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The material in this section has been condensed from a more extensive summary which Dr. Kracek completed shortly before his death in 1960. Most of the data which have been omitted dealt with elements which are of little geologic interest, although in a few cases systems were discarded because it was believed that the results were of insufficient reliability or because conditions such as partial pressure of oxygen were unspecified. Certain binary systems, for example Al2 O3 –MgO, have not been included as such because all available information is given in the figure showing liquidus relations in a ternary system, in this case Al2O3­MgO­SiO2. Hydrous minerals, carbonates, and sulfide minerals are covered elsewhere in this Handbook, as are investigations above atmospheric pressure.

Systems are arranged in the following groups in the following order: systems involving a single metal ion; binary systems not involving SiO2 ; binary silicate systems; ternary systems; and quaternary and quinary systems. The arrangement is alphabetical within each group.

Temperatures are given without the degree mark, and any number not otherwise identified denotes the temperature in degrees Centigrade. The temperature scale used is not generally specified, although workers at the Geophysical Laboratory use the Day-Sosman scale of 1912, and recent work elsewhere (mostly at the National Bureau of Standards and Pennsylvania State University) has been based on the International Temperature Scale of 1948. The difference between the two

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