Chert
Mentioned in Witches Abroad and Troll Bridge, this troll works at (or possibly runs) a sawmill in Sour Water, and sells coffins at a good price. He employs his brother, Mica, part-time.
A Constable Chert is also mentioned in The Fifth Elephant.
References the Roundworld rock chert. Also see the Shorter Oxford Dictionary; a flint- like quartz.
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