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Chloritoid is a silicate mineral of Metamorphism origin. It is an iron magnesium manganese alumino-silicate hydroxide with formula . It occurs as greenish grey to black platy 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. It typically occurs in , and .
Both monoclinic and triclinic polytypes exist and both are pseudohexagonal. Handbook of Mineralogy Mindat
It was first described in 1837 from localities in the Ural Mountains region of Russia. It was named for its similarity to the chlorite group of minerals. Webmineral data
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