Thermodynamic mixing properties of Rb-K feldspars

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Thermodynamic mixing properties of Rb-K feldspars

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dc.contributor.author Roux, J.
dc.contributor.author Hovis, Guy L.
dc.date.accessioned 2010-01-08T16:15:36Z
dc.date.available 2010-01-08T16:15:36Z
dc.date.issued 2008
dc.identifier.citation Hovis, G. L., J. Roux. (2008). "Thermodynamic mixing properties of Rb-K feldspars." American Mineralogist 93: 1597-1602. en_US
dc.identifier.uri http://hdl.handle.net/10385/545
dc.description.abstract Hydrofluoric acid solution calorimetric measurements conducted at 50 °C on a series of Al-Si ordered Rb-K feldspars reveal that the enthalpies Rb-K mixing (Hex) for this series are positive, with maximum values skewed toward Rb-rich compositions. However, the magnitudes of Hex are greatly reduced relative to those for Na-K feldspars, as are the positive volumes of Rb-K mixing observed for this series. Both observations can be explained by the substitution of two ions that are relatively similar in size. The difficulty in synthesizing Rb-rich sanidine via Rb-exchange of K-sanidine, contrasted with the ability to synthesize rubicline from K-microcline by such exchange, together with a vanishingly small ΔV between ordered rubicline and disordered Rb-sanidine suggest that the volume of Rb-feldspar is close to the limit to which the feldspar structure can be expanded at 1 bar. en_US
dc.language.iso en_US en_US
dc.publisher American Mineralogist en_US
dc.subject mixing properties en_US
dc.subject thermodynamics en_US
dc.subject solution calorimetric data en_US
dc.subject Rb-K feldspars en_US
dc.title Thermodynamic mixing properties of Rb-K feldspars en_US
dc.type Article en_US
dc.identifier.doi 10.2138/am.2008.2791

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