13 letters · 22 points in Scrabble
noun a mineral consisting of manganese carbonate; a source of manganese
originFrom Ancient Greek ῥοδόχρως (rhodókhrōs, “having rosy colour”), from ῥόδον (rhódon, “rose”) + χρώς (khrṓs, “colour”).
Etymology from Wiktionary, CC BY-SA 3.0