Tags: Chemical Substance, Mineral.
Chloritoid is a silicate mineral of metamorphic origin. It is an iron magnesium manganese alumino-silicate hydroxide with formula: (FeMgMn)2Al4Si2O10(OH)4. It occurs as greenish grey to black platy micaceous crystals and foliated masses. Its Mohs hardness is 6.5 unusually high for a platy mineral and it has a specific gravity of 3.52 to 3.57.
