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Drugmanite, Pb2(Fe3+,Al) (PO4)2(OH) · H2O, a new mineral from Richelle, Belgium

Published online by Cambridge University Press:  05 July 2018

R. Van Tassel ,
A.-M. Fransolet  and
K. Abraham
R. Van Tassel
Affiliation:
Institut royal des Sciences naturelles de Belgique, BrusselsBelgium
A.-M. Fransolet
Affiliation:
Institut de Minéralogie, Université de Liège, Liège, Belgium
K. Abraham
Affiliation:
Institut für Mineralogie, Ruhr-Universität, Bochum Federal Republic of Germany
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Summary

Drugmanite occurs as rare colourless transparent platy crystals, up to 0.2 mm, aggregated in bunches, in vugs of a mineralized and silicified limestone. Hardness < 6. Crystals monoclinic, forms {001} {110}, parameters from indexed X-ray powder pattern (and monocrystal measurements): a = 11.110 (11.111) Å, b = 7.976 (7.986), c = 4.644 (4.643), β = 90°18′ (90°.41°). Space group P21/a with Z = 2 giving Dcalc = 5.55. Strongest lines are 4.63 Å (9), 3.752 (IO), 3.350 (8), 3.247 (8), 2.912 (9). Mean refractive index 1.88 from reflectance measurements. Strong dispersion r < v, optic axial plane // (olo), 2Vα = 33±2°. Electron microprobe analysis gave P 8.89, Al 0.85, Fe 6.19, Pb 59.76%, leading to Pb4.02 ( Al0.45)P4.00O17.02·3H2O or Pb2(Al0.22) (PO4)2 (OH)·H2O. Associated minerals are pyromorphite, anglesite, corkite and phosphosiderite. Named for J. Drugman, Belgian mineralogist (1875–1950).

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 328 , December 1979 , pp. 463 - 467
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1979

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