Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsThe Rock H. Currier Digital LibraryGeologic Time
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsClubs & OrganizationsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral Quiz
Photo SearchPhoto GalleriesSearch by ColorNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography
╳Discussions
💬 Home🔎 Search📅 LatestGroups
EducationOpen discussion area.Fakes & FraudsOpen discussion area.Field CollectingOpen discussion area.FossilsOpen discussion area.Gems and GemologyOpen discussion area.GeneralOpen discussion area.How to ContributeOpen discussion area.Identity HelpOpen discussion area.Improving Mindat.orgOpen discussion area.LocalitiesOpen discussion area.Lost and Stolen SpecimensOpen discussion area.MarketplaceOpen discussion area.MeteoritesOpen discussion area.Mindat ProductsOpen discussion area.Mineral ExchangesOpen discussion area.Mineral PhotographyOpen discussion area.Mineral ShowsOpen discussion area.Mineralogical ClassificationOpen discussion area.Mineralogy CourseOpen discussion area.MineralsOpen discussion area.Minerals and MuseumsOpen discussion area.PhotosOpen discussion area.Techniques for CollectorsOpen discussion area.The Rock H. Currier Digital LibraryOpen discussion area.UV MineralsOpen discussion area.Recent Images in Discussions
Mineralogical ClassificationIMA 2013-071 = zvyaginite
7th Jul 2014 10:33 UTCMarco E. Ciriotti Manager
▪ Pekov, I.V., Lykova, I.S., Chukanov, N.V., Yapaskurt, V.O., Belakovskiy, D.I., Zolotarev, A.A., Jr., Zubkova, N.V. (2014): Zvyaginite NaZnNb2Ti2O(OH,F)3(H2O) 4+x(х<1) a new mineral of epistolite group from Lovozero alkaline massif (Kola Peninsula, Russia). Zapiski RMO, 143, 45-63.
Abstract:
A new mineral zvyaginite, epistolite-group member, is found at Mt. Malyi Punkaruaiv, Lovozero alkaline complex, Kola Peninsula, Russia. It occurs in a hydrothermally altered peralkaline pegmatite and is associated with ussingite, microcline, aegirine, sphalerite, vigrishinite, sauconite, etc. Zvyaginite forms rectangular or irregularly shaped lamellae up to 0.1X1 x2 cm flattened on <001>. The mineral is translucent to transparent and colourless, pearly-white, yellowish-brownish, pale pink or lilac- pink. The lustre is nacreous on crystal faces and greasy on broken surface. Mohs' hardness is 21/2—3. Zvyaginite is brittle. Cleavage is {001} perfect. Dmeas = 2.88(3), Dcalc = 2.94 g/cm3. The mineral is optically biaxial (-), alpha = 1.626(5), beta - 1.714(3), gamma = 1.740(5), 2Vmeas - 45(15)°, 2Vcalc = 55°. IR spectrum is given. Chemical composition (wt %; averaged data of 5 electron-microprobe analyses, H20 — by modified Penfield method) is: Na2O 4.74, K2O 0.22, CaO 0.77, MnO 1.36, FeO 0.24, ZnO 9.61, Al2O3 0.19, SiO2 29.42, TiO2 12.33, Nb2O5 27.22, F 1.94, H2O 12.65, -O = F2 -0.82, total 99.87.
The empirical formula calculated on the basis of Si+Al = 4 is: Na1.24K0.04Ca0.11Mn0.16Fe0.03Zn0.96Nb1.66Ti125(Si3.97Al0.03)tot4O15.07(OH)2.10F0.83(H20)4.64. The simplified formula is: NaZnNb2Ti20(OH,F)3(H20)4 + ^ (x < 1). Zvyaginite is triclinic, P-1, a = 8.975(3), b = 8.979(3), c = 12.135(4) A, alpha = 74.328(9)°, beta = 80.651(8)°, gamma 73.959(8)°, V = 900.8(6) A3, Z = 2. The strongest reflections of the X-ray powder pattern (,А-/<Щ) are: 11.72-100<001>; 5.83-40<002>; 5.28-53<-l-ll, 112>; 4.289-86<200, 021>; 3.896-36<-l-12, -201, 003, 022, 113>, 2.916-57<310, 132, 004>, 2.862-72<130, 312>. The crystal structure model was obtained on a single crystal, R = 0.159. Zvyaginite and epistolite are close in the structure of the NbTiSiO motif but different from one another in composition of the О layer in the HOH block. Zvyaginite is named in honor of Russian crystallographer, crystal chemist and physicist Boris B. Zvyagin (1921-2002). The type specimen is deposited in the Fersman Mineralogical Museum of Russian Academy of Sciences, Moscow.
26th Jul 2014 09:06 UTCKnut Edvard Larsen 🌟 Manager
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 19, 2024 00:50:13
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 19, 2024 00:50:13