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Phenomena related to the solubility of solids, liquids, and gases with one another are of interest to scientists and technologists in an array of disciplines. The diversity of backgrounds of individuals concerned with solubility creates a potential for confusion and miscommunication and heightens the need for an authoritative glossary of terms related to solubility. This glossary defines 166 terms used to describe solubility and related phenomena. The definitions are consistent with one another and with recommendations of the International Union of Pure and Applied Chemistry for terminology and nomenclature.

picture of the solid state equilibria is in agreement with the experimental results obtained by Johnson and Muan [5] at 1500 °C, either in air or at low oxygen pressure [F (0 2) = 10~9 atm]. Figure 4 shows the (composition, temperature) diagram of the binary Ca, Mg/O, and the thick lines (either solid or dashed) simply show on different coordinates the regular solution results above dis­ cussed. For the latter binary, we worked out also a more accurate free energy model to fit the available experimental data [6] (the details of the procedure are reported in the

, a fortran crystallographic least squares program. Oak Ridge Nat. Lab., Oak Ridge, Tennessee (1962) Cradwick, M. E., Taylor, H. F. W.: The crystal structure of Na2Mg2Si6015. Acta Crystallogr. B28, 3585-3587 (1972) 304 M. Kimata: The structural properties of synthetic Sr-akermanite, Sr2MgSi207 Dear, P. S.: X-ray diffraction data for silicates, aluminates, and alumino-silicates or strontium. — Bulletin of the Virginia Polytechnic Institute, Enginnering Experiment Station Series No. 117, 50 (6), 1-15 (1957) Dear, P. S.: Solid state equilibria for the ternary system

directly from measuring EMF of the cell (A) using thermodynamic data for Ag2S only. Using additional data for temperature dependence of the free energy of formation of argentite from silver and S2(g) from Richardson and Jeffes (1952) ∆Gf(Ag2S, cr) = –87 822 + 34.56⋅T, J/mol (7) we obtain the equation logfS2 = (–9174.5 + 20.159⋅E/mV)⋅T–1 + 3.61 (8) which in this temperature interval practically coincides with the newer data from Barin (1995), Robie and Hemingway (1995), and applicable for studying any sulfide solid-state equilibria involving Ag2S. experimentAl

and Petrology, 138, 35–45. Arlt T Kunz M Stolz J Armbruster T Angel J.R 2000 P - T - X data on P 21/ c -clinopyroxenes and their displacive phase transitions Contributions to Mineralogy and Petrology 138 35 45 Atlas, L. (1952) The polymorphism of MgSiO 3 and solid-state equilibria in the system MgSiO 3 -CaMgSi 2 O 6 . Journal of Geology, 60, 125–147. Atlas L 1952 The polymorphism of MgSiO 3 and solid-state equilibria in the system MgSiO 3 -CaMgSi 2 O 6 Journal of Geology 60 125 147 Bowen, N.L., and Schairer, J.F. (1935) The system, MgO-FeO-SiO 2 . American

Station Series No. 117, 50 (6), 1 - 1 5 (1957) Dear, P. S. : Solid state equilibria for the ternary system strontia-magnesia-silica. Ibid. 54(1). 1 - 10 (1960) Dear, P. S.: Isomorphism ofgehlenite and strontio-gehlenite. Ibid. 54(7), 1 - 1 1 (1961) Dear, P. S.: Isomorphism ofakermanite and strontio-gehlenite. Lithos, 3, 13 — 16 (1969) Ervin, G., Osborn, E. F. : X-ray data on synthetic melilites. Am. Mineral. 34, 717 - 722 (1949) Eskola, Pentti: Silicates of strontium and barium. Am. J. Sci., 5th Series, 4, 336 (1922) Fitton, J. G., Hughes, D. J.: Stontian

situation may also rationalize the fact that the proto structure occurs only at the Mg corner of the pyroxene quadrilateral. Acknowledgement. We are grateful to the late Dr. Jun Ito for putting his synthetic crystals of orthoenstatite at our disposal, to Dr. K. Ohsumi and Dr. T. Sawada for their help at early stage of our experiment with the use of C02 laser, and to Dr. H. Takeda for discussion. References Atlas, L.: The polymorphism of MgSi03 and solid-state equilibria in the system MgSi03 —CaMgSi206. J. Geol. 60, 125-147 (1952) Brown, W. L., Smith, J. V.: High

(no. 06402019) from the Ministry of Education, Science and Culture of the Japanese Government. REFERENCES CITED Atlas, L. (1952) The polymorphism of MgSiO3 and solid-state equilibria in the sys- tem MgSiO3-CaMgSi2O6. Journal of Geology, 60, 125–147. Anderson, O.L., Isaak, D.G., and Yamamoto, S. (1989) Anharmonicity and the equa- tion of state for gold. Journal of Applied Physics, 65, 1534–1543. Angel, R.J. and Hugh-Jones, D.A. (1994) Equations of state and thermodynamic properties of enstatite pyroxenes. Journal of Geophysical Research, 99, 19777– 19783. Angel, R

-mantle pressures. Nature, 358, 322–324. Arlt, T. and Armbruster, T. (1997) The temperature-dependent P21/c-C2/c phase transition in the clinopyroxene kanoite MnMg[Si2O6]: a single-crystal X-ray and optical study. European Journal of Mineralogy, 9, 953–964. Arlt, T., Kunz, M., Stolz, J., Armbruster, T., and Angel, R.J. (2000) P-T-X data on P21/c-clinopyroxenes and their displacive phase transitions. Contributions to Mineralogy and Petrology, 138, 35–45. Atlas, L. (1952) The polymorphism of MgSiO3 and solid-state equilibria in the system MgSiO3-CaMgSi2O6. Journal of Geology

work was partially supported by a Grant-in-Aid for Scientifi c Research from the Ministry of Education, Science, Sports, and Culture in Japan and by a Grand-in-Aid for the 21st Century COE program (Kyoto University, G3). REFERENCES CITED Atlas, L. (1952) The polymorphism of MgSiO3 and solid-state equilibria in the system MgSiO3-CaMgSi2O6. Journal of Geology, 60, 125–147. Biggar, G.M. (1985) Calcium-poor pyroxenes: Phase relations in the system CaO- MgO-Al2O3-SiO2. Mineralogical Magazine, 49, 49–58. Boyd, F.R. and Schairer, J.F. (1964) The system MgSiO3-CaMgSi2O6