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Zincostottite, ZnGe(OH)6, the zinc analogue of stottite from Tsumeb, Namibia

Published online by Cambridge University Press:  11 November 2024

Anthony R. Kampf Open the ORCID record for Anthony R. Kampf [Opens in a new window] ,
Joy Désor ,
Mark D. Welch ,
Chi Ma Open the ORCID record for Chi Ma [Opens in a new window]  and
Gerhard Möhn
Anthony R. Kampf*
Affiliation:
Mineral Sciences Department, Natural History Museum of Los Angeles County, Los Angeles, CA, USA
Joy Désor
Affiliation:
Independent Researcher, Bad Homburg, Germany
Mark D. Welch
Affiliation:
Natural History Museum, London, UK
Chi Ma
Affiliation:
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA;
Gerhard Möhn
Affiliation:
Independent Researcher, Niedernhausen, Germany
*
Corresponding author: Anthony R. Kampf; Email: akampf@nhm.org
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Abstract

The new mineral zincostottite (IMA2024-024), ZnGe(OH)6, was found on specimens from the Tsumeb mine, Tsumeb, Namibia, where it is a secondary oxidation-zone mineral. It occurs as heavily etched remnants of equant or tabular crystals, up to ∼1 mm in diameter. Crystals are colourless and transparent, with vitreous to subadamantine lustre and a white streak. The mineral is brittle with irregular stepped fracture. The Mohs hardness is ∼4.5. Cleavage is good on {100} and poor on {001}. The calculated density is 3.834 g·cm–3. Optically, zincostottite is uniaxial (–) with ω = 1.785(5) and ε = 1.765(5) (white light). The empirical formula is (Zn0.77Fe3+0.23)Σ1.00Ge1.00O6H5.77. Zincostottite is tetragonal, space group P42/n, with cell parameters: a = 7.4522(18), c = 7.4000(8) Å, V = 411.0(2) Å3 and Z = 4. The crystal structure (R1 = 2.65% for 452 I > 2σI reflections) is the same as that of stottite with Zn in place of Fe2+

Keywords

zincostottitenew mineralstottitecrystal structureRaman spectroscopyTsumeb mineTsumebNamibia

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Type
Article
Information
Mineralogical Magazine , Volume 89 , Issue 2 , April 2025 , pp. 266 - 271
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland.

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Footnotes

Associate Editor: Peter Leverett

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