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Wroewolfeite, a new copper sulphate hydroxide hydrate

  • Pete J. Dunn (a1) and Roland C. Rouse (a1)

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.

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References

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Appleman, (D. E.), Evans, (H. J. Jr.), and Handwerker, (O. S.), 1972. JOB 9214; Indexing and least squares refinement of powder diffraction data. U.S. Geological Survey Computer Contr. 20: Springfield, Virginia, National Technical Information Service.
Emerson, (B. K.), 1917. U.S. Geol. Surv. Monograph, 29, 502.
Fraser, (J.), Fitzgerald, (R.), and Reid, (A. M.), 1966. Computer programs EMX and EMXZ for electron microprobe data processing. Unpubl. Report, Scripps Institute of Oceanography, Ref. :#66-14.
[Komkov, (A. I.) and Nefedov, (E. I.)] Komkob (A. И.) и HeΦeдoB (E. И.) 1967. 3aп. Bcecoio3. MИH. o6Щ. (Mem. All-Union Min. Soc.) 96, 5862 [M.A. 18-285].
Meixner, (H.), 1941. Zentr. Min., Abt. A, II [M.A. 8-381].
Pierrot, (R.) and Sainfeld, (P.), 1958. Bull. Soc. Franç. Min. Crist. 81, 257 [M.A. 14-413].
Silliman, (H.), 1810. Amer. Journ. Sci. 2, 63.
Strunz, (H.), 1970. Mineralogische Tabellen, 5th edn, 292-7.
Wappler, (G.), 1971. Ber. deutsch. Ges. geol. Wiss., ser. B, 16, 175.

Wroewolfeite, a new copper sulphate hydroxide hydrate

  • Pete J. Dunn (a1) and Roland C. Rouse (a1)

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