semibright

No.39 coal is one of high-metamorphism anthracite with black color and near-metallic luster in which semibright coal and semidull coal are dominant lithetype and there is a little dull coal.

大田水井坑井田39号煤层属高变质无烟煤,灰黑色至黑色为主,似金属,宏煤岩类型以亮型和暗型为主,少量为暗淡型;