日本炭の分類における問題点
日本炭の顕微鏡的研究第I報
1956 年 65 巻 1 号 p. 33-45
詳細
1956 年 65 巻 1 号 p. 33-45
The “degradinite” is much discussed in relation to the petrographical classification for our tertiary coal. The microscopical nature of “degradinite” is the same as that of R. Thiessen's “humic degradation matter”, which is correlated to a part of “collinite” in the european coal petrographical classification. Therefore the category of “degradinite” is also included in that of “collinite”. I should like to provisionally adopt “degradinite” as the term for the ground-mass or matrix of our coal, because the modes of appearance of “collinite” under the microscope are changed by different conditions of observation (transmitted light, reflected light : dry or oil immersion system). Accordingly our dull coal does not come under the category of “durite”.
