; Epidote's chemical formula is: Ca2(Fe+++,Al)3(SiO4)3(OH) Epidote is found in Metamorphic deposits, it is composed primarily of iron, silica and calcium. The name of the mineral "Epidote" is from a Greek word "epidosis", which means "addition". * Epidote has no commercial uses, other than mineral collectors or perhaps as a gem in jewelry. *Source - Webmineral.Com