温石綿の化学組成について

概要

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Chemical compositions, physically adsorbed waters and hydroxyl contents were measured for 14 chrysotiles, which were selected from main chrysotile deposits of the world, and which contain less amounts of impurity minerals. Before chemical analysis the samples were refined to reduce impurities. It was revealed that chrysotile contains less than 2.5% of Al_2O_3+Fe_2O_3+FeO, and in these oxide the relation of Fe_2O_3>Al_2O_3 in recognized for chrysotile compared with the relation of Fe_2O_3<Al_2O_3 for antigorite, and FeO/(Fe_2O_3+FeO)>0.1 for chrysotile compared with FeO/(Fe_2O_3+FeO)<0.1 for lizardite and 6-layer serpentine. The content of SiO_2 and MgO were also close to the theoretical value of chrysotile, but the contents of octahedral ions were slightly higher than tetrahedral ions. The amounts of physically adsorbed H_2O were between 0.49% and 0.89% and also contained less than 0.7% of chemically combined excess water. The correlation between the softness of chrysotile and chemical composition was confirmed in Al_2O_3 content but not in chemically combined water.
日本粘土学会の論文
1975-02-25