
1) Charcoal 2) Charcoal 3) Writing implement
Found on
https://www.crosswordclues.com/clue/fusain

Fusain is a fossilised carbon deposit, which - after some controversy - has been identified as fossilised charcoal. It is fibrous, black and opaque, and often preserves details of cell wall architecture. Wood-derived fusain usually takes the form of cubic blocks, whereas fusain from other plant material may take the form of thin films which are on...
Found on
http://en.wikipedia.org/wiki/Fusain

fine charcoal used in drawing
Found on
http://phrontistery.info/f.html

• (n.) Fine charcoal of willow wood, used as a drawing implement. • (n.) A drawing made with it. See Charcoal, n. 2, and Charcoal drawing, under Charcoal.
Found on
http://thinkexist.com/dictionary/meaning/fusain/

(from the article `coal`) ...Durain is thought to have formed in peat deposits below water level, where only liptinite and inertinite components resisted decomposition and ...
Found on
http://www.britannica.com/eb/a-z/f/72
Fu'sain' noun [ French, the spindle tree; also, charcoal made from it.]
(Fine Arts) (a) Fine charcoal of willow wood, used as a drawing implement.
(b) A drawing made with it. See
Charcoal ,
noun 2, and
Charcoal drawing , under
Cha...
Found on http://www.encyclo.co.uk/webster/F/89
a fine charcoal used in drawing, made from the wood of the spindle tree. · a drawing made with this charcoal. · a blackish-gray, friable component of coal with a silky luster that leaves a charcoallike mark.
Found on https://www.infoplease.com/dictionary/fusain
No exact match found.