Brownish Mineral Commonly Used as Iron Ore
This page is the CodyCross answer for the clue below from Mexico, Group 1371, Puzzle 4 (Olmec and Maya).
Question is: Brownish Mineral Commonly Used as Iron Ore
and the answer is: LIMONITE
Word Meaning:
LIMONITE — (mineralogy) Any of several natural hydrous iron oxides; often a mixture of goethite and hematite with clays and manganese oxide.
Definitions from Wiktionary.