夾炭層の構成鉱物について

日炭高松砿業所におけるボタの構成鉱物

抄録

Preliminary petrographical and mineralogical investigations of so called “Chiyoda bota” associated with the coal beds of the Onga formation, Ôtsuji group (Palaeogene) at the Takamatsu coal mine in the Chikuho coal-field are presented. The results of x-ray powder analyses as well as chemical, petrographical and differential thermal investigations the minerals and clay materials separated from them show that the shales are composed of halloysite with very low crystallinity and a small amounts of illite, quartz, feldspar, etc.