35. The origin
Fusain has been described by various workers as a black, dull, fibrous, friable charcoal-like material which readily breaks down to dust and exhibits a cellular structure when examined microscopically. According to White (1926, p. 267) fusain or as it has been known to others; mother of coal, mineral charcoal, carbonized wood, fusit, or faserkohle is composed of all kinds of woody material and occurs in post-Devonian coals and in sediments of all kinds.
Proceedings of the Iowa Academy of Science
©1952 Iowa Academy of Science, Inc.
"The Origin of Fusain,"
Proceedings of the Iowa Academy of Science, 59(1), 296-301.
Available at: https://scholarworks.uni.edu/pias/vol59/iss1/35