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A Method for Thermodynamical Calculation of Basicity Indicators of Rocks and Minerals

Authors:	MARAKUSHEV A A

Institution:	The Institute of Experimental Mineralogy 142432 Chernogolovka, Moscow Region, U.S.S.R.

Abstract:	A new method has been suggested for evaluating the overall basicityof minerals and rocks by using ionization reactions involvingone proton: (sum of cations) + $1/2$ H₂O = mineral + H⁺, (sum of cations) + $1/2$ H₂O = (sum of normative minerals of a rock)+ H⁺. The basicity indicators are expressed as standard free energychanges of these reactions ( ${Delta}$ ). At standard water pressure (logP_H₂_O = 0) and chemical activity of the metal ions ( ${Sigma}$ log ${alpha}$ _Mⁿ⁺= 0), the relationship between ${Delta}$ and alkalinity of solutions(pH) becomes: ${Delta}$ = –2.303 RTlog ${alpha}$ _H⁺ = 2.303 RT pH. The overall basicities of rock-forming oxides, minerals andmajor rocks were calculated from the thermodynamic data on ionsin water solutions and solid compounds.

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