely, in the the South new ofmineral Kemerovo was collected (Kemerovskaya) in the massif Oblast’, of Patyn Southern Mt. Siberia,(aka Patynskiy Russia. massif) More precisely, located thein the new central mineral part was of collectedGornaya inShoriya, the massif in the of PatynTashtagolskiy Mt. (aka District Patynskiy of massif)Kemerovo located Oblast’ in the (Figure central 1) part. Geographical of Gornaya coordinates Shoriya, in the of Tashtagolskiythe locality are District 53°3’32 of”Kemerovo N and 88°44 Oblast’’29” (FigureE. 1). Geographical coordinates of the locality are 53 ◦3032” N and 88◦44029” E. Figure 1. Patynskiy massif: general view from Mt. Patyn Patyn.. August August,, 2018. Photo: Photo: Vladimir Vladimir S. S. Lednyov. Lednyov. Geologically, PatynskiyPatynskiy massif massif belongs belongs to an to Early an DevonianEarly Devonian gabbro-syenite gabbro- formation.syenite formation. It occupies It anoccupies approximate an approximate area of 50 area km2 andof 50 has km an2 and isometric has an outline. isometric Its contactsoutline. fallIts co fromntacts the fall periphery from the to theperiphery central to part the showing central part a funnel showing form a offunnel the massif. form of Patynskiy the massif. massif Patynskiy was formed massif inwas near-surface formed in conditionsnear-surface and, conditions most probably, and, most represents probably, represents a subvolcano. a subvolcano. It is composed It is composed mainly mainly of basic of rocksbasic includingrocks including different different types of types gabbro of (olivinegabbro and(olivine titanomagnetite and titanomagnetite ones with ones coarse with grained coarse pegmatoid, grained vesicular,pegmatoid, and vesicular porphyritic, and textures), porphyritic as welltextures), as troctolites, as well norites, as troctolites, pyroxenites, norites, anorthosites, pyroxenites, etc. Otheranorthosites types,of etc. rocks Other are types represented of rocks by are rare represented dikes of microgranites, by rare dikes selvsbergites, of microgranites, grorudites, selvsbergites, veins of monticellite–melilite–nephelinegrorudites, veins of monticellite rocks,–melilite acid–nepheline and alkaline rocks, pegmatites, acid and andalkaline alkaline pegmatites, syenites. and While alkaline basic Minerals 2019, 9, 611 3 of 19 Minerals 2017, 7, x FOR PEER REVIEW 3 of 18 rockssyenites. are While strongly basic dominant rocks are throughout strongly dominant the massif throughout and show athe concentric-zonal massif and show structure, a concentric other-zonal ones arestructure, spread other out locally ones are in centralspread andout locally south-western in central parts and ofsouth the- massif.western All parts these of the rocks massif. are studied All these in detailrocks are and studied described in detail in the and geologic described literature in the [10 geologic–13]. literature [10–13]. The north-easternnorth-eastern part part of Patynskiyof Patynskiy massif massif has beenhas rarelybeen studied;rarely studied it was considered; it was considered by geologists by asgeologists unpromising as unpromising for industrial for mineralization.industrial mineralization.