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Schieffelinite, a new lead tellurate-sulphate from Tombstone, Arizona

Published online by Cambridge University Press:  05 July 2018

Sidney A. Williams
Sidney A. Williams*
Affiliation:
Phelps Dodge Corporation, Douglas, Arizona, USA
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Summary

Found at the Joe and Grand Central mines, Tombstone, Arizona, USA, in quartz gangue with girdite, rodalquilarite, bromargyrite, and gold. Crystals orthorhombic, tabular to scaly on {010} up to 1 mm; H = 2, colour white, Dmeas = 4.98 ± 0.12.

Chemical analysis gave PbO 58.2 %, TeO3 28.6, SO3 6.8, H2O 4.7. Easily fusible to red-brown slag and soluble in cold, dilute acids.

Crystals orthorhombic Cmcm; a = 9.67 Å, h = 19.56, c = 10.47. Strongest lines 9.778 (10), 3.426 (6), 3.250 (6B), 3.560 (5B), 3.338 (5), 3.033 (5), 2.934 (5), 2.603 (5). Dcalc = 5.15, Z = 16. Indices are α = 1.897, β = 1.940, γ = 1.942, 2Va = 24°; γ‖a, α‖b, β‖c.

The mineral and name have been approved by the Commission on New Minerals and New Mineral Names, IMA.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 330 , June 1980 , pp. 771 - 773
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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References

Dunham, (K. C.), 1935. N.M. School of Mines Bull. 11, 159-60.Google Scholar
Fairbanks, (E. E.), 1946. Econ. Geol. 41, 767.Google Scholar