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Wroewolfeite, a new copper sulphate hydroxide hydrate

Published online by Cambridge University Press:  05 July 2018

Pete J. Dunn  and
Roland C. Rouse
Pete J. Dunn
Affiliation:
Department of Mineral Sciences, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560
Roland C. Rouse
Affiliation:
Department of Mineral Sciences, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560
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Summary

Wroewolfeite is a new mineral from the Loudville lead mine in Loudville, Massachusetts, U.S.A. The mineral occurs as blue, monoclinic crystals, twinned on {001}, very similar in appearance to posnjakite and langite. It is formed as small isolated pinacoidal crystals (up to 1.0 mm) implanted on covelline and chalcosine. There are three cleavages of equal facility of production. The cell dimensions are a 6.058 Å, b 5.654 Å, c 14.360 Å, β 93° 28′, space group Pc or P2/c. The strongest diffraction lines (in Å) are 7.152 (100), 3.581 (70), 2.628 (35), 2.004 (30), 2.431 (20), 2.379 (20), 2.278 (20). Electronmicroprobe analysis gives CuO 64.22 %, SO3 16.48 %, water by difference 19.30 %. Empirical cell contents are Cu7.88(SO4)2.00(OH)11.76.(H2O)4.22 or Cu4(SO4)(OH)6.2H2O with Z = 2. Wroewolfeite is strongly pleochroic with a light blue, β deep greenish blue, and γ, medium greenish blue. Absorption β > γ ≫ α. The mineral is biaxial with α 1.637, β 1.682, and γ 1.694, 2Vα = 53° The name is for C. Wroe Wolfe, American crystallographer, educator, and philosopher.

Type
Research Article
Information
Mineralogical Magazine , Volume 40 , Issue 309 , March 1975 , pp. 1 - 5
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1975

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References

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