福島縣小野新町附近に産出する蛭石ついて
1955 年 39 巻 2 号 p. 76-87
詳細
1955 年 39 巻 2 号 p. 76-87
The vermiculite occured in neighbours of Ononii-maehi, Fukushima Prefecture was produced by alteration of the biotite, one of the constituent minerals of hornblende-biotite-granite. The vermiculite has a characteristic features to compare with foreign one. Namely SiO2, Fe2O3 and CaO are much more contents. But MgO and H2O are very little. This vermiculite was produced by metamorphism of biotite that FeO changes to Fe2O3 and it caught a large quantity of the secondary water of crystallization.
