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A crystallographic study of the incomplete solid-solution between plumbojarosite and jarosite

Laurel C. Basciano and Ronald C. Peterson
A crystallographic study of the incomplete solid-solution between plumbojarosite and jarosite
The Canadian Mineralogist (June 2010) 48 (3): 651-659

Abstract

An incomplete solid-solution series exists between jarosite, KFe (sub 3) (SO (sub 4) ) (sub 2) (OH) (sub 6) , and plumbojarosite, Pb[Fe (sub 3) (SO (sub 4) ) (sub 2) (OH) (sub 6) ] (sub 2) , on the basis of experimental data and the observed chemical variations of these minerals in nature. Samples were synthesized in a chloride-rich solution at 140 degrees and 110 degrees C and studied using X-ray powder diffraction, Rietveld analysis and chemical analysis. Under these conditions, plumbojarosite will only precipitate if the solution has a high concentration of Pb, 99 mol.% Pb. Only jarosite forms from solutions with up to 79 mol.% Pb in the starting solution. At 85 mol.% Pb in the solution, both jarosite and plumbojarosite precipitate. At the conditions of synthesis, Pb substitution into jarosite is extremely limited, with occupancy of 2% in the potassium site. Increased Pb in the starting solution resulted in no increased substitution of Pb into jarosite, but an increased substitution of H (sub 3) O (super +) into the structure. An increase in charge due to Pb (super 2+) substitution at the A site causes a charge imbalance in the structure. Potassium substitution into plumbojarosite is more extensive, K/(Pb+K)=32%. Potassium substitution preferentially occurs in one of the two symmetrically distinct A-sites, based on a Rietveld refinement of site populations.


ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 48
Serial Issue: 3
Title: A crystallographic study of the incomplete solid-solution between plumbojarosite and jarosite
Affiliation: Queen's University, Department of Geological Sciences and Geological Engineering, Kingston, ON, Canada
Pages: 651-659
Published: 201006
Text Language: English
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 24
Accession Number: 2010-080791
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Association of Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201043
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