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Chloritoid is a silicate mineral of metamorphic origin. It is an iron magnesium manganese alumino silicate hydroxide with formula: (Fe,Mg,Mn)2Al4Si2O10(OH)4. It occurs as greenish grey to black platy micaceous triclinic crystals and foliated masses. The Mohs hardness at 6.5 is unusually high for a platy mineral and it has a specific gravity of 3.52 to 3.57. It typically occurs in phyllites, schists and marbles.

Additional recommended knowledge

It was first described in 1837 from localities in the Ural Mountains region of Russia.


  • Webmineral data
  • Mindat
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Chloritoid". A list of authors is available in Wikipedia.
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