mountain soap

== English == === Noun === mountain soap (uncountable) (possibly obsolete) A soft earthy mineral, of a brownish colour, which has a greasy or soapy feel and is used as a filler in crayons. ==== Synonyms ==== rock soap saponite === References === “mountain”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC. “mountain soap”, in OneLook Dictionary Search.