Detailed Information on Publication Record
2017
Plavnoite, a new K-Mn member of the zippeite group from Jachymov, Czech Republic
PLÁŠIL, Jakub, Pavel ŠKACHA, Jiří SEJKORA, Antony KAMPF, Radek ŠKODA et. al.Basic information
Original name
Plavnoite, a new K-Mn member of the zippeite group from Jachymov, Czech Republic
Authors
PLÁŠIL, Jakub (203 Czech Republic), Pavel ŠKACHA (203 Czech Republic), Jiří SEJKORA (203 Czech Republic), Antony KAMPF (840 United States of America), Radek ŠKODA (203 Czech Republic, guarantor, belonging to the institution), Jiří ČEJKA (203 Czech Republic), Jan HLOUŠEK (203 Czech Republic), Anatoly KASATKIN (643 Russian Federation), Radim PAVLÍČEK (203 Czech Republic) and Karel BABKA (203 Czech Republic)
Edition
European Journal of Mineralogy, STUTTGART, E SCHWEIZERBARTSCHE VERLAGSBUCHHANDLUNG, SCIENCE PUBLISHERS, 2017, 0935-1221
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10504 Mineralogy
Country of publisher
Germany
Confidentiality degree
není předmětem státního či obchodního tajemství
Impact factor
Impact factor: 1.190
RIV identification code
RIV/00216224:14310/17:00100327
Organization unit
Faculty of Science
UT WoS
000396823700010
Keywords in English
plavnoite; uranyl sulfate hydrate; new mineral; zippeite group; crystal structure; chemical composition
Tags
International impact, Reviewed
Změněno: 10/4/2018 16:52, Ing. Nicole Zrilić
Abstract
V originále
The new mineral plavnoite (IMA2015-059), ideally K0.8Mn0.6[(UO2)(2)O-2(SO4)]center dot 3.5H(2)O, is a member of the zippeite group. It was found in the Plavno mine, in the eastern part of the Jachymov ore district, Western Bohemia, Czech Republic, where it occurs as a supergene alteration phase formed by hydration-oxidation weathering of uraninite in hydrothermal U-veins. It was found to be associated with marecottite, magnesiozippeite, blatonite and gypsum. The mineral occurs as reddish to reddish-orange thin blades, elongated on [0 0 1] and flattened on {0 1 0}, which are intergrown in globular aggregates up to 0.5 mm across. Crystals are transparent with a vitreous to silky lustre. The streak is pale orange. The mineral is non-fluorescent under both long- and short-wave ultraviolet (UV) radiation. The Mohs hardness is about 2. Crystals are brittle with perfect {0 1 0} cleavage and uneven fracture. The density calculated from the empirical formula is 4.926 g cm(-3). Optically, plavnoite is biaxial (+), with alpha = 1.740(5), beta = 1.770(5), gamma = 1.850(5) (measured in white light). The measured 2V is 64.6(4)degrees; the calculated 2V is 65.3 degrees. Dispersion could not be observed; no pleochroism was observed. Electron-microprobe analyses yielded the empirical formula (based on 2 U atoms per formula unit,apfu) K-0.77(Mn0.51Zn0.04Ni0.03Mg0.02)(Sigma 0.60)[(UO2)(2)O-1.08(OH)(0.92)(SO4)(0.96)(SiO4)(0.24)](H2O)(3.50). Plavnoite is monoclinic, C2/c, a = 8.6254 (16), b = 14.258(3), c = 17.703(4) angstrom, beta = 104.052(18)degrees, V = 2122.0(8) angstrom(3) and Z = 8. The structure (R-1 = 4.99% for 989 reflections with 1 > 3 sigma[I]) contains UO7 pentagonal bipyramids and SO4 tetrahedra forming sheets of the well-known zippeite topology. The interlayer region contains infinite zig-zag chains of corner-sharing Mn2+phi(6) octahedra (phi=O, H2O) with K-centred polyhedra. The K atom sits at the partially occupied, mixed K/O site, the non-shared corner of the Mn2 octahedron. The mineral is named after the type locality - the Plavno mine.
Links
| MUNI/A/1316/2015, interní kód MU |
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