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@article{1861656,
author = {Kampf, Anthony R. and Plášil, Jakub and Škoda, Radek and Čejka, Jiří},
article_number = {1},
doi = {http://dx.doi.org/10.3190/jgeosci.341},
keywords = {michalskiite; new mineral; lyonsite; crystal structure; Raman spectroscopy},
language = {eng},
issn = {1802-6222},
journal = {Journal of Geosciences},
title = {Michalskiite, Cu2+Mg3Fe3.333+(VO4)(6), an Mg analogue of lyonsite, from the Ronneburg uranium deposit, Thuringia, Germany},
url = {http://www.jgeosci.org/detail/jgeosci.341/abstract},
volume = {67},
year = {2022}
}
TY - JOUR
ID - 1861656
AU - Kampf, Anthony R. - Plášil, Jakub - Škoda, Radek - Čejka, Jiří
PY - 2022
TI - Michalskiite, Cu2+Mg3Fe3.333+(VO4)(6), an Mg analogue of lyonsite, from the Ronneburg uranium deposit, Thuringia, Germany
JF - Journal of Geosciences
VL - 67
IS - 1
SP - 33-40
EP - 33-40
PB - Česká geologická společnost
SN - 18026222
KW - michalskiite
KW - new mineral
KW - lyonsite
KW - crystal structure
KW - Raman spectroscopy
UR - http://www.jgeosci.org/detail/jgeosci.341/abstract
N2 - Michalskiite (IMA2019-162), Cu2+Mg3Fe3+3.33(VO4)6, is a new mineral found on specimens from the dump of the Lichtenberg open pit, Ronneburg uranium mining district, Thuringia, Germany. It is a secondary mineral occurring with arcanite, epsomite, hematite and syngenite on matrix consisting of fine-grained quartz, K-feldspar and mica. It forms striated prisms and needles, elongated on [001], up to about 0.2 mm long. Crystals are brown-red with a light orange streak. They are transparent and have adamantine lustre. The mineral is brittle with curved fracture, very good {001} cleavage and a Mohs hardness of ~3½. The calculated density is 3.848 g.cm-3 based on the empirical formula. The new mineral is biaxial (-), with 2Vmeas = 49(1)°. No pleochroism was observed. Optical orientation is X = c. The empirical formula of michalskiite (on the basis of 24 O apfu) is (Cu2+1.31Mg2.76Fe3+2.75Al0.21Ni0.16Ti4+0.14Mn3+0.06Zn0.01)Σ7.40(V5+5.96Si0.02)Σ5.98O24. The Raman spectrum is dominated by the vibrations of VO43- units. Michalskiite is orthorhombic, Pmcn, a = 10.2356(9), b = 17. 3689(16), c = 4.9406(4) Å, V = 878.35(13) Å3 and Z = 2. The five strongest powder X-ray diffraction lines are [dobs, Å (I, %) (hkl) ]: 3.27 (100) (221,150), 2.74 (40) (241,151), 2.52 (50) (331), 1.55 (30) (282), 1.42 (25) (063). The crystal structure of michalskiite was refined from the single-crystal X-ray data to R = 0.0386 for 888 independent observed reflections, with Iobs > 2σ(I). Michalskiite is isostructural with lyonsite; however, the Cu2 site in the lyonsite structure is split into M2 and M2’ sites in the michalskiite structure with Mg occupying the M2’ site. The new mineral name honours German mineral collector and dealer Dipl. Min. Steffen Michalski, who discovered this mineral.
ER -
KAMPF, Anthony R., Jakub PLÁŠIL, Radek ŠKODA a Jiří ČEJKA. Michalskiite, Cu2+Mg3Fe3.333+(VO4)(6), an Mg analogue of lyonsite, from the Ronneburg uranium deposit, Thuringia, Germany. \textit{Journal of Geosciences}. Česká geologická společnost, 2022, roč.~67, č.~1, s.~33-40. ISSN~1802-6222. Dostupné z: https://dx.doi.org/10.3190/jgeosci.341.
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