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Voudourisite, Cd(SO4)·H2O, and lazaridisite, Cd3(SO4)3·8H2O, two new minerals from the Lavrion Mining District, Greece

Published online by Cambridge University Press:  09 November 2018

Branko Rieck ,
Christian L. Lengauer  and
Gerald Giester
Branko Rieck
Affiliation:
Institut für Mineralogie und Kristallographie, Universität Wien – Geozentrum, Althanstraße 14, 1090 Wien, Austria
Christian L. Lengauer
Affiliation:
Institut für Mineralogie und Kristallographie, Universität Wien – Geozentrum, Althanstraße 14, 1090 Wien, Austria
Gerald Giester*
Affiliation:
Institut für Mineralogie und Kristallographie, Universität Wien – Geozentrum, Althanstraße 14, 1090 Wien, Austria
*
*Author for correspondence: Gerald Giester, Email: [email protected]
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Abstract

Voudourisite, Cd(SO4)·H2O, and lazaridisite, Cd3(SO4)3·8H2O, are two new minerals from the Esperanza Mine, Kaminiza Area, Lavrion Mining District, Greece. This small ancient mine is also the type locality of niedermayrite and katerinopoulosite. Further associated minerals are sphalerite, galena, edwardsite, chalcanthite, gypsum and greenockite. Both secondary minerals form tiny clusters or crusts and are among the latest to form in this paragenetic sequence. They are colourless or white, transparent to translucent, with a white streak and vitreous lustre. No fluorescence is observed. The minerals exhibit conchoidal fracture, no cleavage or preferred parting. The Mohs hardness is ~3 and both have brittle tenacity. Voudourisite is biaxial (–) with refractive indices at 589(1) nm of α = 1.580(2), β = 1.624(2), γ = 1.640(2), 2Vmeas. = 70(5)°, 2Vcalc. = 61° and β ~ || [010]. Lazaridisite is biaxial neutral with refractive indices at 589(1) nm of α = 1.552(2), β = 1.561(2), γ = 1.570(2), 2Vmeas. = 90(5)° and 2Vcalc. = 90°. The chemical compositions of voudourisite and lazaridisite are close to ideal with only minor amounts of copper detectable. The atomic arrangement in voudourisite (space group P21/c with a = 7.633(2), b = 7.458(2), c = 8.151(2) Å, β = 122.35(1)° and V = 392.0(2) Å3) is related to that of kieserite while lazaridisite (space group C2/c with a = 14.813(3), b = 11.902(2), c = 9.466(2) Å, β = 97.38(1)° and V = 1655.2(6) Å3) is a distinct structure-type. Calculated densities are 3.838 and 3.088 g/cm3, respectively.

The strongest lines in the powder X-ray pattern [d in Å (I) (hkl)] are: 4.890 (66) (110); 3.741 (25) (020); 3.578 (100) (11$\bar 2$); 3.230 (43) (200); 2.525 (33) (022); 2.395 (29) (112) for voudourisite and 6.860 (100) (200); 6.317 (72) (111); 5.965 (84) (020); 4.512 (58) (310); 3.727 (78) (202); 3.608(82)(13$\bar 1$); 3.109 (83) (40$\bar 2$); 3.020 (50) (33$\bar 1$) for lazaridisite, respectively.

Keywords

voudourisitelazaridisitenew mineralcadmium sulfatesLavrion Mining DistrictGreece
Type
Article
Information
Mineralogical Magazine , Volume 83 , Issue 4 , August 2019 , pp. 551 - 559
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Associate Editor: Michael Rumsey

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