Definition of chloritoid
: a mineral (Mg1Fe)AlSiAlO5(OH)2 consisting of a silicate of aluminum and ferrous iron with magnesium occurring usually in dull green to gray or grayish black masses of brittle folia and related to the brittle micas (as clintonite)
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Origin and Etymology of chloritoid
German, from chlorit chlorite (mineral) + -oid
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