In:
Mineralogical Magazine, Mineralogical Society, Vol. 81, No. 1 ( 2017-02), p. 123-134
Abstract:
Natural samples of the substituted basic Cu(II) chloride series, Cu 4–x M x 2+ (OH) 6 Cl 2 ( M = Zn, Ni, or Mg) were investigated by single-crystal X-ray diffraction in order to elucidate compositional boundaries associated with paratacamite and its congeners. The compositional ranges examined are Cu 3.65 Zn 0.35 (OH) 6 Cl 2 – Cu 3.36 Zn 0.64 (OH) 6 Cl 2 and Cu 3.61 Ni 0.39 (OH) 6 Cl 2 – Cu 3.13 Ni 0.87 (OH) 6 Cl 2 , along with a single Mg-bearing phase. The majority of samples studied have trigonal symmetry ( R 3̄ m ) analogous to that of herbertsmithite (Zn) and gillardite (Ni), with a ≈ 6.8, c ≈ 14.0 Å. Crystallographic variations for these samples caused by composition are compared with both published and new data for the R 3̄ m sub-cell of paratacamite, paratacamite-(Mg) and paratacamite-(Ni). The observed trends suggest that the composition of end-members associated with the paratacamite congeners depend upon the nature of the substituting cation.
Type of Medium:
Online Resource
ISSN:
0026-461X
,
1471-8022
DOI:
10.1180/minmag.2016.080.079
Language:
English
Publisher:
Mineralogical Society
Publication Date:
2017
detail.hit.zdb_id:
2034522-7
SSG:
13
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