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Mineralogical ClassificationRedefinition of zdenekite crystallography
28th Nov 2003 13:05 UTCUwe
space group P21/n, a = 10.023(7), b = 19.55(1), c = 10.023(6) A, beta =90.02(1)°, Z = 4.
The structure is closely related to that of lavendulan (P21/n), sampleite (P21/n) and the P21/c-polymorph of sampleite (paper in prep.).
Ref.
N. V. Zubkova, D. Yu. Pushcharovsky, H. Sarp, S. J. Teat, and E. J. MacLean (2003): Crystal structure of zdenekite NaPbCu5(AsO4)4Cl.5H2O. Crystallography Reports, 48, 939-943.
28th Nov 2003 14:15 UTCMarco Ciriotti
So the orthorhombicity of lavendulan and sampleite is not correct.
And in the lavendulan group they are two "subgroup unit" : monoclinic (lavendulan, sampleite, P21/c polymorph of sampleite, with Z = 4) and tetragonal (mahnertite and lemanskite, with Z = 8).
Shubnikovite (space group unknown) may be a related phase?
28th Nov 2003 14:35 UTCUwe
The status of this species is critically discussed in our to-be-submitted paper on lavendulan etc.
Cheers, Uwe
28th Nov 2003 15:01 UTCMarco Ciriotti
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