THE 



AMERICAN JOURNAL OF SCIENCE 



[FOURTH SERIES.] rc => 



* SEP 2 



Art. XL — Wollastonite (CaO.Si0 2 ) and related Solid 

 Solutions in the Ternary System Lime-Magnesia- 

 Silica; by J. B. Ferguson and H. E. Merwin. 



Contents. 

 Introduction. 

 Experimental Part. 

 Methods. 



Solid solutions of CaO.Si0 2 with Silica. 

 Solid solutions of CaO.SKX with 3Ca0.2Si0 2 . 



Experiments with the Pseudo wollastonite solid solutions. 

 Experiments with the Wollastonite solid solutions. 

 Solid solutions of CaO.Si0 2 with Diopside. 

 Solid solutions toward Akermanite. 

 Solid solutions between the Wollastonite-Diopside and the Wollastonite- 



Akermanite solid solutions. 

 The 5Ca0.2Mg0.6Si0 2 solid solutions. 

 Solid solutions with Akermanite and 3Ca0.2Si0 2 . 

 Discussion. 



Unstable phases. 

 Recapitulation. 



Introduction. 



In a previous paper 1 the general temperature-concen- 

 tration relations found in the ternary system "Lime- 

 Magnesia- Silica" have been given, and in this paper we 

 wish to present a particular discussion of the calcium 

 metasilicate and related solid solutions which could not 

 be adequately discussed in the more general paper. 



The accuracy and definiteness of a large part of the 

 work herein presented is much less than in the previous 

 work on account of the following causes: difficulty of 

 identifying certain phases not only because of fineness of 

 grain but also because of their great optical similarity; 



a This Journal, August number, 1919. 



Am. Jour. Sci.— Fourth Series, Vol. XL VIII, No. 285.— September, 1919. 

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