Answer: chlorite

AnswerCrossword Clue
CHLORITEGreen stone
chloritesalt of chlorous acid, as potassium chlorite, KClO2
chloritea mineral group
chloriteany of a group of usually green silicate minerals associated with and resembling the micas
chloritegroup of minerals, hydrous silicates of aluminum, ferrous iron, and magnesium, occurring in green platelike crystals or scales