Ferrocalcite
Pronunciation : Fer`ro*cal"cite
Part of Speech : n.
Etymology : [Ferro- + calcite.]
Definition : Defn: Limestone containing a large percentage of iron carbonate, and hence turning brown on exposure.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder