In this environment chlorite may be a retrograde metamorphic alteration mineral of existing ferromagnesian minerals .
Alteration mineral may be present as a metasomatism product via addition of Fe , Mg , or other compounds into the rock mass .
In this environment chlorite may be a retrograde metamorphic alteration mineral of existing ferromagnesian minerals , or it may be present as a metasomatism product via addition of Fe , Mg , or other compounds into the rock mass .