By Toshio Sudo
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S. 35*** 0,s. S. 52 . 60 I I IS. 02 blue No. 018** 6-1) and 9-1) Unoxidized samples. 6-2), 9-2) and 10-2) Oxidized samples. *Iron-saponite. **Iron-bearing montmorillonite/beidellite. ***6-1’ (Fig. 1-13). 012** CLAYS AND CLAY MINERALS 47 ,,Al, Oya-material W l 6 7 (Mg,Fei+) (Si, 67) O,,(OH), The data strongly suggest the existence of an iron analog of saponite (an endmember) having the following ideal chemical formula : In the diagram showing the relationship between the total Fe and Mg content in the octahedral sheet (per unit structure) and the 6-parameter (Fig.
EG: Treatment with ethylene glycol. Tg: Anticathode. 42 OUTLINE spread occurrence of iron-saponite in the Green Tuff of the Tanzawa Mountains. The assignment of the DTA peaks of the iron-saponite has not been fully established. An additional small endothermic peak at 500-600” C and also an apparent doubling of dehydroxylation peak may be attributed to a “chloritized effect” as suggebted by Mackenzie (1957) (Fig. 10). I 1 1 I I I I I 100 200 300 400 500 600 700 800 I 900 1000 Temp. (“C) Fig. 10.
6. Weathering zones and soils Due to the widespread occurrence of volcanic ash, pumice beds and glassy tuffs in Japan, studies on the clay minerals of the weathering zones and soils derived from them are particularly important. Seki (1913, 1928) reported the presence of allophane in various volcanic ash soils in Japan, and clarified its general properties. Later, the clay mineralogy of allophane and halloysite was summarized by Ross and Kerr (1934). In about 1954, active work on allophane and related materials was initiated in Japan, as well as in certain other countries such as New Zealand (Sudo, 1954; Fieldes, 1957).
Clays and Clay Minerals of Japan by Toshio Sudo