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Millsite, CuTeO3·2H2O: a new polymorph of teineite from Gråurdfjellet, Oppdal, Norway

Published online by Cambridge University Press:  28 February 2018

Michael S. Rumsey ,
Mark D. Welch ,
Frode Mo ,
Annette K. Kleppe ,
John Spratt ,
Anthony R. Kampf  and
Morten P. Raanes
Michael S. Rumsey
Affiliation:
Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK.
Mark D. Welch*
Affiliation:
Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK.
Frode Mo
Affiliation:
Dept. of Physics, Norwegian University of Science and Technology, NTNU – Trondheim, NO-7491, Trondheim, Norway.
Annette K. Kleppe
Affiliation:
Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, UK
John Spratt
Affiliation:
Core Research Laboratories, Natural History Museum, Cromwell Road, London SW7 5BD, UK
Anthony R. Kampf
Affiliation:
Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA
Morten P. Raanes
Affiliation:
Department of Materials Science and Engineering, Norwegian University of Science and Technology, NTNU – Trondheim, NO-7491, Trondheim, Norway
*
*E-Mail: mdw@nhm.ac.uk
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Abstract

Millsite, CuTeO3·2H2O, is a new mineral from Gråurdfjellet in Oppdal, Norway. It occurs as a minor secondary phase alongside teineite, other copper secondaries and relict primary tellurides in a boulder of quartz-rich granite, which is probably a glacial erratic. Millsite is bright cyan to royal blue in colour. The mineral is transparent to slightly translucent with a vitreous lustre and has a perfect (100) cleavage. It is brittle, has a conchoidal fracture and a pale green streak. Millsite is optically biaxial (+), α = 1.756(5), β = 1.794(5), γ = 1.925calc and 2Vmeas = 60(1)°. Millsite has monoclinic space group P21/c, with a = 7.4049(2) Å, b = 7.7873(2) Å, c = 8.5217(2) Å, β = 110.203(3)°, V = 461.17(2) Å3 and Z = 4. The empirical formula is Cu0.99(Te0.98Se0.02)O3(H2O)2. The five strongest reflections in the powder X-ray diffraction pattern are [dhkl in Å (hkl, Irel%)]: 6.954 (100, 100), 3.558 (012, 64), 2.838 (12$\bar 2$, 47), 2.675 (211, 43) and 3.175 (210, 39). The crystal structure has been determined to R1 = 0.016, wR2 = 0.036 and GooF = 1.049. The diagnostic structural unit of millsite consists of a Cu2O6(H2O)4 dimer that is decorated with four TeO3 groups connecting adjacent dimers and defining (100) heteropolyhedral sheets. These heteropolyhedral sheets are only connected by layers of structurally significant hydrogen bonds and correlate with the (100) cleavage. Millsite is a polymorph of teineite with a unique configuration of the M2O6(H2O)4 dimer that leads to a sheet topology. No isostructural selenium or tellurium analogue exists. The monoclinic polymorph (P21/c) of chalcomenite ‘monoclinic-CuSeO3·2H2O’ hereafter, ahlfeldite and MgSeO3·2H2O have M2O6(H2O)4 dimers, but their configuration differs significantly from that of millsite and leads to a framework topology rather than a sheet. Teineite does not have a dimeric structure and so is fundamentally different from millsite. The sheet topology of millsite appears to be unique among tellurites.

Keywords

millsitenew mineralcopper tellurite dihydrateteineitetype mineralNorway
Type
Article
Information
Mineralogical Magazine , Volume 82 , Issue 2 , April 2018 , pp. 433 - 444
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Associate Editor: Stuart Mills

References

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