Bulletin . We have here evidently mixtures of albite and anor-thite, and on fusing a series of these mixtures it was foundthat they proved to be a series of solid solutions whose *Day and Allen. The Isomorphism and Thermal Properties of theFeldspars, Carnegie Inst., 1905. IN THE POROSITY AND THE SPECIFIC GRAVITY OF SOME AJLIAV^g D(zllD3d9 18 THE INFLUENCE OF FLUXES AND NON-FLUXES UPON THE CHANGES melting points changed in almost linear relation to thepercentage composition of the two silicates. From thisresult Day and Allen conclude that the triclinic feldsparsform together an isomorph
Bulletin . We have here evidently mixtures of albite and anor-thite, and on fusing a series of these mixtures it was foundthat they proved to be a series of solid solutions whose *Day and Allen. The Isomorphism and Thermal Properties of theFeldspars, Carnegie Inst., 1905. IN THE POROSITY AND THE SPECIFIC GRAVITY OF SOME AJLIAV^g D(zllD3d9 18 THE INFLUENCE OF FLUXES AND NON-FLUXES UPON THE CHANGES melting points changed in almost linear relation to thepercentage composition of the two silicates. From thisresult Day and Allen conclude that the triclinic feldsparsform together an isomorphous series. This relation isbrought out clearly by the curve of Fig. 1, in which therate of change in the specific gravity of mixtures betweenthe anorthite and albite is shown to be a linear tends to show that we are dealing here with isomor-phous mixtures and at the same time explains why theyhave no definite melting points. Albite was proven to meltthrough a range of about 150^. Although the meltingpoint of the average feldspar as used in the industries isabout at cone 8, yet its interaction with clay substancebegins at a much lower temperature. Berdel found thatthe dissolving action of orthoclase feldspar began as lowas cone 09. On fusing mixtures of the trilinic feldspars it wasfound that their melting
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