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Thermal analysis of beaverite in comparison with plumbojarosite

By Ray L. Frost, Ashley J. Locke and Wayde N. Martens

Abstract

The thermal decomposition of beaverite and plumbojarosite was studied using a combination of thermogravimetric analysis coupled to a mass spectrometer. The mineral beaverite Pb(Fe,Cu)3(SO4)2(OH)6 decomposes in three stages attributed to dehydroxylation, loss of sulphate and loss of oxygen, which take place at 376 and 420, 539 and 844 degrees Celsius. In comparison three thermal decomposition steps are observed for plumbojarosite PbFe6(SO4)4(OH)12 at 376, 420 and 502 degrees Celsius attributed to dehydroxylation; loss of sulphate occurs at 599 degrees Celsius; and loss of oxygen and formation of lead occurs at 844 and 953 degrees Celsius. The temperatures of the thermal decomposition of the natural plumbojarosite were found to be less than that for the synthetic jarosite. A comparison of the thermal decomposition of plumbojarosite with argentojarosite is made. The understanding of the chemistry of the thermal decomposition of minerals such as beaverite, argentojarosite and plumbojarosite and related minerals is of vital importance in the study known as 'archeochemistry'

Topics: 030606 Structural Chemistry and Spectroscopy, 030600 PHYSICAL CHEMISTRY (INCL. STRUCTURAL), 030206 Solid State Chemistry, 030603 Colloid and Surface Chemistry, argentojarosite, beaverite, plumbojarosite, dehydration, dehydroxylation, thermogravimetric analysis
Publisher: Springer
Year: 2008
DOI identifier: 10.1007/s10973-007-8702-7
OAI identifier: oai:eprints.qut.edu.au:13514

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