polymnite
Pol"ym*nite, n. Etym: [Gr. (Min.) Defn: A stone marked with dendrites and black lines, and so disposed as to represent rivers, marshes, etc.
Pol"ym*nite, n. Etym: [Gr. (Min.) Defn: A stone marked with dendrites and black lines, and so disposed as to represent rivers, marshes, etc.