Abstract
Glaucophane problem, that is the origin of glaucophane schists has come recently to be one of the most important and attractive problems in petrology in the world. Here, (1) the mineralogical, petrographical and chemical properties of the glaucophane schists and (2) the historical outline of the investigation of glaucophane schists during the past one hundred years will be briefly described. It is pointed out that the hypothesis of “glaucophane schist facies” proposed by P. Eskola in 1929_??_ and 1939 has been recently proved through the geological and petrological studies on glaucophanitic regional metamorphic terrains in Corsica, Celebes and Japan and the experimental and thermodynamic studies performed by American petrologists during the past ten years.
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