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Crystallogenesis and Mineralogy
Saint Petersburg, Russia
1-5 October 2007
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Conferences & Meetings 2nd International Conference "Crystallogenesis and Mineralogy"
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Selenites and sulphates: system Ni2+, Co2+ // SeO3 2-, SO4 2- - H2O. Thermodynamical analysis and geological applications

RMS-DPI code:  2007-1-130-0
Scientific session:  Session 5. Crystal chemistry and crystal morphology of minerals
Author listing:  Krivovichev V.G., Charykova M.V., Depmeier W.
Principal author:  Krivovichev Sergey
Language:  Russian
Abstract - Summary 
(short description):
Due to the toxicity of selenium it is quite essential to analyze theconditions under which selenites and selenates replace selenides in the oxidation zones of sulfide ore deposits and upon weathering of technologic waste. This purpose is performed by summarizing in Eh-pH diagrams the results of calculations of equilibrium, and considering geologic occurrences. It is the purpose of this work to consider the manner of occurrence and the behavior of selenium during crystallization and dilution of selenites (chalcomenite, ahlfeldite, and cobaltomenite) and sulpates (chalcanthite, bieberite, and morenosite) in order to interpret conditions of formation of these minerals and to compare their geologic stabilities in low-temperature conditions. The interpretations are summarized on the diagrams, synthesized from equilibrium calculations of the mineral solubility in the systems Cu2*, Ni2*, Co2* // SeO,2, SO42 - H2O (including five subsystems: Ni2+, Co2* // SeO,2, SO42 - H2O; Cu2*, Co2+ // SeO,2, SO42 - H2O; Cu2*, Ni2* // SeO,2, SO42 - H20; Cu2+, NP, Co2+ // SeO,2 - H20, and Cu2*, Ni2+, Co2* // SO,2 - H2O), and reported geologic occurrences. The most recent thermodynamic data available were used for the construction of diagrams from reactions which are balanced equations among species which are thermodynamically stable within the ranges of conditions considered for each reaction.
 
RMS-DPI code:  2007-1-130-0
Proceeedings volume 
in the RMS catalogue:
 
Crystallogenesis and Mineralogy
Pages:  285-287
File of proceedings 
(PDF): 
 287 K
Status:  printed
Accepted:  23/08/2007
Published on-line:  06/01/2008
Permanent address of publication:  http://www.minsoc.ru/2007-1-130-0/
Contact author(s):  Krivovichev, Sergey
 
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