dice coal

dated uncountable

(dated) A kind of coal that easily splits into cubical fragments.

Japanese Meaning

容易に角状（サイコロ状）の断片に割れる性質を持つ石炭

The old miner claimed that the stove burned hotter when fueled with dice coal.

古い鉱夫は、炉に立方形に割れやすい石炭を入れるとより高温で燃えると主張していた。

Sense（1）

(dated) A kind of coal that easily splits into cubical fragments.

Rhomboidal coal (commonly called dice coal), in contradistinction to coals which do not break in rhombs.