Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery
bannerbannerbannerbannerbannerbanner

IMA 2014-014 = zincomenite

Posted by Marco E. Ciriotti  
avatar
Marco E. Ciriotti January 11, 2017 06:18PM
Reference:
▪ Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Britvin, S.N., Chukanov, N.V., Lykova, I.S., Sidorov, E.G., Pushcharovsky, D.Y. (2016): Zincomenite, ZnSeO3, a new mineral from the Tolbachik volcano, Kamchatka, Russia. European Journal of Mineralogy, 28, 997-1004.

Abstract:
The new mineral zincomenite, β-ZnSeO3, is found in active fumaroles belonging to the Northern fumarole field at the First scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. It is associated with sofiite, sellaite, fluorite, halite, anhydrite, cotunnite, chubarovite, flinteite, etc. Zincomenite occurs as tabular, equant or prismatic crystals up to 0.2 mm sometimes combined in clusters up to 0.3 mm across or interrupted incrustations up to 0.7 × 1 cm overgrowing basalt scoria. Partial to complete pseudomorphs of zincomenite after sofiite are typical. The crystal forms are {101}, {1010}, {1100} and {1013}. T-shaped twins with (012) as twin plane were found. Zincomenite is transparent, colourless, white or pale beige with adamantine lustre. Cleavage and parting were not observed and the fracture is uneven. Dcalc is 4.760 g cm -3. Zincomenite is optically biaxial (–), α = 1.744(5), β = 1.860(5), γ = 1.875(5). The IR spectrum is reported. The chemical composition (wt%, electron microprobe data) is: ZnO 42.53, SeO2 56.67, total 99.20. The empirical formula calculated on the basis of 3 O apfu is: Zn1.02Se0.99O3. Zincomenite is orthorhombic, Pbca, a = 7.1971(2), b = 6.2320(2), c = 11.9914(3) Å, V = 537.84(2) Å3 and Z = 8. The strongest reflections of the powder X-ray diffraction pattern [d,Å(I)(hkl)] are: 4.612(26)(102), 3.601 (77)(200), 3.119(48)(210), 3.048(38)(113), 3.014(100)(211, 021), 2.996(56)(004), 2.771(19)(123, 104, 212), 2.459(23)(213, 023), 2.311(20)(123, 221, 204), and 2.162(19)(214, 024). Zincomenite is a representative of the CuSeO3 structure type. Its crystal structure, solved from single-crystal X-ray diffraction data (R = 0.0188), contains layers formed by Zn2O8 dimers (consisting of edge-sharing ZnO5 trigonal bipyramids; each dimer shares four vertices with the neighbouring ones) linked via (SeO3)2- groups (with Se4+ in trigonal pyramidal coordination) to form an open framework. The mineral is named in allusion to its chemical composition: zinc selenite (the Greek μηναζ means moon, indicating selenium).
Sorry, only registered users may post in this forum.

Click here to login



bannerbannerbannerbannerbannerbanner
Mineral and/or Locality  
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 1993-2017, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: January 24, 2017 05:11:41
Go to top of page