1.池島炭中のNa鉱物

抄録

Plagioclase, analcime, paragonite and illite/smectite mixed layer are found as Na-bearing minerals in the Ikeshima coals. Analcime and paragonite are formed in the fissures and pores in relatively low ash coals. Na content is well correlated with ash content. Na in high ash coals and related sediments mainly depends on plagioclase and Na in low ash coals on analcime, paragonite and plagioclase.